[FFmpeg-trac] #6642(ffmpeg:new): GPU hang in decoding hevc video by using ffmpeg

[FFmpeg]

#6642: GPU hang in decoding hevc video by using ffmpeg
------------------------------------+----------------------------------
             Reporter:  hsyrja      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  ffmpeg
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+----------------------------------

Comment (by hsyrja):

 From Libya team.

 I saw lots of error messages when using a tool to parse hang.vid
 I can't reproduce this issue with gstreamer-vaapi, it seems ffmpeg and
 gstreamer handle the element errors in different way so they pass
 different picture parameters and slice parameters to the driver. You may
 enable VA tracer by setting LIBVA_TRACE in your environment then check the
 tracer log.
 e.g. in gstreamer

 [48642.979908][ctx 0x02000000] pcm_sample_bit_depth_luma_minus1 = 0
 [48642.979909][ctx 0x02000000] pcm_sample_bit_depth_chroma_minus1 = 0
 ...
 [48642.979952][ctx 0x02000000] slice_parsing_fields = 15246

 however in FFmpeg

 [48794.782034][ctx 0x02000000] pcm_sample_bit_depth_luma_minus1 = 255
 [48794.782034][ctx 0x02000000] pcm_sample_bit_depth_chroma_minus1 = 255
 ...
 [48794.782054][ctx 0x02000000] slice_parsing_fields = 910

 According to the tracer log, I think this is a FFmpeg specific issue.

 driver(HW) provides error handling, but it can't cover all of errors.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6642#comment:1>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker