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| * FOURCCs: FFV1 | | * FOURCCs: FFV1 |
| * Technical Description: [http://www1.mplayerhq.hu/~michael/ffv1.html http://www1.mplayerhq.hu/~michael/ffv1.html] | | * Technical Description: http://www.ffmpeg.org/~michael/ffv1.html |
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| FFV1 stands for [[FFmpeg]] codec #1. It is an experimental codec that features lossless, intraframe-only, arithmetic coding. | | The FFV1 video codec is a simple and efficient lossless intra-frame only codec. |
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| [[Category:Lossless Video Codecs]] | | Multiple version of the codec are available. ([[User:Lu zero|lu_zero]] Describe only version 2?) |
| [[Category:Video Codecs]] | | |
| [[Category:Video FourCCs]] | | = 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 |
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| | * coder type |
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| | * state transition table |
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| | * colorspace type |
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| | * bits per sample |
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| | * chroma_planes |
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| | * horizontal subsampling |
| | * vertical subsampling |
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| | * alpha plane presence |
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| | * number of horizontal slices |
| | * number of vertical slices |
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| | * quantization tables |
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| | * error correction |
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| | * cyclic redundancy check |
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| | === 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. |
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| | ==== Frame Header ==== |
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| |
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| | Version 0 and 1 use a large per frame header, version 2 and later store |
| | only the initial 1bit Range Coded keyframe flag. |
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| |
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| | ==== Slice ==== |
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| | Version 2 slice has the following structure |
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| | = Encoding = |
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| | == Encoding modes == |
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| | === Range coding === |
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| | === Huffman coding === |
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| | == Frame Encoding == |
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| | === Colorspace === |
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| | === Prediction === |
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| | === Quantization === |
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| <div style="display:none">
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| </div>
| | [[Category:Lossless Video Codecs]] |
| | [[Category:Video Codecs]] |
| | [[Category:Video FourCCs]] |