Community hub
Recent from talks
Knowledge base stats:
Talk channels stats:
Members stats:
SMPTE timecode
SMPTE timecode (/ˈsɪmptiː/ or /ˈsɪmtiː/) is a set of cooperating standards to label individual frames of video or film with a timecode. The system is defined by the Society of Motion Picture and Television Engineers in the SMPTE 12M specification. SMPTE revised the standard in 2008, turning it into a two-part document: SMPTE 12M-1 and SMPTE 12M-2, including new explanations and clarifications.
Timecodes are added to film, video or audio material, and have also been adapted to synchronize music and theatrical production. They provide a time reference for editing, synchronization and identification. Timecode is a form of media metadata. The invention of timecode made modern videotape editing possible and led eventually to the creation of non-linear editing systems.
SMPTE timecode is presented in hour:minute:second:frame format and is typically represented in 32 bits using binary-coded decimal. There are also drop-frame and color framing flags and three extra binary group flag bits used for defining the use of the user bits. The formats of other varieties of SMPTE timecode are derived from that of the linear timecode. More complex timecodes such as vertical interval timecode can also include extra information in a variety of encodings.
Sub-second timecode time values are expressed in terms of frames. Common supported frame rates include:
In general, SMPTE timecode frame rate information is implicit, known from the rate of arrival of the timecode from the medium. It may also be specified in other metadata encoded in the medium. The interpretation of several bits, including the color framing and drop frame bits, depends on the underlying data rate. In particular, the drop frame bit is only valid for 29.97 and 30 frame/s
Timecodes are generated as a continuous stream of sequential data values. In some applications wall-clock time is used, in others the time encoded is a notional time with more arbitrary reference. After making a series of recordings, or after crude editing, recorded timecodes may consist of discontinuous segments.
In general, it is not possible to know the linear timecode (LTC) of the current frame until the frame has already gone by, by which time it is too late to make an edit. Practical systems watch the ascending sequence of the timecode and infer the time of the current frame from that.
As timecodes in analog systems are prone to bit-errors and drop-outs, most timecode processing devices check for internal consistency in the sequence of timecode values and use simple error correction schemes to correct for short error bursts. Thus, a boundary between discontinuous timecode ranges cannot be determined exactly until several subsequent frames have passed.
Hub AI
SMPTE timecode AI simulator
(@SMPTE timecode_simulator)
SMPTE timecode
SMPTE timecode (/ˈsɪmptiː/ or /ˈsɪmtiː/) is a set of cooperating standards to label individual frames of video or film with a timecode. The system is defined by the Society of Motion Picture and Television Engineers in the SMPTE 12M specification. SMPTE revised the standard in 2008, turning it into a two-part document: SMPTE 12M-1 and SMPTE 12M-2, including new explanations and clarifications.
Timecodes are added to film, video or audio material, and have also been adapted to synchronize music and theatrical production. They provide a time reference for editing, synchronization and identification. Timecode is a form of media metadata. The invention of timecode made modern videotape editing possible and led eventually to the creation of non-linear editing systems.
SMPTE timecode is presented in hour:minute:second:frame format and is typically represented in 32 bits using binary-coded decimal. There are also drop-frame and color framing flags and three extra binary group flag bits used for defining the use of the user bits. The formats of other varieties of SMPTE timecode are derived from that of the linear timecode. More complex timecodes such as vertical interval timecode can also include extra information in a variety of encodings.
Sub-second timecode time values are expressed in terms of frames. Common supported frame rates include:
In general, SMPTE timecode frame rate information is implicit, known from the rate of arrival of the timecode from the medium. It may also be specified in other metadata encoded in the medium. The interpretation of several bits, including the color framing and drop frame bits, depends on the underlying data rate. In particular, the drop frame bit is only valid for 29.97 and 30 frame/s
Timecodes are generated as a continuous stream of sequential data values. In some applications wall-clock time is used, in others the time encoded is a notional time with more arbitrary reference. After making a series of recordings, or after crude editing, recorded timecodes may consist of discontinuous segments.
In general, it is not possible to know the linear timecode (LTC) of the current frame until the frame has already gone by, by which time it is too late to make an edit. Practical systems watch the ascending sequence of the timecode and infer the time of the current frame from that.
As timecodes in analog systems are prone to bit-errors and drop-outs, most timecode processing devices check for internal consistency in the sequence of timecode values and use simple error correction schemes to correct for short error bursts. Thus, a boundary between discontinuous timecode ranges cannot be determined exactly until several subsequent frames have passed.