[FFmpeg-trac] #6907(avcodec:open): hevc decoding regression

FFmpeg trac at avcodec.org
Thu Mar 4 15:36:16 EET 2021

#6907: hevc decoding regression
             Reporter:  Evgeniy1990  |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  hevc         |               Blocked By:
  regression                         |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |

Comment (by jamrial):

 Replying to [comment:2 Balling]:
 > This is not a RAW video file. It is Annex B HEVC. This is a very strange
 issue. Not only everything is zero out on HEVC profile and tier and no
 info about progressive stuff in VPS and SPS; there is 3 sub layers... Now
 the problem (and regression) with SPS is that it says "Invalid value of
 delta_poc: -2", and there is indeed one in SPS. Maybe this thing should be
 unsigned, you know.

 Making it unsigned will not change the fact the coded value is wrong. It
 should be between 0 and 32767, yet it's 4294967293 in the bitstream.
 So changing the type and adapting the error check will still make it fail.
 The only "solution" would be to remove the check altogether and allow out
 of range values again.

Ticket URL: <https://trac.ffmpeg.org/ticket/6907#comment:3>
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