AVCHD
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AVCHD (Advanced Video Coding High Definition)[1] is a file-based format for the digital recording and playback of high-definition video. It is H.264 and Dolby AC-3 packaged into the MPEG transport stream, with a set of constraints designed around camcorders.
Developed jointly by Sony and Panasonic, the format was introduced in 2006 primarily for use in high definition consumer camcorders.[citation needed] Related specifications include the professional variants AVCCAM and NXCAM.
Favorable comparisons of AVCHD against HDV and XDCAM EX[2][3] solidified perception of AVCHD as a format acceptable for professional use. Both Panasonic and Sony released the first consumer AVCHD camcorders in spring of 2007.[4] Panasonic released the first AVCHD camcorder aimed at the professional market in 2008, though it was nothing more than the (by then discontinued) FLASH card consumer model rebadged with a different model number.
In 2011 the AVCHD specification was amended to include 1080-line 50-frame/s and 60-frame/s modes (AVCHD Progressive) and stereoscopic video (AVCHD 3D). The new video modes require double the data rate of previous modes.
AVCHD and its logo are trademarks of Sony and Panasonic.[5]
Overview
[edit]
For video compression, AVCHD uses the H.264/MPEG-4 AVC standard, supporting a variety of standard, high definition, and stereoscopic (3D) video resolutions. For audio compression, it supports both Dolby AC-3 (Dolby Digital) and uncompressed linear PCM audio. Stereo and multichannel surround (5.1) are both supported.
Aside from recorded audio and video, AVCHD includes many user-friendly features to improve media presentation: menu navigation, simple slide shows and subtitles. The menu navigation system is similar to DVD-Video, allowing access to individual videos from a common intro screen. Slide shows are prepared from a sequence of AVC still frames, and can be accompanied by a background audio track. Subtitles are used in some camcorders to timestamp the recordings.
Audio, video, subtitle, and ancillary streams are multiplexed into an MPEG transport stream and stored on media as binary files. Usually, memory cards and HDDs use the FAT file system, while optical discs employ UDF or ISO 9660.
At the file system level, the structure of AVCHD is derived from the Blu-ray Disc specification, but is not identical to it. In particular, it uses legacy "8.3" file naming convention, while Blu-ray Discs utilize long filenames (this may be caused by the fact that FAT implementations utilizing long file names are patented by Microsoft and are licensed on a per unit sold basis[6]). Another difference is location of the BDMV directory, which contains media files. On a DVD-based camcorder the BDMV directory is placed at the root level, as on the Blu-ray Disc. On the HDD-based Canon HG10 camcorder the BDMV directory is located in the AVCHD directory, which is placed at the root level.[7] Solid-state Panasonic and Canon camcorders nest the AVCHD directory inside the PRIVATE directory.[8] Following a standard agreed upon by many still camera manufacturers, solid-state camcorders have a root-level DCIM directory for still images.[9]
AVCHD is compatible with the Blu-ray format [citation needed] and can be authored without re-encoding on Blu-rays or DVDs, though not all Blu-ray Disc players are compatible with AVCHD video authored on DVD media, a format known as AVCHD disc.
AVCHD recordings can be transferred to a computer by connecting the camcorder via the USB connection. Removable media like SDHC and Memory Stick cards or DVDs can be read on a computer directly. Copying files from an AVCHD camcorder or from removable media can be performed faster than from a tape-based camcorder, because the transfer speed is not limited by realtime playback.
Just as editing DVCPRO HD and HDV video once demanded an expensive high-end computer, AVCHD editing software requires powerful machines. Compared to HDV, AVCHD requires 2-4 times the processing power for realtime playback, placing a greater burden on the computer's CPU and graphics card. Improvements in multi-core computing and graphics processor acceleration bring AVCHD playback to mainstream desktops and laptops.
Video formats
[edit]AVCHD supports a variety of video resolutions and scanning methods, which was further extended with the 2011 amendment of the specification. The licensing body of the specification defines a variety of labels for products compliant with specific features.
Most AVCHD camcorders support only a handful of the video and audio formats allowed in the AVCHD standard.
Interlaced video
[edit]AVCHD supports both standard definition (AVCHD-SD) and high definition (AVCHD 1080i) interlaced video. AVCHD 1080i is available on most AVCHD camcorders. For some models this is the only recording mode offered.
AVCHD-SD is used in the shoulder-mount Panasonic HDC-MDH1,[10] as well as on its North American AG-AC7 cousin. A successor model – the AG-AC8, is also capable of recording in AVCHD-SD mode.[11] Several models from JVC like the consumer camcorders GZ-HM650, GZ-HM670 and GZ-HM690 as well as the professional camcorder JVC GY-HM70[12] can record AVCHD-SD video. AVCHD-SD is not compatible with consumer DVD players, because it employs AVC video encoding instead of MPEG-2 Part 2. AVCHD-SD can be played on a Blu-ray Disc player without re-encoding.
Interlaced video had been originally designed for watching on a cathode-ray tube television set. Material recorded for interlaced presentation may exhibit combing or ghosting when it is rescaled, filmed out or watched on a computer or another progressive-scan device without proper deinterlacing.
Some AVCHD 1080i camcorders can capture progressive video and record it within interlaced stream borrowing techniques from television industry. In particular, Progressive segmented frame (PsF) is utilized in some Panasonic (25p Digital Cinema), Canon (PF25, PF30) and Sony camcorders. The 2:3 pulldown technique is used in some 60 Hz versions of Canon (PF24) and Panasonic (24p Digital Cinema) camcorders for recording 24-frame/s progressive video. Most editing tools treat progressive video recorded within an interlaced stream as interlaced, though some editing systems and most standalone Blu-ray Disc players are capable of recognizing the pulldown pattern to recover the original frames using the process known as inverse telecine.
Progressive-scan video
[edit]
Since the very beginning, the AVCHD specification had supported 720-line progressive recording mode at frame rates of 24 and 60 frames/s for 60 Hz models and 50 frames/s for 50 Hz models. Frame rates of 25 frames/s and 30 frames/s are not directly available in 720p mode, but can be simulated with frame repeating, when every frame is either repeated twice or a special flag in the video stream instructs a decoder to play every frame twice to adhere to output rate of 50 or 60 frames/s.
Many of the digital compact cameras made by Panasonic, such as the DMC-ZS3/DMC-TZ7, DMC-FT1, DMC-FZ35/DMC-FZ38, and DMC-ZS-7/TZ-10 offer 720p video recording with effective frame rate of 25 or 30 frames/s in a format called AVCHD Lite (see below).
Until the advent of AVCHD Progressive mode, native progressive-scan video for 1080-line resolution had been available only in 24 frames/s variant. In 2010, Panasonic introduced a new lineup of consumer AVCHD camcorders with 1080-line 50p/60p progressive-scan mode (frame rate depending on region).[13] Panasonic advised that not all players that support AVCHD playback could play 1080-line 50p/60p video.[14] In 2011, this mode was officially included into the AVCHD specification as part of 2.0 addendum, and has been called AVCHD Progressive. This mode uses the same AVCHD folder structure and container files for storing video, with the maximum bit rate of 28 Mbit/s. In 2011, Sony introduced consumer and professional AVCHD models capable of AVCHD Progressive recording. In 2012 JVC announced the GY-HMQ10 model, which also can record AVCHD Progressive video.
Audio formats
[edit]Most AVCHD camcorders record audio using Dolby Digital (AC-3) compression scheme. Stereo and multichannel audio is supported. Audio data rate can range from 64 kbit/s to 640 kbit/s. In practice, data rates of 256 kbit/s and 384 kbit/s have been observed.[original research?]
Some professional models allow recording uncompressed linear PCM audio.
Media
[edit]AVCHD specification allows using recordable DVDs, memory cards, non-removable solid-state memory and hard disk drives as recording media.
DVD
[edit]
When the AVCHD standard was first announced, recordable DVD was the only recording medium.[citation needed] To reduce camcorder size, manufacturers opted for an 8 cm disc, sometimes called miniDVD. Recording capacity of an 8 cm disc ranges from 1.4 GB for a single-sided single layer disc to 5.2 GB for a double-sided double layer disc.
Pros:
- DVDs are familiar to most consumers, thus considered user-friendly.
- Recordable DVDs are relatively cheap.
- Recorded disc can be played back in most Blu-ray Disc players.
- Discs can be used for long-term storage of recorded video.
Cons:
- Some argue that the longevity of recordable DVDs may be shorter than expected.[15]
- Rewritable DVDs cost more than write-once discs.
- DVDs must be "finalized" to play back on set-top players (though DVD-RWs can be unfinalized again).
- Double-layer recording is less robust than single-layer recording.
- To use both sides of a double-sided disc it must be flipped over, because camcorders have pickup from one side only. [citation needed]
- AVCHD DVDs can only be played back on DVD/Blu-ray players specifically designed to do so.
- The AVCHD specification limits data rate for DVD-based AVCHD camcorders to 18 Mbit/s, but no DVD-based AVCHD camcorder manufactured to date is capable of recording at data rate higher than 12 Mbit/s (Canon, Sony) or 13 Mbit/s (Panasonic).
- A single-sided single-layer 8 cm DVD can fit only 15 minutes of video at 12 Mbit/s, 14 minutes at 13 Mbit/s.
- DVD pickup mechanism is very susceptible to vibration.
- 8 cm DVDs cannot be used in many slot-loading drives and may even damage the drive.
As the capacity of memory cards grew and their price dropped, DVDs use for recordable media declined. No DVD-based AVCHD camcorders have been produced since 2008. While DVDs are no longer used for acquisition, they remain popular as distribution media. Many authoring programs offer "AVCHD" profile for recording high definition video on a DVD. Such AVCHD discs are incompatible with regular DVD-Video players, but play in many Blu-ray Disc players. A conventional single-layer 12 cm DVD can store 35 minutes of video recorded at the maximum bit rate the AVCHD specification allows for DVD media—18 Mbit/s.
Hard disk drive
[edit]
A hard disk drive was added as an optional recording medium to AVCHD specification shortly after the new video standard had been announced.[16] Presently, capacity of built-in HDDs ranges from 30 GB to 240 GB.
Pros:
- Higher capacity than other media types, which allows for longer continuous recording.
Cons:
- Sensitive to atmospheric pressure. The HDD may fail if the camcorder is used at altitudes above 3,000 metres (9,800 ft).
- Vulnerable to mechanical shock or fast movement.
- All HDD-based AVCHD camcorders employ non-removable disks. To transfer video to a computer the camcorder must be connected with a USB cable. Most camcorders require using an AC power adapter for this operation.
- The sound of moving magnetic heads may be heard in the recorded video when recording in quiet environment.
- Replacing a damaged HDD requires disassembling a camcorder and cannot be done by a consumer.
Solid-state memory card
[edit]
Many AVCHD camcorders employ Secure Digital or "Memory Stick" memory cards as removable recording media. Solid-state memory cards offer rewritable storage in a compact form factor with no moving parts.
Panasonic and Sony chose removable flash memory as the sole type of recording media in their professional AVCHD lineups, specifically AVCCAM and NXCAM.
Until 2010, Sony insisted on usage of its own memory card format - Memory Stick. Since 2010, Sony has allowed using both Memory Stick as well as Secure Digital cards in its consumer and professional camcorders. Panasonic as well as other manufacturers of AVCHD camcorders use Secure Digital cards as removable flash media. Most models accept Secure Digital High Capacity cards (SDHC), while some models are also compatible with Secure Digital Extended Capacity (SDXC) cards, which offer higher transfer speed and capacity.
Pros:
- Compact and lightweight.
- Does not require time for spin-up and initialization.
- Not vulnerable to magnetic fields.
- Can withstand a wider range of air pressure, humidity and vibration than HDDs.
- Can be easily backed up to DVD for viewing and for long-term archiving.[8]
- Can store mixed media content, including still images like snapshot photos and still-frame captures.
- The recording section contains no moving parts, thus operation is almost silent; also a camera can be made more compact and less prone to mechanical damage in case of being dropped.
- Most new computers, many TV sets and Blu-ray Disc players, as well as many personal portable media players have built-in card readers and can play AVCHD video directly from a card.
Cons:
- More expensive per minute of recording than a built-in HDD or DVD media.
- Not reliable for long-term storage and may wear out more rapidly than expected, especially the cards made with MLC technology as opposed to cards using SLC technology.[17][18]
- Vulnerable to electrical damage, such as static discharge, and too high temperature.
- A bad memory card can cause data corruption, causing loss of one or more clips.
Non-removable solid-state memory
[edit]Some AVCHD camcorders come with built-in solid-state memory either as a sole media, or in addition to other media.
Pros:
- Allows making a camcorder smaller if no other media is used.
- Always available for recording, in case other type of media is full or missing.
Cons:
- Because recording media is non-removable, the recorded images should be backed up either to a computer with a USB cable to transfer video or (if the camera accepts them) to another FLASH card or even a DVD or Blu-ray through an externally connected burner. Usage of an AC power adapter may be required.
- Non-removable media cannot be shared, sent or stored separately of the camcorder.
- If damaged or worn out, non-removable media cannot easily be replaced like a memory card.
Branding
[edit]Panasonic and Sony developed several brand names for their professional as well as simplified versions of AVCHD.
AVCHD Lite
[edit]AVCHD Lite is a subset of AVCHD format announced in January 2009,[19] which is limited to 720p60, 720p50 and 720p24 and does not employ Multiview Video Coding.[20] AVCHD Lite cameras duplicate each frame of 25fps/30fps video acquired by camera sensor,[21] producing 720p50/720p60 bitstream compliant with AVCHD and Blu-ray Disc specifications. As of 2013, AVCHD Lite seems to have been all but replaced with other formats. For example, the Panasonic DMC FZ-200 offers AVCHD Progressive recording mode (50fps/60fps acquisition and stream rate) as well as MP4 mode (25fps/30fps acquisition and stream rate).[22]
AVCCAM
[edit]Formerly known as "AVCHD with professional features,"[23] AVCCAM is the name of professional AVCHD camcorders from Panasonic's Broadcast division. Some of these professional features listed in early Panasonic advertising materials included 1/3-inch progressive 3CCD sensor, XLR microphone input, solid-state media and capability of recording at the maximum AVCHD bit rate – 24 Mbit/s. The aforementioned features are not exclusive to AVCCAM. Moreover, some of these features like CCD sensor technology have been dropped by Panasonic, while 24 Mbit/s recording rate is widely available from rival manufacturers even on consumer models.
AVCHD Pro
[edit]Panasonic uses "AVCHD Pro" moniker to describe camcorders like the HDC-MDH1, which combines consumer internal parts and controls with shoulder-mount type body. Panasonic touts that the camcorder is "shaped for Pro-Style shooting in Full-HD" with shoulder-mount type body being "preferred by professionals".[10]
NXCAM
[edit]NXCAM is the name of Sony's professional video lineup employing the AVCHD format.[24] NXCAM camcorders offer 1080i, 1080p and 720p recording modes. Unlike AVCCAM, not all NXCAM camcorders offer film-like frame rates—24p, 25p, 30p—in 720p mode.
Playing back AVCHD video
[edit]Recorded AVCHD video can be played back in a variety of ways:
- Direct playback – video can be played on a television set from a camcorder through HDMI or component-video cable.
- AVCHD disc – AVCHD video, recorded onto DVD can be played on most Blu-ray Disc players[8] or on a PlayStation 3 gaming console.
- Blu-ray – AVCHD video, recorded onto Blu-ray can be played on most Blu-ray Disc players (see table below).
- AVCHD memory card – AVCHD video, recorded on an SDHC or Memory Stick card can be played on select Blu-ray Disc players, HDTV sets, on a PlayStation 3 gaming console and on some other set-top media players.
- USB playback – video files, recorded on an external storage device like a hard disk drive or a USB "stick" can be played on select Blu-ray Disc players, HDTV sets, gaming consoles, set-top media players and from a computer.
- Computer playback – any media and target format that is supported by a particular computer hardware and software can be watched on a computer monitor or TV set. Presently, the open-source VLC media player plays AVCHD video files and a wide variety of additional formats, and is freely available for most modern operating systems (including Linux, macOS, MS Windows) and some mobile platforms. Since Mountain Lion, macOS does support native AVCHD playback via the default media player, QuickTime.[25] Some Windows 7 editions can import and play AVCHD video natively, having files with extensions M2TS, MTS and M2T pre-registered in the system. (Windows 7 starter edition does not support AVCHD files out of the box, and so requires a third-party player.) In editions of Windows 7 that do support AVCHD files, Windows Media Player can index content in these files, and Windows Explorer can create thumbnails for each clip.[26] Windows 7 does not support importing of AVCHD video metadata such as thumbnail images, playlists, and clip index files. Joining AVCHD video files during the import is not supported either.[27]
AVCHD as distribution format
[edit]A DVD disc with AVCHD high-definition video recorded on it is sometimes called an AVCHD disc.[28][29] AVCHD discs cannot be played in a standard DVD player, but can be played in many Blu-ray Disc players.[citation needed] Smooth playback is not guaranteed if overall data rate exceeds 18 Mbit/s. It is possible to create simple menus similar to menus used for DVD-video discs.
AVCHD content can also be recorded on SDHC cards and played by many television sets, Blu-ray Disc players and media consoles.
The AVCHD specification does not officially support Blu-ray Disc media, though some software packages allow authoring AVCHD content on Blu-ray Discs. For better compatibility with Blu-ray Disc players AVCHD video can be authored on Blu-ray Disc media as Blu-ray Disc video. Authoring a Blu-ray Disc video title does not require re-encoding of AVCHD audio and video streams. The resultant disc plays in any Blu-ray Disc player, including those that do not explicitly support AVCHD.
Many software vendors support AVCHD mastering. In particular:
- Cyberlink PowerDirector and PowerProducer can author a compliant AVCHD disc, or BDMV on DVD media.[30]
- Corel (formerly Ulead) DVD MovieFactory 7 can master AVCHD discs with menus.[31]
- Various Sonic products can author AVCHD discs using HD/BD Plug-in.[32][33][34]
- Compressor 3.5 is capable of authoring AVCHD discs; subtitles are not supported.[35][36]
- Nero Vision 9 can create an AVCHD disc with data rate up to 18 Mbit/s, or an AVCHD-compliant folder for distribution on an HDD or a memory card with data rate up to 24 Mbit/s.[37]
- Sony DVD Architect 5 can author AVCHD-compliant discs with menus using AVC encoding as well as non-standard discs using MPEG-2 encoding. In both cases data rate is limited to 18 Mbit/s.
- Panasonic HD Writer AE can author AVCHD content on DVDs, BD discs and on SD cards.[38]
- MultiAVCHD can author AVCHD discs as well as Panasonic-compliant AVCHD memory cards.[39]
- Magix Movie Edit Pro 15 Plus with updates can author AVCHD content on DVDs, BD discs.[40]
- Pinnacle Studio 11.1.2 and higher offers AVCHD disc output.[41]
Although AVCHD shares many format similarities with Blu-ray Disc, it is not part of the Blu-ray Disc specification. Consequently, AVCHD-playback is not universally supported across Blu-ray Disc players. Blu-ray Disc players with "AVCHD" logo play AVCHD discs authored either on 8 cm or 12 cm DVDs. Players without such a logo are not guaranteed to play AVCHD discs.
The 1080-line 50p/60p AVCHD Progressive recording mode employed in some camcorders, is not compliant with the current Blu-ray Disc specification, though many current player models unofficially support it if they support AVCHD format.
Hardware products
[edit]Canon
[edit]Depending on model, Canon camcorders offer 1080-line interlaced, PsF, and native 24p recording.
- HR10 (DVD)
- 2007: HG10 (40 GB HDD)
- April 2008: HF10 (SDHC, built-in 16 GB flash memory), HF100 (SDHC)
- September 2008: HF11 (SDHC, built-in 32 GB flash memory), HG20 (60 GB HDD, SDHC), HG21 (120 GB HDD, SDHC)
- January 2009: HF S10 (SDHC, built-in 32 GB flash memory), HF S100 (SDHC), HF20 (SDHC, built-in 32 GB flash memory), HF200 (SDHC)
- August 2009: HF S11 (SDHC, built-in 64 GB flash memory, wired LANC remote capability)
- January 2010: HF S21 (two SDHC slots, 64 GB flash memory, electronic viewfinder), HF S20 (two SDHC slots, 32 GB flash memory),[42] HF S200 (two SDHC slots); HF M31 (SDHC, 32 GB flash memory), HF M30 (SDHC, 8 GB flash memory), HF M300 (SDHC); HF R11 (32 GB flash memory), HF R10 (SDHC, 8 GB flash memory), HF R100 (SDHC)
- April 2011: HF G10 (with 1⁄3 inch image sensor)
- March 2012: HF M500 (with 1⁄3 inch image sensor; 24pf, 30pf, and 60i; removable SDHC/SDXC flash memory) / HF G20 4:2:2
Hitachi
[edit]- 2008: DZ-BD10HA (Three-media recording: Blu-ray Disc, AVCHD on HDD, AVCHD on SDHC)[43]
JVC
[edit]- 2008 June: GZ-HD10 (HDD, MicroSDHC), GZ-HD30/GZ-HD40(HDD, MicroSDHC card, dual AVCHD and TOD recording)
- 2009 January: GZ-HD320 (100 GB HDD, MicroSD), GZ-HD300 (59 GB HDD, MicroSD), GZ-HM200 (dual SDHC)
- 2009 February: GZ-X900 (SD/SDHC card)
- 2009 September: GZ-HM300, GZ-HM400
- 2009 December: GZ-HD620
- 2010 March: GZ-HM1
- 2011 January: GZ-HM30 (pre-released December 2010)
- 2011: GZ-HM4XX, GZ-HM6XX, GZ-HM8XX, GZ-HM9XX
- 2013: GZ-EX555
- 2014: GZ-R10BAA
- 2018: GZ-R495BE
Leica Camera
[edit]Digital still cameras
- 2010: LEICA D-LUX 5, LEICA V-LUX 2
- 2012: LEICA D-LUX 6
Panasonic
[edit]Panasonic AVCHD camcorders offer interlaced, progressive scan or native progressive recording and combinations of these modes depending on a particular model. 1080-line and 720-line recording is possible depending on a model.
Panasonic AVCHD camcorders use AVC with High Profile @ Level 4.0 for all modes except 1080p50/1080p60, which are encoded with High Profile @ Level 4.2. Maximum data rate is limited to 24 Mbit/s for AVCCAM models, to 17 Mbit/s for most consumer models and to 28 Mbit/s for 1080p50/1080p60 recording modes.
- December 2006: HDC-DX1 (DVD), HDC-SD1 (SDHC)[44]
- HDC-SD3 (SDHC, available in Japan only)
- AG-HSC1U - essentially a rebadged HDC-HC1 (SDHC, comes with portable 40 GB HDD storage)
- August 2007: HDC-SD5 (SDHC), HDC-SX5 (DVD, SDHC), HDC-SD7 (SDHC)[45]
- January 2008: HDC-SD9 (SDHC), HDC-HS9 (60 GB HDD, SDHC)[46]
- April 2008: AG-HMC70 (SDHC)[47]
- June 2008: HDC-SD100 (SDHC), HDC-HS100 (60 GB HDD, SDHC)[48]
- September 2008: AG-HMC150 (SDHC)[49]
- January 2009: HDC-HS300 (120 GB HDD), HDC-HS200 (80 GB HDD), HDC-TM300 (32 GB built-in flash memory, SDHC), HDC-SD300 (SDHC, available in Europe only), HDC-SD200 (SDHC).
- June 2009: HDC-TM30/HDC-TM10 (32 GB built-in flash memory, SDHC), HDC-SD10 (SDHC)
- June 2009: HDC-TM350 (64 GB built-in flash memory, SDHC, available in Japan and as of October 2009, from Panasonic Stores across the UK)
- September 2009: AG-HMC40 (SDHC)[50]
- February 2010: HDC-TM700/HDC-SD700/HDC-HS700 (introduced 1080p60/1080p50 modes, depending on region)[51]
- March 2010: HDC-SD60/HDC-TM60/HDC-HS60[52]
- December 2010: AG-AF100/AG-AF101/AG-AF102 (4/3" large sensor camera)[53]
- September 2011: AG-AC130/AG-AC160 (SDXC/SDHC/SD)[54]
- June 2014: AG-AC90A; upgrade of the AG-AC90[55]
In 2009 Panasonic introduced AVCHD Lite and AVCHD to selected members of its Lumix line of digital cameras:
- 2009: DMC-ZS3/TZ7*, DMC-TS1/DMC-FT1* (AVCHD Lite)
- 2009: DMC-GH1 (AVCHD)
- 2010: Lumix DMC-ZS7/TZ10*, DMC-G2 (AVCHD lite)
- 2010: Lumix DMC-GH2, DMC-GF2 (AVCHD)
- 2011: Lumix DMC-ZS10/TZ20* (AVCHD lite)
- 2011: Lumix DMC-FX77/FX78*, DMC-TS3*, DMC-FZ45/47/48*
- 2011: Lumix DMC-GF2, DMC-G3/GF3 (AVCHD)
- 2012: Lumix DMC-ZS20/TZ30 (AVCHD, AVCHD Progressive: GPH, PSH)
- 2012: Lumix DMC-G5
- 2012: Lumix DMC-FZ200
- 2012: Lumix DMC-GH3 with a bit rate of 28 Megabit per second (AVCHD 2.0)
- 2012: Panasonic Lumix DMC-LX7
* to avoid European specific tax, Panasonic digital cameras for this market are limited to 30 minutes recording.
Sony
[edit]Consumer Sony AVCHD camcorders released before 2011 could record 1080-line interlaced video only, while the prosumer HDR-AX2000 and professional HXR-NX5 cameras were capable of recording in interlaced and progressive formats.[56]
Released in March 2011, the Sony NEX-FS100 is the first professional NXCAM camcorder capable of 1080p50/p60 recording;[57] consumer-grade HandyCam NEX-VG20 followed in August 2011.[58]

The list of AVCHD camcorders includes:
- September 2006: HDR-UX1 (DVD), HDR-UX3/UX5 (DVD), HDR-UX7 (DVD)
- October 2006: HDR-SR1 (30 GB HDD)
- June 2007: HDR-SR5 (40 GB HDD), HDR-SR7 (60 GB HDD)
- July 2007: HDR-SR5C (100 GB HDD), HDR-SR8 (100 GB HDD)
- Summer 2007: HDR-CX7 (Memory Stick Duo)
- March 2008: HDR-SR10 (40 GB HDD, Memory Stick), HDR-SR11 (60 GB HDD, Memory Stick), HDR-SR12 (120 GB HDD, Memory Stick)
- HDR-TG1/TG3/TG7 (Memory Stick Duo)
- August 2008: HDR-CX12 (Memory Stick Duo)
- March 2009: HDR-CX100 (8 GB HDD, Memory Stick Duo)
- March 2009: HDR-XR520V (240 GB HDD), HDR-XR500V (120 GB HDD Version)
- March 2009: HDR-XR200V (120 GB HDD)
- March 2009: HDR-XR200VE (120 GB HDD + GPS)
- March 2009: HDR-XR100 (80 GB HDD)
- July 2009: HDR-CX500E, HDR-CX520E
- October 2009: HDR-CX105 (8 GB Memory Stick Duo)
- January 2010: HXR-NX5, HDR-AX2000.[59]
- March 2010: HDR-XR550 (240 GB HDD)
- June 2010: Sony NEX-5, NEX-5C (without Eye-Fi support), of both models, variants with AVCHD 1080 50i and AVCHD 1080 60i only exist
- July 2010: Sony HXR-MC50E.[60]
- March 2011: Sony NEX-FS100
- August 2011: NEX-VG20
- October 2011: Sony SLT-A65, Sony SLT-A77V, Sony NEX-5N, Sony NEX-7
In 2010, Sony introduced AVCHD to selected members of its Cybershot line of digital cameras.
- January 2010: DSC-HX5V (GPS+COMPASS), HX5V-E (European version, limited to 30 minutes recording due to European specific taxes)
- March 2011: DSC-HX9V (GPS+COMPASS), HX9V-E (European version, limited to 30 minutes recording due to European specific taxes)
- 2012: DSC-HX10V, DSC-HX20V, DSC-RX100, DSC-WX50
- 2013: DSC-RX100 II, DSC-HX50V
- 2014: DSC-RX100 III
- 2015: DSC-RX100 IV
Software
[edit]Codecs
[edit]- FFmpeg includes an AVCHD decoder in its libavcodec library that is used for example by ffdshow, a free, Open Source collection of codecs for Microsoft Windows.
- CoreAVC is an H.264 decoder for Windows, which can decode AVCHD as well as a variety of other H.264 formats.
- Gstreamer uses libavcodec to decode AVCHD on Linux, BSD, OS/X, Windows, and Solaris
Converters
[edit]- Badaboom is a media converter that uses NVIDIA GPUs to accelerate conversion of AVCHD to mobile devices.
- HandBrake converts AVCHD Lite format to MP4 and MKV (tested on macOS; other versions available), AVI and OGM are supported in versions before 0.9.4.
- Roxio Toast 10 Titanium on macOS converts AVCHD to most formats.
- Total video converter is a converter for most video formats, including converting from AVCHD and burning AVCHD disc.
- iDealshare VideoGo can convert AVCHD to MP4, ProRes, MOV, AVI, WMV, FLV, DV, MKV, VOB etc.
Editors
[edit]The following video-editing software features support for the AVCHD format:
- Apple iMovie for some cameras/camcorders.
- Adobe Premiere Pro (from version CS4 onwards). (Creative Cloud 2013 version natively supports AVCHD Dolby Digital.)
- Adobe Premiere Elements (version 7 through 9 only support import, no AVCHD output), version 10 supports AVCHD output.
- Avidemux Video editor for Linux and Windows
- Apple Final Cut Pro X natively supports AVCHD through Import From Camera.
- Apple Final Cut Pro for macOS. The latest version of Final Cut Pro 7 claims better integration with Apple's other professional applications and improved codec support for editing HD, DV and SD video formats, including encoding presets for devices such as iPod, Apple TV, and Blu-ray Discs.
- Apple Final Cut Express 4, Final Cut Pro 6.0.1, and iMovie '08-'09 (iMovie is bundled with all new Apple computers; Final Cut Express and Pro are sold separately) do not support editing of AVCHD clips directly. Imported AVCHD clips are automatically converted into the Apple Intermediate Codec format, which requires more hard disk space (40 GB per hour as opposed to 13.5 GB per hour for Standard Definition DV), a more powerful machine (an Intel-based Mac), and a more recent OS (Mac OS X 10.5). Final Cut Pro 6.0.5 "logs and transfers" the footage from AVCHD to AppleProRes by default and also gives the option of converting to the Apple Intermediate Codec. It does not allow native transferring of the *.m2ts clips nor directly editing them. The latest release of Apple's iLife suite (specifically, iMovie) has added support for AVCHD Lite cameras.[61][62] It automatically imports AVCHD files when attaching a supported camera to the computer, and it can import older MTS or M2TS files that have been rewrapped (see above) e.g. as m4v.
- Avid Media Composer (version 5.x and later) supports AVCHD via transcode import. AMA linking is available in Avid Media Composer 6 when a special AMA plugin is downloaded from the Avid download center.
- AVS Video Editor supports videos from HD-cameras(HD Video (inc. AVCHD, MPEG-2 HD and WMV HD), TOD, MOD, M2TS.) Burn AVCHD video to CD-R/RW, DVD+/-R, DVD+/-RW, DVD-RAM, Double/Dual Layer on Windows XP, 2003, Vista, 7 (no macOS/Linux support).
- Blender supports the AVCHD format by using an FFmpeg decoder. Blender has a little-known, video editing system that integrates with its 3D editing tools. It supports proxy editing at down to 25% scaling, which helps when editing AVCHD video, which is slow.[63]
- Corel VideoStudio supports importing, rendering and burning of AVCHD format in Windows system.
- Cyberlink PowerDirector 11 is capable of editing AVCHD 2.0 3D/Progressive natively, without transcoding, intermediate formats or proxy files. Using a patented technique (SVRT), AVCHD clips can be edited and output losslessly to AVCHD or Blu-ray Disc. PowerDirector also supports OpenCL encoding acceleration on Intel, AMD and nVidia graphics platforms. PowerDirector can output the finished movie to a variety of video formats, DVD, AVCHD on DVD, removable storage device, SD/SDHC/SDXC memory card, Memory Stick or Blu-ray Disc.
- Dayang Montage Extreme [ME] 1.2
- Grass Valley Edius from 5.5 up to 9.5 (current version) and historically Edius Neo from 2 until 3.5 but not on current Windows versions.
- Kdenlive for Linux and BSD platforms
- Lightworks for Windows and Linux, starting with version 11.1. AVCHD support is available in the Free and Pro versions, however, the free version requires transcoding into a different format upon import of AVCHD files.[64]
- Microsoft Windows Live Movie Maker 2011 (part of the Windows Live Essentials package) converts to lower resolution for editing and playback, but is capable of exporting in HD.
- Nero Ultra Edition Enhanced (from version 7 onwards) includes the Nero Vision editor and the Nero Showtime player, which both support AVCHD files. NeroVision can author DVDs in the AVCHD format.
- OpenShot Video Editor for Windows, macOS, and Linux
- Pinnacle Studio Plus (from version 11 onwards)
- Ulead Video Studio 11 has announced a support for MTS/M2TS, however many user report that this statement is completely false and the editor cannot import video of that format, not to mention editing.
- VSDC Free Video Editor
- Pitivi Video editor for Linux
- Sony Vegas 7.0e
- Sony Vegas Pro (from version 8 onwards)
- Sony Vegas Movie Studio Platinum (from version 8 onwards)
- Other developers have pledged their support but it may still take some time for the implementation.
Open Source codecs
[edit]The following open source codecs can decode AVCHD files:
- ffdshow tryouts, revision 1971 May 23, 2008, decodes AVC (H.264) format video.[65]
- libavcodec (part of FFmpeg project) is a codec library that supports AVCHD. It is used in Jahshaka and Blender, notably.
Specifications
[edit]| Video | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Since | AVCHD 1.0 | AVCHD 2.0 | |||||||
| Subtype | High Definition (AVCHD-HD) | Standard Definition (AVCHD-SD) | AVCHD Progressive | AVCHD 3D (stereoscopic) | |||||
| Frame size in pixels |
|
1280x720 | 720x480 | 720x576 | 1920x1080 | 1440x1080 | 1280x1024 | 1920x1080 | |
| Field/frame rate | 60i, 50i, 24p | 60p, 50p, 24p | 60i | 50i | 60p, 50p | 24p, 50i, 60i | |||
| Frame aspect ratio | 16:9 | 4:3, 16:9 | 16:9 | ||||||
| Video Compression | MPEG-4 AVC/H.264; Main Profile (MP) and High Profile (HP), Level 4.1 (AVCHD 1.0) or 4.2 (AVCHD 2.0).[66] | ||||||||
| Luminance sampling frequency |
|
74.25 MHz | 13.5 MHz | 13.5 MHz | 148.5 MHz | 111.4 MHz | 74.25 MHz | ||
| Chroma sampling format | 4:2:0 | ||||||||
| Quantization | 8 bits (both luminance and chrominance) | ||||||||
| Audio (Dolby Digital) | |||||||||
| AC-3 Compression | Dolby Digital (AC-3) | ||||||||
| AC-3 channel mode | 1–5.1 channels | ||||||||
| AC-3 compressed bitstream rate | 64 to 640 kbit/s | ||||||||
| Audio (PCM; NXCAM only) | |||||||||
| PCM type | Linear PCM uncompressed audio | ||||||||
| PCM channel mode | 1–7.1 channels | ||||||||
| PCM bit rate | 1.5 Mbit/s (2 channels) | ||||||||
| System | |||||||||
| Stream type | MPEG transport stream | ||||||||
| System data rate |
|
up to 28 Mbit/s | |||||||
| File extension (generally) | mts (on camcorder), m2ts (after import to computer) | ||||||||
| Media |
| ||||||||
For simplicity, the combination of frame rate and video format is denoted using the common simplified notation of NNx, where NN is the frame rate rounded to integer and x is the format ("i" for interlaced and "p" for pregressive). In this table, "60" actually runs at 59.94 frames/sec, "30" actually runs at 29.97 frames/sec, and "24" actually runs at 23.976 frames/sec, a relic of NTSC video.
See also
[edit]- AVC-Intra: an intra-frame video format based on AVC compression scheme, offered on professional Panasonic video cameras.
- iFrame: an intra-frame video format based on AVC compression scheme, marketed by Apple and offered on some consumer camcorders.
- AVCREC: a standard to allow recording of broadcast HD programming on recordable DVDs using AVC encoding scheme.
- Comparison of video editing software
- XAVC
References
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- ^ a b Panasonic Marketing Middle East & Africa FZE. "AVCHD Pro Camcorder HDC-MDH1". Archived from the original on 2013-10-12. Retrieved 2013-10-11.
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- ^ "Lumix DMC-FZ200 specifications". Panasonic. Archived from the original on 2013-03-29. Retrieved 2013-04-11.
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- ^ "Editing AVCHD with Final Cut Studio Pro 2, page 13" (PDF). Retrieved 21 June 2023.
- ^ "What's the difference between BDMV (on DVD media) and AVCHD?". Archived from the original on 2011-07-19.
- ^ "DVD MovieFactory 7". Corel Corporation.
- ^ "Burning High-def DVDs & Blu-ray Discs with Creator 2009".
- ^ "Toast 9 HD/BD Plug-in: affordable high-def DVD and Blu-ray Disc video authoring for Toast 9". Archived from the original on 2009-08-02. Retrieved 2009-08-07.
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- ^ "Compressor 3 User Manual" (PDF). Retrieved 21 June 2023.
- ^ "Final Cut Server 1.5: Blu-ray Disc and AVCHD output options only available in Compressor 3.5 with Final Cut Studio (2009)". Archived from the original on 2010-02-04.
- ^ "Support". Nero AG. Retrieved 21 June 2023.
- ^ "Panasonic HDC-TM300". iXBT.com. Retrieved 21 June 2023.
- ^ "multiAVCHD home". multiavchd.deanbg.com. Retrieved 21 June 2023.
- ^ "Welcome to MAGIX". www.magix.com. Retrieved 21 June 2023.
- ^ "Pinnacle Studio: Video Editing Software & Screen Recorder". www.pinnaclesys.com. Retrieved 21 June 2023.
- ^ "Canon U.S.A. Introduces a Powerful New VIXIA Lineup to Meet the Needs of Every User". Canon. 2010-01-05. Retrieved 24 December 2010.
- ^ 30GB HDD hybrid camcorder with built-in hard disc drive (PDF)[permanent dead link]
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- ^ "Panasonic unveils two new AVCHD camcorders with new face detection and intelligent shooting guide" (Press release). Las Negas, NV, USA: Panasonic Consumer Electronics Company. 2008-01-06. Archived from the original on 2008-04-29.
- ^ "Panasonic ships industry's first professional AVCHD shoulder-mount camcorder" (Press release). Secausus, NJ, USA: Panasonic Consumer Electronics Company. 2008-02-13. Archived from the original on 2009-01-11.
- ^ "Panasonic introduces two first AVCHD camcorders with a 3MOS system" (Press release). Secausus, NJ, USA: Panasonic Consumer Electronics Company. 2008-06-18. Archived from the original on 2008-09-23.
- ^ "Panasonic unveils pricing and ship date for the AG-HMC150 camcorder" (Press release). Panasonic Consumer Electronics Company. 2008-07-31.
- ^ "Panasonic unveils AG-HMC40, low cost professional AVCCAM handheld camcorder" (Press release). Panasonic Consumer Electronics Company. 2009-04-19. Archived from the original on 2015-01-14. Retrieved 2018-09-28.
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- ^ "Sony HandyCam NEX-VG20 store.sony.com". Retrieved 21 June 2023.
- ^ "SONY unveils new solid state camcorders". Archived from the original on 10 January 2010. Retrieved 21 June 2023.
- ^ "Sony Professional - Products and Solutions To Redefine Your Business". pro.sony. Retrieved 21 June 2023.
- ^ "iMovie 8.0.3". Apple Inc. 2009-06-04.
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- ^ "ffdshow tryouts | Official Website". ffdshow-tryout.sourceforge.net. Retrieved 21 June 2023.
- ^ Understanding AVCHD; The codec differs from H.264/AVC in several ways., October 2011
External links
[edit]AVCHD
View on GrokipediaIntroduction
History and Development
The AVCHD format was jointly developed by Sony Corporation and Panasonic (then known as Matsushita Electric Industrial Co., Ltd.) as a high-definition digital video recording standard aimed at consumer camcorders, serving as a more efficient alternative to the tape-based HDV format.[5] The initiative focused on leveraging the H.264/AVC compression codec to enable recording on compact media like DVDs and memory cards, addressing the need for smaller, more portable HD solutions in the mid-2000s. Development efforts culminated in the format's official specification, with the AVCHD Information website launching on July 13, 2006, to provide details and licensing information.[6] The format was publicly announced on May 11, 2006, shortly after the NAB convention in April, marking a significant push toward file-based HD recording for prosumer and consumer markets.[7] Initially spearheaded by Sony and Panasonic, AVCHD quickly gained collaborative support from other manufacturers, including Canon, JVC, and Hitachi, who adopted the standard for their camcorder lines starting in 2006 and beyond, broadening its ecosystem through shared licensing and product integration.[2] The first commercial AVCHD camcorders appeared in 2007, with Panasonic releasing the HDC-SD1—a compact SD card-based model—and Sony introducing models like the HDR-SR1 and HDR-UX1, enabling widespread consumer access to HD video capture without bulky tape mechanisms.[8] In January 2009, Panasonic and Sony introduced AVCHD Lite, a simplified variant supporting 720p resolution to make the format more accessible for entry-level devices.[2] This was followed by the major update to AVCHD Version 2.0 on July 1, 2011, which added support for 3D video (via MVC extension) and progressive scan modes up to 1080p/60, along with new trademarks like "AVCHD 3D" and "AVCHD Progressive" to denote enhanced capabilities.[2] These enhancements expanded AVCHD's applicability in creative workflows, including stereoscopic content and smoother motion rendering. By 2025, AVCHD remains a legacy format with no major updates since Version 2.0, continuing to receive software support in professional editing tools and playback devices but largely overshadowed by successor technologies like Sony's XAVC and broader HEVC/H.265 adoption for higher efficiency and 4K/8K resolutions.[1][9] Its enduring presence is evident in ongoing compatibility for archival footage in workflows, though new productions favor more advanced codecs for superior compression and frame rates.[1]Overview and Key Features
AVCHD (Advanced Video Coding High Definition) is a file-based format for the recording, playback, and distribution of high-definition video, utilizing H.264 (MPEG-4 AVC) compression to enable efficient storage on various media such as DVDs, memory cards, and hard drives.[10] Developed jointly by Sony and Panasonic, it targets consumer and prosumer camcorders, providing high-quality HD video in a compact form suitable for personal and light professional use.[11] The format supports resolutions including 1080i, 1080p (via AVCHD 2.0), and 720p, allowing flexibility for different recording needs while maintaining compatibility with standard-definition modes like 480i or 576i in earlier variants.[2] Video is encoded using the H.264 codec with 4:2:0 chroma subsampling and 8-bit quantization, achieving bit rates up to 28 Mbps (18 Mbps on DVD media) for efficient compression that extends recording times on limited media compared to predecessors like HDV, which rely on less efficient MPEG-2 encoding and result in larger file sizes.[3][11] Audio is compressed via Dolby Digital (AC-3) at bit rates from 64 to 640 kbps (supporting up to 5.1 channels) or uncompressed Linear PCM at 1.5 Mbps (up to 7.1 channels), ensuring high-fidelity sound.[11] Additionally, AVCHD's structure aligns with Blu-ray Disc authoring standards, facilitating seamless transfer to optical discs for playback on HDTVs and compatible players.[10] Video clips are stored as .mts files within a BDMV directory structure, including subfolders like STREAM for media files and PLAYLIST for playback organization, promoting easy editing and non-linear workflows in consumer software.[12] Primary applications include home video recording, event capture such as weddings or family gatherings, and entry-level professional production, where its balance of quality, portability, and editability offers advantages over tape-based formats like HDV by enabling smaller files and faster post-production without specialized hardware.[1]Technical Specifications
Video Encoding and Formats
AVCHD utilizes the MPEG-4 AVC/H.264 video codec for compression, enabling efficient high-definition encoding while maintaining compatibility with consumer and professional devices.[11] This codec operates primarily with Main Profile for basic implementations, employing 4x4 pixel blocks for motion compensation, and High Profile for advanced scenarios, which incorporates both 4x4 and 8x8 pixel blocks to improve compression efficiency without significant quality loss.[13] The 4:2:0 chroma subsampling and 8-bit quantization for luminance and chrominance further optimize file sizes for storage on media like DVDs and memory cards.[3] The format supports high-definition resolutions of 1920×1080 for 1080i and 1080p modes, as well as 1280×720 for 720p, ensuring broad compatibility with HD displays and broadcast standards.[3] Lower-resolution options like 1440×1080 (anamorphic) and standard-definition 720×480 or 720×576 are also available for versatility, though the focus remains on HD content.[11] These resolutions are scanned at sampling frequencies up to 74.25 MHz for HD, providing sharp detail suitable for professional video production.[3] Frame rates in AVCHD cater to both regional standards and creative needs, with interlaced options at 50i or 60i for 1080-line video, where each frame combines two fields (odd and even lines) captured sequentially to reduce bandwidth while preserving motion for broadcast compatibility.[3] Progressive-scan modes deliver full frames for smoother playback, supporting 24p, 25p, or 30p across resolutions, alongside higher rates of 50p or 60p introduced in version 2.0 for 1080p to enable cinematic or fluid action sequences.[2]| Mode | Resolution | Frame Rates | Scanning Type |
|---|---|---|---|
| 1080 | 1920×1080 | 60i, 50i, 24p, 25p, 30p, 50p, 60p | Interlaced or Progressive |
| 720 | 1280×720 | 60p, 50p, 24p, 25p, 30p | Progressive |
Audio Encoding and Formats
AVCHD primarily employs Dolby Digital (AC-3) as its audio codec, a lossy compression format that supports up to 5.1 surround sound channels for immersive audio experiences in high-definition video recordings.[14] This codec enables efficient storage by compressing audio data while maintaining perceptual quality suitable for consumer and professional camcorders. In higher-end implementations, Linear PCM serves as an alternative uncompressed codec, offering up to 7.1 channel configurations for applications requiring unaltered audio fidelity, such as post-production workflows.[14][15] The standard sampling rate for AVCHD audio is 48 kHz, ensuring compatibility with professional video standards and capturing frequencies up to approximately 20 kHz for human hearing.[16] Bit depths are typically 16-bit for AC-3, providing a dynamic range of about 96 dB, while Linear PCM supports up to 24-bit in select configurations for enhanced resolution and lower noise floors, though 16-bit is common in standard AVCHD devices.[16][15] Channel configurations in AVCHD include stereo (2.0) for basic recordings, 5.1 surround for multichannel audio, and dual mono for multilingual content, allowing separate left and right channels for different languages.[14] Audio bitrates for AC-3 range from 64 kbps to a maximum of 640 kbps, balancing quality and file size within the overall stream constraints.[14] These audio streams are integrated into an MPEG-2 transport stream alongside the H.264 video, facilitating seamless multiplexing.[14] Synchronization between audio and video in AVCHD relies on timecode alignment with video frames, enabling precise editing by embedding temporal metadata that matches audio samples to corresponding video timestamps in the transport stream.[14] This mechanism ensures lip-sync accuracy and supports non-linear editing tools without drift over long clips.[17]Storage and Media Support
Optical and Removable Media
AVCHD supports recording on various optical and removable media, enabling high-definition video capture in consumer devices such as camcorders. Optical media primarily include DVD-based discs, which provide a cost-effective option for archiving footage, while removable solid-state cards offer flexibility for on-the-go recording. These media types leverage the format's efficient H.264 compression to store HD content within practical capacity limits.[13] DVD support encompasses single-layer DVD-R and DVD+R discs with a capacity of approximately 4.7 GB, as well as dual-layer variants like DVD-R DL offering up to 8.5 GB. These discs allow recording of HD video at bitrates up to 18 Mbps, typically yielding about 60 minutes of 1080i footage on an 8.5 GB disc under standard conditions. AVCHD discs authored on DVD media are compatible with Blu-ray players and devices like the PlayStation 3, but they require specific playback hardware and are not supported by conventional DVD players due to the higher data demands.[13][18] Blu-ray compatibility extends to authoring AVCHD content on BD-R and BD-RE discs, which fully align with the format's specifications for higher bitrates up to 28 Mbps (AVCHD 2.0). This allows for longer recording durations and preserved quality on media with capacities starting at 25 GB for single-layer discs, making it suitable for extended HD sessions playable on standard Blu-ray players without format conversion. The BDMV folder structure used in AVCHD authoring mirrors Blu-ray conventions, facilitating seamless integration.[13][3] Solid-state memory cards, particularly SD, SDHC, and SDXC variants, serve as primary removable media for AVCHD recording, supporting random access that simplifies editing workflows. Recording times scale with card capacity and speed class; for instance, Class 10 or higher is recommended for smooth 1080p capture to handle sustained bitrates without interruptions. A typical 4 GB SDHC card at 17 Mbps bitrate accommodates 30 to 45 minutes of HD video, while a 16 GB card holds approximately 110 minutes at 17 Mbps (standard HD mode), scaling with bitrate and exact capacity. These cards emphasize portability, allowing quick media swaps and direct transfer to computers for post-production. Bitrate choices, such as 17 Mbps for standard HD, directly influence duration on a given capacity, as higher rates prioritize quality over length.[13][19]Internal and Hard Drive Storage
AVCHD camcorders often incorporate built-in hard disk drives (HDDs) as non-removable storage options, enabling extended recording sessions without the need for media swaps. These HDDs typically range from 60 GB to 240 GB in capacity, depending on the model, allowing users to capture several hours of high-definition footage continuously. For instance, the Sony HDR-XR550V features a 240 GB HDD that supports up to approximately 23 hours of HD video recording at the highest quality setting (FX mode, 24 Mbps).[20] This capacity is particularly advantageous for prolonged shoots, such as events or documentaries, where uninterrupted recording is essential.[21] In addition to HDDs, some AVCHD devices utilize non-removable solid-state memory, commonly implemented as internal flash storage, which provides an alternative to mechanical drives. These flash-based systems, often ranging from 8 GB to 32 GB, offer faster data access speeds compared to HDDs, reducing seek times during playback and editing previews. For example, the Canon VIXIA HF R20 includes 8 GB of internal flash memory for AVCHD recording.[22] Solid-state storage also enhances durability by eliminating moving parts, making it more resistant to vibrations and shocks encountered during handheld operation.[23] The recording process on internal storage follows a file-based workflow, where video data is written linearly to the device's filesystem in a structured directory format compatible with AVCHD specifications. This involves sequential creation of transport stream files (.m2ts) in the BDMV/STREAM folder, while separate playlist files (.mpls) in the BDMV/PLAYLIST directory manage clip organization and non-destructive editing by defining playback sequences, timestamps, and seamless connections between segments without altering the original streams.[12] This approach allows users to divide long recordings into manageable clips post-capture, supporting in-camera editing for immediate review.[24] Key advantages of internal storage in AVCHD devices include significantly higher capacities relative to removable media, enabling extended sessions—for example, a 120 GB HDD can store about 22 hours of footage at a 12 Mbps bitrate, scaling to over 40 hours at lower rates—while flash memory provides superior vibration resistance for mobile shooting.[25] Transferring content from internal storage to computers typically occurs via USB connection, with the device set to mass storage or MTP mode for direct file access through the operating system's file explorer, or via manufacturer software for optimized import.[26] This method preserves the AVCHD file structure, allowing seamless integration into editing workflows.[27]Format Variants
Consumer and Lite Variants
AVCHD Lite, introduced by Panasonic in 2009 for its Lumix digital cameras such as the DMC-ZS3/TZ7 and DMC-TS1/FT1, represents a simplified subset of the AVCHD format tailored for compact, entry-level devices.[28][29] This variant restricts video recording to 720p resolution (1280×720 pixels) at frame rates up to 60p or 50p, with maximum bitrates of 17 Mbps, alongside options at 13 Mbps and 9 Mbps to balance quality and storage efficiency.[30][31] Audio is encoded in Dolby Digital (AC-3) at up to 640 kbps with stereo channels, enabling longer recording times on SD cards compared to full AVCHD modes.[14] Standard consumer AVCHD builds on this foundation but supports full 1080i resolution (1920×1080 or 1440×1080 interlaced at 60i or 50i), optimized for home video applications with typical bitrates of 17 Mbps in high-quality (HA) modes, though lower options at 13 Mbps (HG) and 9 Mbps (HX) are available in some implementations for balanced detail and file size.[13][14][32] These configurations prioritize accessibility over maximum fidelity, using H.264 compression within an MPEG-2 transport stream to produce files suitable for playback on basic Blu-ray players and DVD recorders without specialized hardware.[33] Both variants cater to everyday users, such as families capturing vacations or individuals vlogging casual content, where ease of sharing via smaller file sizes—often half that of professional modes—facilitates upload to online platforms or transfer to computers.[29] Key differences from broader AVCHD implementations include the absence of 60p progressive frame rates and reduced maximum bitrates, which limit motion handling but ensure compatibility with lower-end storage media like SD cards and 8 cm DVDs.[30][14] Adoption of these consumer and Lite variants peaked in entry-level camcorders from Panasonic and Sony through the early 2010s, appearing in models like Panasonic's HDC-SD series and Sony's Handycam line until around 2015, when shifts toward MP4 and 4K formats began to phase them out for non-professional use.[33][8]Professional and Branded Variants
Panasonic introduced AVCCAM as its professional implementation of the AVCHD format in 2008 with the AG-HMC150 camcorder, targeting event videography and broadcast production workflows.[34] This line emphasizes compact, file-based recording on SD cards, supporting 1080p video at bitrates up to 28 Mbps in progressive scan modes introduced in later models like the 2012 AG-AC90.[35] Key enhancements include proxy recording for efficient editing, where low-resolution proxy files are generated alongside full-resolution clips to streamline post-production without compromising quality.[36] Metadata support extends to production essentials such as clip names, scene markers, and user-defined bits, facilitating integration into nonlinear editing systems.[37] AVCHD Pro refers to enhanced professional extensions of the core AVCHD specification, particularly those incorporating Version 2.0 features for advanced production needs. These variants support progressive frame rates like 1080p50 and 1080p60, enabling smoother motion capture for sports and fast-action scenarios compared to interlaced modes in earlier versions.[38] Audio capabilities are expanded to up to 7.1-channel linear PCM, accommodating multichannel surround sound for broadcast and film applications, while maintaining compatibility with Dolby AC-3 for 5.1 setups.[39] Such enhancements position AVCHD Pro as a bridge between consumer-grade simplicity and professional demands, often implemented in camcorders with dual-card slots for relay recording to prevent data loss during extended shoots. Sony launched NXCAM in 2010 as its branded professional AVCHD ecosystem, debuting with the HXR-NX5U camcorder to serve documentary, corporate, and ENG (electronic news gathering) workflows.[40] The format integrates AVCHD streams within MXF (Material Exchange Format) wrappers in select models, enhancing interoperability with broadcast standards and non-linear editors that require MXF for metadata embedding and archiving.[41] This hybrid approach allows seamless transition to higher-end XDCAM systems, with NXCAM devices supporting 1080p recording up to 28 Mbps and features like variable frame rates for creative slow-motion effects.[42] Other manufacturers adopted AVCHD for professional applications, often blending it with proprietary enhancements. Canon's XA series, such as the 2010 XA10, utilized AVCHD in a compact professional camcorder design for event and corporate video, later hybridizing with XF-AVC codecs in models like the XF405 to support both 1080p AVCHD and 4K workflows for mixed-resolution productions. JVC incorporated AVCHD into its professional GY-HM line, including the 2009 GY-HM100, which targeted broadcast and film crews with 1080i/60 recording on P2 cards, evolving from the consumer-oriented Everio series to include pro features like genlock and timecode synchronization. Professional AVCHD variants commonly include advanced metadata features, such as SMPTE timecode embedded in SEI messages for precise synchronization in multi-camera setups, and GPS geotagging for location-based logging in field production.[43] Version 2.0 and later specifications added support for 3D stereoscopic recording using MVC (Multiview Video Coding), allowing dual-stream capture for immersive content without exceeding Blu-ray Disc compatibility limits.[2] As of 2025, AVCHD remains relevant in hybrid professional workflows, particularly for cost-effective 1080p production in education, events, and secondary camera roles, but many users are transitioning to Sony's XAVC format for its higher bitrates, 4K support, and improved codec efficiency in modern editing pipelines.[44][42]Playback and Compatibility
Hardware Playback Devices
AVCHD playback and recording hardware encompasses a range of consumer and professional devices, primarily camcorders, dedicated players, televisions, and hybrid cameras, with native support introduced by key manufacturers since the format's launch in 2006.[45] Camcorders from major manufacturers were among the first to adopt AVCHD natively, enabling high-definition video capture on flash memory or internal storage. Panasonic's HC series, such as the HC-V900K and HC-X1500, supports AVCHD format version 2.0 compliant recording, including progressive modes for Full HD video.[46][47] Sony's HDR-CX series, including models like the HDR-CX405 and HDR-CX240, records in AVCHD with resolutions up to 1920x1080 at 60p, utilizing H.264 compression for efficient storage.[48][49] Canon's VIXIA HF series, such as the HF11 and HF100 for 1080i capture, and later models like the HF M40 supporting progressive modes in AVCHD 2.0, often paired with optical image stabilization for handheld use.[50][51][52] Dedicated playback devices include Blu-ray players released from 2008 onward, which generally support AVCHD discs and files without requiring additional hardware modifications.[53] Set-top boxes and televisions equipped with USB ports also facilitate AVCHD playback, allowing users to connect memory cards or external drives directly for video rendering.[54] Hybrid cameras combining still photography and video capabilities extend AVCHD support to more versatile devices. JVC's Everio R series and models like the GZ-X900 offer AVCHD recording alongside high-resolution stills, targeting users needing integrated photo-video workflows.[55][56] Leica-branded lenses appear in select Panasonic hybrids, such as those in the HC lineup, enhancing optical performance for AVCHD video.[57] Compatibility challenges arise with older hardware, where many pre-2010 devices are limited to 1080i AVCHD playback and may not handle progressive scan or higher bitrates, leading to potential stuttering or non-recognition of files.[58] In contrast, smart TVs available as of 2025 typically support all AVCHD variants via USB ports, processing H.264-encoded files seamlessly across brands like Samsung, LG, and Sony.[59] AVCHD discs, authored on standard DVD media, can be played on conventional Blu-ray hardware without special licensing requirements, as the format aligns with Blu-ray's MPEG transport stream structure.[53][54]Software Playback and Editing Tools
Several software applications provide native playback support for AVCHD files on desktop operating systems. Windows Media Player version 12 and later, on Windows 7 and above, offers native AVCHD playback through built-in H.264 and Dolby Digital codec support.[60] QuickTime Player on macOS supports AVCHD playback natively since version 7, though additional plugins like the Panasonic AVCCAM Importer may be required for seamless handling of .mts files and folder structures.[61][62] VLC Media Player, a free cross-platform tool, reliably plays AVCHD files without requiring plugins, leveraging its extensive codec libraries to decode H.264 video and AC-3 audio streams directly from .m2ts containers.[63][64] For editing, professional software suites enable full AVCHD import and timeline manipulation. Adobe Premiere Pro has supported native AVCHD import since version CS4 (2008), allowing users to ingest .mts clips via the Media Browser while preserving the original folder hierarchy for spanned recordings.[65][66] Apple Final Cut Pro, starting with version 7, uses the Log and Transfer utility to import AVCHD footage, automatically transcoding clips to ProRes for editing while requiring the complete AVCHD directory structure from the source media.[67][68] Free tools also facilitate AVCHD handling for users seeking accessible options. DaVinci Resolve supports direct import and timeline editing of AVCHD files in versions 17 and later, with improved stability for spanned clips when the full folder structure is maintained, though it may require optimization for large projects to avoid crashes.[69][70] HandBrake, primarily a transcoder, provides basic playback preview capabilities for AVCHD sources during the encoding process, allowing users to verify clips before conversion without additional software.[71] As of 2025, modern operating systems like Windows 11 and macOS Sequoia enhance AVCHD 1080p playback through improved GPU acceleration for H.264 decoding, reducing CPU load and enabling smoother real-time rendering in compatible players via hardware-accelerated scheduling features.[72] A key challenge in AVCHD workflows remains the requirement for the intact folder structure—typically the PRIVATE/AVCHD/BDMV/STREAM hierarchy—during direct import into editing software, as individual .mts files may not link properly without accompanying index files like index.bdmv.[67] For older software lacking native support, transcoding to formats like MP4 or ProRes is often necessary to ensure compatibility and avoid playback issues.[73]Encoding and Conversion
Codec Implementation
AVCHD employs the H.264/AVC (Advanced Video Coding) standard as its primary video codec, utilizing the High Profile at Level 4.0 or 4.2 (for 1080p50/60) for efficient compression of high-definition content up to 1080p resolution. This configuration allows for 4:2:0 chroma subsampling while maintaining compatibility with consumer-grade playback devices. Although AVCHD remains supported for legacy footage as of 2025, it has been largely superseded by more efficient formats in new consumer and professional devices.[3] Open-source implementations of AVCHD codec handling are facilitated through tools like FFmpeg, which leverages the libavcodec library for H.264 encoding and decoding, alongside libavformat for muxing and demuxing the MPEG-2 Transport Stream (M2TS) container used in AVCHD files.[74] FFmpeg enables developers to process AVCHD streams without proprietary dependencies, supporting operations such as extraction of video and audio tracks for further manipulation in open ecosystems.[75] Proprietary implementations provide optimized performance tailored to specific hardware ecosystems. Sony integrates AVCHD encoding directly into Vegas Pro via its custom AVC Intra plug-in, which accelerates rendering using GPU resources for seamless integration in nonlinear editing environments. Similarly, Panasonic offers SDKs for AVCHD-compatible camcorders, allowing developers to access codec parameters and stream handling in professional recording devices like the AG-CX series. Decoding of AVCHD streams benefits from hardware acceleration to reduce CPU load during playback and processing. NVIDIA's NVDEC technology supports dedicated H.264 decoding, including AVCHD-specific bitstreams, across compatible GPUs for efficient real-time performance.[76] Intel Quick Sync Video similarly accelerates H.264/AVCHD decoding on integrated graphics processors, enabling smooth handling in software applications and embedded systems. Commercial use of AVCHD requires licensing from the AVCHD Format Co-Promoters; royalties apply per unit for encoders, decoders, and compliant devices to ensure adherence to specifications.[77]File Conversion and Editing Software
Various software tools facilitate the conversion of AVCHD files to more compatible formats, enabling seamless integration into modern workflows. HandBrake, an open-source video transcoder, supports direct input of AVCHD (.MTS) files and outputs to widely used containers like MP4 or MKV, preserving H.264 video streams while allowing audio adjustments to AAC for better compatibility.[78] Adobe Media Encoder, part of the Adobe Creative Cloud suite, excels in professional conversions, such as transcoding AVCHD to ProRes for high-quality intermediate editing, with options for batch processing multiple clips from camera folders.[79] Editing software with native or optimized AVCHD support streamlines post-production without initial full re-encoding. Vegas Pro (formerly Sony Vegas) offers a native AVCHD timeline, allowing users to import and edit .MTS files directly while maintaining original quality through proxy workflows for smoother playback during cuts and effects application. iMovie, Apple's consumer-grade editor, imports AVCHD footage by automatically converting it to Apple Intermediate Codec for timeline editing, followed by export to H.264-encoded formats suitable for sharing or further processing.[80] Efficient workflows emphasize transcoding strategies to minimize re-encoding losses, such as remuxing AVCHD streams into editing-friendly wrappers without altering the compressed video data, which preserves bitrate and reduces generational quality degradation. Batch processing is essential for handling large AVCHD folder structures from camcorders, with tools like Adobe Media Encoder automating the queue for multiple files to expedite conversion of entire shoots.[81] Common output formats from AVCHD conversions include MP4, optimized for web distribution due to its broad browser and device support, and MOV, which integrates natively with Apple ecosystems like Final Cut Pro for professional grading and assembly.[82] As of 2025, AI-driven tools like Topaz Video AI enhance AVCHD conversion by providing upscaling capabilities, such as converting 1080p AVCHD footage to 4K resolution through machine learning models that recover details and reduce artifacts, ideal for archival restoration or modern display requirements.[83]Detailed Technical Details
File Structure and Profiles
AVCHD employs a hierarchical file structure based on the BDMV (Blu-ray Disc Movie) directory format, which organizes video clips, metadata, and playback information for efficient storage and retrieval on media such as memory cards, hard drives, or optical discs.[84] The root directory typically includes anAVCHD folder, beneath which lies the BDMV directory containing essential subfolders: PLAYLIST for organizing playback sequences, CLIPINF for individual clip details, and STREAM for the actual media streams. This structure ensures compatibility with Blu-ray playback devices while supporting file-based recording from camcorders.[13][10]
The core container format for AVCHD media is the MPEG-2 Transport Stream (TS), encapsulated in .m2ts files stored within the STREAM folder. These files multiplex video, audio, and subtitle streams, enabling robust error correction and seamless playback even in less reliable storage environments like removable media. For disc-based implementations, such as 8 cm DVD media, the structure aligns with BDAV (Blu-ray Disc Audio/Visual) specifications, maintaining the TS container while allowing navigation via the BDMV layout. In contrast, memory card recordings prioritize the TS format for its suitability in random-access scenarios.[10][84][13]
AVCHD supports specific profiles to balance compression efficiency and quality, including the H.264/AVC High Profile for high-definition content, which utilizes both 4x4 and 8x8 pixel blocks for advanced intra-prediction and transform coding. These profiles ensure interoperability with devices supporting MPEG-4 AVC standards.[13][84]
Metadata management is handled through binary files in the CLIPINF and PLAYLIST directories: .clpi files provide clip-specific information, such as timestamps, stream Program Identifiers (PIDs), and duration, enabling precise synchronization during editing or playback. Complementing these, .mpls playlist files link multiple clips into navigable sequences, defining playback order, chapters, and markers without altering the underlying streams. This metadata layer facilitates non-destructive editing and enhances user control over content organization.[13][84]
Version 2.0 of the AVCHD specification introduces support for 3D content via the Multiview Video Coding (MVC) extension to H.264/AVC, allowing stereoscopic encoding in a side-by-side format within the existing TS container. This enables dual-view streams for left and right eye perspectives, multiplexed into a single .m2ts file while preserving backward compatibility with 2D devices that ignore the auxiliary MVC view. The 3D structure integrates seamlessly into the BDMV directories, with metadata updated to flag stereoscopic clips.[85][84]
