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Avid DNxHD
Avid DNxHD
Avid DNxHD
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Avid DNxHD ("Digital Nonlinear Extensible High Definition") is a lossy high-definition video post-production codec developed by Avid for multi-generation compositing with reduced storage and bandwidth requirements. It is an implementation of SMPTE VC-3 standard.[1]

Overview

[edit]

DNxHD is a video codec intended to be usable as both an intermediate format suitable for use while editing and as a presentation format. DNxHD data is typically stored in an MXF container, although it can also be stored in a QuickTime container.

On February 13, 2008, Avid reported that DNxHD was approved as compliant with the SMPTE VC-3 standard.[2]

DNxHD is intended to be an open standard, but as of March 2008, has remained effectively a proprietary Avid format. The source code for the Avid DNxHD codec is freely available from Avid for internal evaluation and review, although commercial use requires Avid licensing approval. It has been commercially licensed to a number of companies including Ikegami, FilmLight, Harris Corporation, JVC, Seachange, EVS Broadcast Equipment.[3]

On September 14, 2014, at the Avid Connect event in Amsterdam, Netherlands, Avid announced the DNxHR codec to support resolutions greater than 1080p, such as 2K and 4K.[4]

On December 22, 2014, Avid Technology released an update for Media Composer that added support for 4K resolution, the Rec. 2020 color space, and a bit rate of up to 3,730 Mbit/s with the DNxHR codec.[5][6]

Implementations

[edit]

DNxHD was first supported in Avid DS Nitris (Sept 2004), then Avid Media Composer Adrenaline with the DNxcel option (Dec 2004) and finally by Avid Symphony Nitris (Dec 2005). Xpress Pro is limited to using DNxHD 8-bit compression, which is either imported from file or captured using a Media Composer with Adrenaline hardware. Media Composer 2.5 also allows editing of fully uncompressed HD material that was either imported or captured on a Symphony Nitris or DS Nitris system. Ikegami's Editcam camera system is unique in its support for DNxHD, and records directly to DNxHD encoded video. Such material is immediately accessible by editing platforms that directly support the DNxHD codec. The Arri Alexa supports DNxHD since November 2011. Blackmagic Design HyperDeck Shuttle 2 and HyperDeck Studio support DNxHD as of 2012.[7] AJA Video Systems has supported the DNxHD codec in its Ki Pro Mini and Ki Pro Rack recorders and players since 2012.

A standalone QuickTime codec for both Windows XP and Mac OS X is available to create and play QuickTime files containing DNxHD material.

Since September 2007, the open source FFmpeg project is providing 8-bit VC-3/DNxHD encoding and decoding features thanks to BBC Research who sponsored the project and Baptiste Coudurier who implemented it. In July 2011, FFmpeg added 10-bit encoding support.[8] DNxHD support is included in stable version 0.5 of FFmpeg, released on March 10, 2009.[9][10] This allows Linux non-linear video editors Cinelerra and Kdenlive to use DNxHD.

At the April 2012 NAB show, Brevity introduced a customized algorithm for the accelerated transport and encoding of DNxHD files.[11]

Technical details

[edit]
See also: List of Avid DNxHD resolutions

DNxHD is very similar to JPEG. Every frame is independent and consists of VLC-coded DCT coefficients.

The header consists of many parts and may include quantization tables and 2048 bits of user data. Each frame also has two GUIDs and timestamp. The frame header is packed into big-endian dwords. Actual frame data consists of packed macroblocks using a technique almost identical to JPEG: DC prediction and variable-length codes with run length encoding for other 63 coefficients. DC coefficient is not quantized.

The codec supports alpha channel information.

VC-3

[edit]

The DNxHD codec was submitted to the SMPTE organization as the framework for the VC-3 family of standards. It was approved as SMPTE VC-3 after a two-year testing and validation process in 2008 and 2009:[1][2][12][13]

  • SMPTE 2019-1-2008 VC-3 Picture Compression and Data Stream Format
  • SMPTE 2019-3-2008 VC-3 Type Data Stream Mapping Over SDTI
  • SMPTE 2019-4-2009 Mapping VC-3 Coding Units into the MXF Generic Container
  • RP (Recommended Practices) 2019-2-2009 VC-3 Decoder and Bitstream Conformance

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Avid DNxHD

View on Grokipedia
from Grokipedia
Avid DNxHD (Digital Nonlinear eXtensible High Definition) is a proprietary, lossy intra-frame developed by for high-definition workflows. Introduced in 2004 and standardized by SMPTE as VC-3 in 2008, it serves as an intermediate compression format that balances high image quality with manageable file sizes and bandwidth, enabling efficient , , and multi-generational processing without significant quality degradation. Compliant with the SMPTE VC-3 standard, DNxHD is designed primarily for resolution HD video and supports both 8-bit and 10-bit color depths in 4:2:2 or 4:4:4 , making it suitable for professional applications in , , and broadcast. DNxHD was created to address the challenges of handling large volumes of HD footage in nonlinear editing systems like Avid , providing a unified for source material ingestion, proxy , and final output. Unlike distribution codecs such as H.264, which use inter-frame compression, DNxHD employs intra-frame encoding where each frame is compressed independently, facilitating and real-time playback during . It is typically wrapped in (Material Exchange Format) OP1a or .mov containers, with the being freely licensed for implementation across various hardware and software platforms, including cameras from manufacturers like . This open licensing has led to widespread adoption in collaborative environments, where DNxHD files can be edited natively without in compatible systems. The codec offers several bitrate variants to suit different workflow needs, ranging from low-bandwidth options for proxy editing to high-quality modes for mastering. Common variants include DNxHD 36 and 80 for lightweight proxies (approximately 4–10 MB/s), DNxHD 115/120 and 145 for standard 8-bit 4:2:2 editing (approximately 15–18 MB/s at 29.97 fps), and higher-end 10-bit options like DNxHD 185x and 220x (approximately 23–28 MB/s), as well as DNxHD 444 for 4:4:4 color spaces in color grading tasks. Supported frame rates include 23.976, 25, 29.97, and up to 60 fps, though storage and performance vary by variant and hardware. These options ensure DNxHD's versatility, with lower bitrates reducing storage demands— for example, a 1080p/29.97 fps stream in DNxHD LB requires about 5.39 MB/s—while maintaining near-visually lossless quality. In 2014, Avid extended the DNxHD framework with DNxHR (High Resolution), which supports resolutions beyond HD, including 2K, UHD, 4K, and up to 8K, while retaining the same core compression principles and variant structure for . DNxHD remains relevant for HD-centric projects and legacy workflows, integrated into tools like , , and camera systems for seamless media exchange. Its emphasis on efficiency and quality has made it a staple in the industry, particularly for broadcast and film finishing, where reliable performance across multi-vendor pipelines is essential.

Introduction

Definition and Purpose

Avid DNxHD is a lossy, intra-frame, developed by specifically for . As part of Avid's DNx family of codecs, it supports 8-bit and 10-bit depths with 4:2:2 or 4:4:4 (depending on the variant) to deliver broadcast-quality images while supporting efficient handling of HD content. Its intra-frame compression treats each video frame independently, enabling seamless real-time playback and without introducing temporal artifacts during manipulation. The primary purpose of DNxHD is to serve as an intermediate in professional video workflows, facilitating multi-generation , effects processing, and with minimal quality loss across repeated encoding passes. Typically wrapped in MXF OP1a containers and freely licensed for broad implementation across platforms, it optimizes resource use in demanding environments. By providing reduced storage and bandwidth requirements compared to uncompressed formats, it maintains high visual suitable for HD projects. This design ensures that workflows remain efficient, supporting non-destructive editing and easy relinking to original source media. DNxHD is targeted at systems (NLEs) within film and television , where it functions as a reliable working format for standalone editors and collaborative teams. It integrates natively with Avid's software, streamlining the transition from acquisition to final delivery in high-resolution pipelines.

Historical Development

Avid developed DNxHD in the early as a specifically designed to overcome the limitations of legacy codecs in workflows, enabling editors to handle HD material with the same ease and quality retention as standard-definition editing. This innovation addressed the increasing demands of HD adoption in and , where traditional compression methods often resulted in quality degradation or excessive storage requirements during multi-generation . The was announced at the NAB 2004 convention, with first commercial support in Avid DS Nitris systems in summer 2004, followed by integration into Avid Adrenaline with the DNxcel option in December 2004. As an intermediate for , DNxHD was optimized for Avid's hardware-accelerated systems, providing mastering-quality 8-bit or 10-bit HD media at data rates comparable to uncompressed SD. Early adoption was driven by its seamless integration with Avid's Nitris and Adrenaline hardware cards, which facilitated real-time playback and capture of HD content via standard HD-SDI connections, supporting formats like DVCPRO HD and allowing mixed-resolution timelines without compromising performance. In 2006, Avid submitted DNxHD to the Society of Motion Picture and Television Engineers (SMPTE) as the proposed framework for the VC-3 standard, undergoing a rigorous two-year review process that culminated in its approval in 2008.

Technical Details

Compression Method

Avid DNxHD utilizes a core compression algorithm based on the (DCT), which operates exclusively on intra-frames without any inter-frame prediction, ensuring each frame is encoded independently for enhanced editing flexibility in professional workflows. The DCT transforms spatial data from 8x8 pixel blocks into the , allowing efficient removal of redundancy within individual frames. The encoding process focuses on spatial compression: after applying the DCT to and components, the coefficients undergo quantization to control data reduction, followed by via Huffman tables to further compact the . This method supports both progressive and interlaced scanning formats, adapting to various broadcast and production needs while maintaining frame independence. Chroma is handled through 4:2:2 subsampling in the , which preserves sufficient color detail for high-quality video while aligning with industry standards for broadcast compatibility. The decoding process requires a simple, low-complexity implementation, facilitating real-time playback and processing on standard hardware without demanding specialized resources. DNxHD is engineered for quality preservation during multi-pass editing, employing fixed quantization tables to ensure consistent results and minimize or artifacts across repeated encode-decode cycles.

Supported Formats

Avid DNxHD primarily supports high-definition video resolutions, including 1920×1080 in both progressive (1080p) and interlaced (1080i) scan modes, as well as 1280×720 progressive (720p). It also accommodates select standard-definition resolutions, such as 720×486 for NTSC and 720×576 for PAL, allowing compatibility with legacy broadcast workflows. These formats adhere to the specifications outlined in SMPTE ST 2019-1, the standard for VC-3 picture compression, which defines the data stream for such resolutions in 8-bit and 10-bit depths with 4:2:2 chroma subsampling. The supports a variety of frame rates to match international production and broadcast requirements, including 23.976 fps, 24 fps, 25 fps, 29.97 fps, 30 fps, 50 fps, 59.94 fps, and 60 fps. Both progressive and interlaced scanning are available, with interlaced modes typically limited to at 50 Hz and 59.94 Hz, while progressive formats like extend to 60 fps. This range ensures DNxHD can handle content from film-originated projects to high-frame-rate sports broadcasts without conversion artifacts during . Bitrates scale proportionally with to maintain consistent quality. For audio, DNxHD integrates up to 16 channels of uncompressed 24-bit PCM audio at a 48 kHz sampling rate, embedded directly into the file for synchronized playback and editing. This configuration supports complex multichannel mixes, such as 5.1 surround or stereo pairs, common in professional . The audio essence follows SMPTE ST 382 for PCM streams within the MXF framework. DNxHD content is typically packaged in the (MXF) container, using the OP1a operational pattern for robust professional interchange. MXF OP1a allows seamless embedding of video, multiple audio tracks, and metadata, making it ideal for collaborative workflows in systems. This container ensures across broadcast facilities and archiving systems compliant with SMPTE ST 377-1. While versatile for HD and SD applications, DNxHD is inherently limited to resolutions at or below full HD, with no native support for higher resolutions like 2K or 4K; such capabilities require extensions beyond the core VC-3 implementation. The intra-frame compression method of DNxHD enables these formats by prioritizing edit-friendly, constant-bit-rate encoding suitable for real-time playback.

Variants and Bitrates

Avid DNxHD offers several variants designed to balance quality, file size, and performance for different production needs, with naming conventions based on approximate bitrates in Mbps for /29.97 (or /59.94) . These include LB (Low Bandwidth) at 36 Mbps, a proxy variant at 80 Mbps, SQ (Standard Quality) at 145 Mbps, HQ (High Quality) at 220 Mbps, HQX (High Quality Extended) at 220 Mbps (10-bit), and at approximately 440 Mbps. Each variant employs fixed bitrates, ensuring predictable data rates without options, which facilitates consistent storage planning in editing workflows. Bitrates scale proportionally with while maintaining compression quality levels; for example, the SQ variant delivers 145 Mbps for /29.97 but approximately 290 Mbps for /59.94. Variants differ in bit depth and chroma subsampling: LB, 80, SQ, and HQ are 8-bit 4:2:2; HQX is 10-bit 4:2:2; 444 is 10-bit 4:4:4. To aid in practical application, these bitrates translate to data rates in megabytes per second (MB/s), such as 18 MB/s for the 145 Mbps SQ variant (calculated as bitrate divided by 8 bits per byte).
VariantApproximate Bitrate (Mbps for 1080p/29.97)Bit Depth / ChromaTypical Use Case
LB (Low Bandwidth, 36)368-bit 4:2:2Archiving and low-bandwidth transfer, ideal for proxy workflows where storage and transmission efficiency are prioritized over maximum quality.
80808-bit 4:2:2Lightweight proxy editing, balancing low file sizes with acceptable quality for review and offline workflows.
SQ (Standard Quality, 145)1458-bit 4:2:2Standard editing tasks, offering a balance of quality and manageable file sizes suitable for most post-production pipelines.
HQ (High Quality, 220)2208-bit 4:2:2High-fidelity visual effects compositing and color correction, where enhanced detail retention supports demanding creative processes.
HQX (High Quality Extended, 220)22010-bit 4:2:2Advanced VFX and grading requiring 10-bit precision, providing high dynamic range while remaining intra-frame for edit-friendly performance.
44444010-bit 4:4:4Color grading and finishing in RGB workflows, preserving full chroma detail for professional mastering.
In terms of performance metrics, storage requirements vary by variant and duration; for instance, one hour of 1080p/29.97 footage in SQ format requires approximately 65 GB, derived from the 18 MB/s data rate over 3,600 seconds (18 MB/s × 3,600 = 64,800 MB or 65 GB). This fixed-rate structure supports reliable planning for shared storage environments in professional editing suites. The 2025 revision of SMPTE ST 2019-1 incorporates extensions previously known as DNx GX into the core VC-3 definition.

Standardization and Compatibility

SMPTE VC-3 Standard

Avid submitted its DNxHD to the Society of Motion Picture and Television Engineers (SMPTE) in 2006 as the foundational framework for the VC-3 family of standards, which underwent a two-year testing and validation process before approval in 2008. Full compliance of DNxHD with the VC-3 standard was officially announced on February 13, 2008, marking it as the first to achieve this milestone. The VC-3 standard is formally defined in SMPTE ST 2019-1:2008, published in 2008, which specifies an intra-frame (DCT) compression method optimized for high-definition (HD) video essence. This standard outlines the compressed data format and decoding process for VC-3, supporting a wide range of resolutions up to 16384 × 16384 pixels, originally designed for high-definition (HD) video up to with low-complexity encoding suitable for real-time processing in professional workflows. Key features include the definition of picture essence in 8-bit 4:2:2 YCbCr , integration with MXF () for wrapping, and requirements for interoperability across compliant systems. Subsequent compliance updates ensured alignment with evolving VC-3 specifications; for instance, revisions in v4.0 brought the DNxHD implementation into full conformance with the standard by January 2009. The standard received a significant revision in 2025 as SMPTE ST 2019-1:2025, incorporating elements previously associated with DNx GX—such as enhanced compression profiles—directly into the core VC-3 definition to broaden its applicability. In November 2024, SMPTE published ST 2067-70:2024, specifying the application of VC-3 within the IMF framework to facilitate multi-platform content delivery. Standardization as VC-3 provides critical benefits by promoting vendor-neutral adoption of the beyond proprietary Avid ecosystems, facilitating seamless exchange of HD media files in collaborative production environments worldwide.

Implementations and Support

Avid DNxHD serves as a core within Avid's native software ecosystem, integrated into since its introduction in 2004 for high-resolution editing, transcoding, and proxy workflows. It is also fundamentally supported in Avid for finishing tasks, such as reassembly and output in formats like UHD and HD, and in the DS Nitris system for handling high-resolution media. for real-time playback of DNxHD material is enabled through Nitris DX cards, which enhance performance in demanding editing environments. Third-party software provides native decoding for DNxHD, facilitating interoperability in professional workflows. supports DNxHD in both MXF and wrappers, allowing seamless import and export for editing. includes comprehensive support for various DNxHD variants, such as 444 and profiles at 8-bit depth, within MXF OP-Atom containers. offered DNxHD decoding via plugins prior to , with built-in support since version 10.4 and continuing in subsequent versions for compatibility with Avid workflows. FFmpeg enables both encoding and decoding of DNxHD streams, standardized as SMPTE VC-3, since version 0.5 released in 2009. DNxHD is compatible with professional capture and playback hardware, enabling efficient encode and decode operations in broadcast and settings. AJA devices, such as the Ki Pro Mini and Ki Pro Ultra recorders, support DNxHD recording in formats including HQX (220x), SQ (145), and LB (36). hardware, including the HyperDeck Studio, facilitates DNxHD recording and playback in MXF format for direct integration with Avid systems. Grass Valley systems, like the Summit with K2-XDP2 codec boards, handle DNxHD for both input encoding and output decoding across supported resolutions. In file handling, DNxHD is predominantly used within MXF containers for broadcast workflows, supporting linking, consolidation, and export while preserving in Avid MediaFiles/MXF folders. Early implementations also provided (.mov) export options for audio-video integration and compatibility with external applications like After Effects. DNxHD operates cross-platform on Windows, macOS, and through Avid SDKs and tools like FFmpeg, with the VC-3 standard contributing to its broad ecosystem compatibility. However, support remains limited in mobile devices and consumer-grade applications due to hardware and licensing constraints.

Evolution and Extensions

Introduction of DNxHR

DNxHR, short for Digital Nonlinear Extensible High Resolution, was introduced by Avid on September 14, 2014, during a at Avid Connect Europe in , as an extension of the DNxHD family designed specifically to handle resolutions exceeding high definition (HD). This announcement addressed the growing demand for higher-resolution workflows in , enabling seamless editing of content up to ultra-high definition (UHD) and 4K formats without compromising performance. Building briefly on DNxHD's foundational role as an efficient intra-frame for HD editing, DNxHR extends this capability to support modern production needs like 2K, 4K, and beyond. Key enhancements in DNxHR include support for 10-bit and 12-bit color depths, accommodating resolutions such as 4096×2160 (DCI 4K) and UHD (3840×2160), while retaining the same DCT-based intra-frame compression method as DNxHD for visually lossless quality and low computational overhead during . This compression approach ensures each frame is independently encoded, facilitating multi-generation workflows in systems like Avid . The primary purpose of DNxHR is to streamline 2K and 4K pipelines, allowing editors to ingest, transcode, and manipulate high-resolution media efficiently without the performance bottlenecks associated with uncompressed or lightly compressed formats. DNxHR offers several variants tailored to different quality and bandwidth requirements: HQX at approximately 440 Mbps for 4K at 24 fps (12-bit 4:2:2, high-quality mastering), HQ at 275 Mbps for 4K at 24 fps (10-bit 4:2:2, balanced production use), LB at around 110 Mbps for 4K at 24 fps (8-bit 4:2:2, low-bandwidth proxy or ), and the variant for RGB or full-chroma workflows with 12-bit depth to preserve color accuracy in and . These options provide flexibility for storage and processing constraints while maintaining edit-friendly characteristics. Additionally, DNxHR ensures by allowing HD encodes under the "DNxHR HD" label, which mirrors the quality and performance of traditional DNxHD files for legacy workflows.

Recent Updates and Adoption

In 2019, Apple announced native support for both DNxHD and DNxHR codecs in macOS through its free Pro Video Formats package, providing 64-bit decoders to ensure compatibility in professional workflows. This update addressed earlier concerns about codec deprecation in macOS transitions, maintaining seamless integration for users of Avid software on Apple hardware. A significant advancement came in 2024 with the publication of SMPTE ST 2067-70, which standardizes the use of the VC-3 codec (underlying DNxHD) within the Interoperable Master Format (IMF) framework. Developed through a collaboration between SMPTE, Avid, and the Digital Production Partnership (DPP), this standard enables efficient, high-quality delivery of VC-3 content across multiple platforms while reducing needs and supporting constant options for archiving and distribution. In 2025, SMPTE revised ST 2019-1 to integrate features of the DNx GX variant—previously a specialized RGB(A) mode for green screen compositing—directly into the core VC-3 specification, enhancing flexibility for visual effects workflows without requiring separate implementations. DNxHD has seen widespread adoption in Hollywood post-production, serving as a reliable intermediate codec in Avid-based timelines for major films edited with Avid Media Composer. It has become a standard for broadcast delivery due to its predictable file sizes and compliance with industry mastering requirements, as well as for long-term archiving in MXF-wrapped OP1a formats that preserve audio, video, and metadata integrity. Current trends reflect a shift toward DNxHR for 4K and higher-resolution projects, while DNxHD continues to dominate as an efficient proxy format for HD workflows, particularly in resource-constrained environments. Integration with cloud-based platforms like Avid MediaCentral further supports remote , allowing DNxHD assets to be shared and processed across distributed teams. The adherence to the SMPTE VC-3 standard has bolstered DNxHD's longevity, mitigating risks from platform-specific changes such as Apple's 2018 QuickTime framework deprecations that initially threatened third-party codec support. This ensures ongoing compatibility and positions DNxHD as a option in evolving media ecosystems, even as extensions like DNxHR handle emerging high-resolution demands.

References

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