[FFmpeg-trac] #1909(FFmpeg:new): Add support for skipping a header for rawvideo inputs

[FFmpeg]

#1909: Add support for skipping a header for rawvideo inputs
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             Reporter:  erezst  |                     Type:  enhancement
               Status:  new     |                 Priority:  normal
            Component:  FFmpeg  |                  Version:  unspecified
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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 Some programs dump uncompressed video files with a custom header at the
 beginning. To use these files as inputs for FFMPEG, the rawvideo codec
 needs to be able to skip this header.

 The input format is:
     [ Header - e.g. 100 bytes]
     [ Frame #1 ]
     [ Frame #2 ]
     [ ... ]
     [ Frame #N ]

 Header -- a fixed-length header (for example, 100 bytes).
 Frame - A raw video frame in some pix_fmt (e.g. YUV422p).

 A command-line for encoding this file to H.264 might be:

 ffmpeg -vcodec rawvideo -f rawvideo -pix_fmt yuv422p -skipheader 100 -i
 <SOURCE_VIDEO> -s 640x480 -r 30 -vcodec libx264 <OUTPUT_FILE>

 The '-skipheader 100' parameter is what this feature request is about.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1909>
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