[FFmpeg-trac] #7687(avcodec:new): h264_omx can stall due to not handling fragmented frames correctly

[FFmpeg]

#7687: h264_omx can stall due to not handling fragmented frames correctly
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             Reporter:  6by9           |                    Owner:
                 Type:  defect         |                   Status:  new
             Priority:  normal         |                Component:  avcodec
              Version:  git-master     |               Resolution:
             Keywords:  h264_omx, omx  |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
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Comment (by 6by9):

 > Isn’t this a duplicate of ticket #6586?

 No. #6586 is the zerocopy path of h264_omx passing a pointer into IL that
 has issues in VCHIQ
 The buffer is allocated by V4L2, mmaped into userspace results with flags
 VM_IO and/or VM_PFNMAP. VCHIQ then tries to pass that to the GPU on behalf
 of IL and get_user_pages fails.
 https://github.com/raspberrypi/firmware/issues/851
 I'm 99.9% certain that is a VCHIQ kernel driver issue - FFmpeg is in the
 clear.

 This issue is FFmpeg mishandling fragmented buffers on the output side.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7687#comment:3>
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