[FFmpeg-trac] #3900(avformat:new): ff_check_h264_startcode does not support 3-byte startcodes

[FFmpeg]

#3900: ff_check_h264_startcode does not support 3-byte startcodes
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             Reporter:  Lastique  |                    Owner:
                 Type:  defect    |                   Status:  new
             Priority:  normal    |                Component:  avformat
              Version:  2.3       |               Resolution:
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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Comment (by cehoyos):

 Replying to [ticket:3900 Lastique]:
 > The 3-byte startcode is produced by libx264 for SEI NAL. Our application
 uses libx264 and ffmpeg through C API and at some point passes an AVPacket
 that starts with SEI to av_interleaved_write_frame, which fails.

 This seems to describe a different failure than the one for which you
 uploaded a sample and provided a command line. Is the issue with using
 libx264 to encode and libavformat to mux not reproducible with
 {{{ffmpeg}}} (the application)?

 I tested your patch and the file you uploaded: The patch allows to write
 invalid transport streams with {{{ffmpeg -i ticket3900.avi​ -vcodec copy
 out.ts}}} which could be fixed by moving the changed function to
 libavformat/avienc.c but neither the original file nor the (with your
 patch) remuxed avi file play with WMP, so I suspect the error message is
 not wrong or do I miss something?

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Ticket URL: <https://trac.ffmpeg.org/ticket/3900#comment:3>
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