[FFmpeg-trac] #7644(undetermined:closed): print warning for "-c:v copy" + "-ss non-key-frame"

[FFmpeg]

#7644: print warning for "-c:v copy" + "-ss non-key-frame"
-------------------------------------+-------------------------------------
             Reporter:  hanshenrik   |                    Owner:
                 Type:  enhancement  |                   Status:  closed
             Priority:  wish         |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |  needs_more_info
Analyzed by developer:  0            |               Blocked By:
                                     |  Reproduced by developer:  0
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Comment (by hanshenrik):

 Replying to [comment:5 cehoyos]:
 > Without an example for ''black/random-color frames'' I don't think this
 is a valid ticket.
 > (There is at least one codec for which it does happen, but this is a
 known and reported bug for this codec, not something unavoidable.)

 there is a real example in #7640

 youtube-dl 'https://www.youtube.com/watch?v=PojTP32lE_o' -o in.mkv -q
 2>/dev/null

 ffmpeg -i "in.mkv" -c:v copy -c:a copy  -ss 00:11:32 -t 10.8 -y test.mkv

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Ticket URL: <https://trac.ffmpeg.org/ticket/7644#comment:6>
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