FFV1: Difference between revisions
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* Technical Description: http://www.ffmpeg.org/~michael/ffv1.html | * Technical Description: http://www.ffmpeg.org/~michael/ffv1.html | ||
FFV1 | The FFV1 video codec is a simple and efficient lossless intra-frame only codec. | ||
Multiple version of the codec are available. ([[User:Lu zero|lu_zero]] Describe only version 2?) | |||
= Bitstream = | |||
== Conventions == | |||
([[User:Lu zero|lu_zero]] Put a table with the description symbol and such) | |||
== Bitstream structure == | |||
FFV1 consts of a global header and frames. Frames are structured in header and slices. | |||
The headers store information regarding encoding type, pixel format and slice geometry. | |||
Depending on the version most of it is stored in the global header or in the per-frame header. | |||
=== Global Header === | |||
Version 1 does not have a global header, from version 2 the following field compose the global header. | |||
([[User:Lu zero|lu_zero]] Make a table) | |||
* version | |||
* minor version | |||
* coder type | |||
* state transition table | |||
* colorspace type | |||
* bits per sample | |||
* chroma_planes | |||
* horizontal subsampling | |||
* vertical subsampling | |||
* alpha plane presence | |||
* number of horizontal slices | |||
* number of vertical slices | |||
* quantization tables | |||
* error correction | |||
* cyclic redundancy check | |||
=== Frame === | |||
Each frame is composed by a small header and the frame data in slices. | |||
Version 0 and 1 use a larger per frame header, version 2 and later store | |||
only the initial 1bit Range Coded keyframe flag. | |||
Depending on the version the slice data provides additional information, | |||
a specific quantization table and a redundancy check. | |||
==== Frame Header ==== | |||
Version 0 and 1 use a large per frame header, version 2 and later store | |||
only the initial 1bit Range Coded keyframe flag. | |||
==== Slice ==== | |||
Version 2 slice has the following structure | |||
= Encoding = | |||
== Encoding modes == | |||
=== Range coding === | |||
=== Huffman coding === | |||
== Frame Encoding == | |||
=== Colorspace === | |||
=== Prediction === | |||
=== Quantization === | |||
= Common usage = | |||
[[Category:Lossless Video Codecs]] | [[Category:Lossless Video Codecs]] | ||
[[Category:Video Codecs]] | [[Category:Video Codecs]] | ||
[[Category:Video FourCCs]] | [[Category:Video FourCCs]] |
Latest revision as of 07:54, 27 October 2012
- FOURCCs: FFV1
- Technical Description: http://www.ffmpeg.org/~michael/ffv1.html
The FFV1 video codec is a simple and efficient lossless intra-frame only codec.
Multiple version of the codec are available. (lu_zero Describe only version 2?)
Bitstream
Conventions
(lu_zero Put a table with the description symbol and such)
Bitstream structure
FFV1 consts of a global header and frames. Frames are structured in header and slices. The headers store information regarding encoding type, pixel format and slice geometry. Depending on the version most of it is stored in the global header or in the per-frame header.
Global Header
Version 1 does not have a global header, from version 2 the following field compose the global header.
(lu_zero Make a table)
- version
- minor version
- coder type
- state transition table
- colorspace type
- bits per sample
- chroma_planes
- horizontal subsampling
- vertical subsampling
- alpha plane presence
- number of horizontal slices
- number of vertical slices
- quantization tables
- error correction
- cyclic redundancy check
Frame
Each frame is composed by a small header and the frame data in slices. Version 0 and 1 use a larger per frame header, version 2 and later store only the initial 1bit Range Coded keyframe flag. Depending on the version the slice data provides additional information, a specific quantization table and a redundancy check.
Frame Header
Version 0 and 1 use a large per frame header, version 2 and later store only the initial 1bit Range Coded keyframe flag.
Slice
Version 2 slice has the following structure