[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
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             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           |
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Comment (by jkqxz):

 To make clearer that other platforms are fine:
 {{{
 $ ./ffmpeg_g -v 0 -y -i hang.vid out_sw.yuv
 $ ./ffmpeg_g -v 0 -y -hwaccel vaapi -hwaccel_device /dev/dri/renderD129 -i
 hang.vid -vf format=yuv420p out_amd.yuv
 libva info: VA-API version 0.40.0
 libva info: va_getDriverName() returns 0
 libva info: Trying to open /usr/local/lib/dri/radeonsi_drv_video.so
 libva info: Found init function __vaDriverInit_0_40
 libva info: va_openDriver() returns 0
 $ ls -l out_*.yuv
 -rw-r--r-- 1 mrt mrt 388454400 Sep  8 20:23 out_amd.yuv
 -rw-r--r-- 1 mrt mrt 388454400 Sep  8 20:23 out_sw.yuv
 $ cmp out_sw.yuv out_amd.yuv
 $
 }}}
 i.e. output is bit-identical, so VAAPI is not the problem.

 Then:
 {{{
 $ ./ffmpeg_g -v 0 -y -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -i
 hang.vid -vf format=yuv420p out_intel.yuv
 libva info: VA-API version 0.40.0
 libva info: va_getDriverName() returns 0
 libva info: Trying to open /usr/local/lib/dri/i965_drv_video.so
 libva info: Found init function __vaDriverInit_0_40
 libva info: va_openDriver() returns 0
 }}}
 and the GPU hangs immediately.

 (renderD128 is an Intel Skylake GT2, renderD129 is an AMD Polaris 11.)

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Ticket URL: <https://trac.ffmpeg.org/ticket/6642#comment:3>
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