#8959: [ffmpeg][avc/hevc encode][regression]A commit caused all avc/hevc encode
cases in ffmpeg-vaapi fail!
-------------------------------------+-------------------------------------
             Reporter:  yefeng       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  critical     |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  vaapi        |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by JEEB):

 {{{
 [Parsed_scale_0 @ 0x3585ec0] w:320 h:240 fmt:yuv420p sar:0/1 -> w:320
 h:240 fmt:nv12 sar:0/1 flags:0x4
 [h264_vaapi @ 0x3577e40] range: tv, primaries: unknown, trc: unknown,
 colorspace: unknown, chroma sample location: unspecified
 }}}

 So swscale specifically notes that it is limited range, which is why
 vf_scale appears to set that value to the AVFrame, and thus that is the
 only field set in the AVFrame as there is no further color information
 available.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8959#comment:2>
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