[FFmpeg-trac] #7200(avcodec:open): Assertion failure with h264_metadata bsf

[FFmpeg]

#7200: Assertion failure with h264_metadata bsf
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             Reporter:  mypopy      |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Comment (by mkver):

 The H264 bitstream contains 00 00 00 01 00 00 00 01; the second start code
 starts a real NAL unit, but the first one is empty after the trailing
 zeros have been stripped away as is done in cbs_h2645_fragment_add_nals.
 In the very same function there is also an assert that the size after
 stripping away trailing zeros is still >0 (which is of course what
 triggers this assertion failure).
 If one simply remuxes to mkv/mp4, the file really contains a NAL unit of
 size zero. Is this even legal H264 in mp4/mkv?

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Ticket URL: <https://trac.ffmpeg.org/ticket/7200#comment:3>
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