[FFmpeg-trac] #9797(undetermined:open): Matroska container doesn't write h264 extdata with a pcm_s16le input

[FFmpeg]

#9797: Matroska container doesn't write h264 extdata with a pcm_s16le input
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             Reporter:  Reboot       |                    Owner:  (none)
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  pcm_s16le    |               Blocked By:
  libx264                            |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by mkver):

 The Matroska muxer correctly writes the extradata. But somehow the video
 packet is only ever sent to the muxer after all the audio packets, so that
 it is written after many audio packets (near audio packets with timestamp
 1:50); it is therefore not found by avformat_find_stream_info, leading to
 the warning about missing pixel format. Said pixel format is only inferred
 by libavformat when a packet is decoded, although it could be inferred
 from the extradata alone (if one is willing to presume that the extradata
 will not be overwritten by new in-band extradata lateron).

 So the issue is somewhere else, either in the ffmpeg cli program or in
 libavfilter I presume.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9797#comment:2>
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