[FFmpeg-trac] #9805(ffplay:new): Gray frames while decoding when HEVC codec is used and frames with missing POC reference exist

[FFmpeg]

#9805: Gray frames while decoding when HEVC codec is used and frames with missing
POC reference exist
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             Reporter:  dhirendvs  |                     Type:  defect
               Status:  new        |                 Priority:  normal
            Component:  ffplay     |                  Version:  git-master
             Keywords:             |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
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 **bold**Summary of the bug:**bold**
 When a H265 .mp4 file contains missing/corrupt frames, and this file is
 decoded for playback using the HEVC codec, gray frames are visible in case
 of frames with missing POC reference i.e. when the error "Could not find
 ref with POC XX" is displayed.

 However, when the HEVC Intel Quick Sync codec is used, gray frames are not
 visible in case of the instances of the missing POC reference error, but a
 much better playback result is generated with only 3 instances of garbled
 frames.

 Is this because HEVC Intel Quick Sync codec decodes frames with a non-zero
 latency whereas the latency is 0 in case of the default HEVC codec? Is it
 possible to produce a similar result without gray frames when the default
 HEVC codec is used for playback of such a file with missing/corrupt
 frames?

 **bold**How to reproduce:**bold**
 A) Gray frames:
 ffplay -vcodec hevc H265.mp4

 B) Garbled frames in a few instances but no gray frames:
 ffplay -vcodec hevc_qsv H265.mp4

 **bold**Built on:**bold**
 FFmpeg 5.0
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Ticket URL: <https://trac.ffmpeg.org/ticket/9805>
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