[FFmpeg-trac] #9680(undetermined:new): scale2ref is one frame behind

[FFmpeg]

#9680: scale2ref is one frame behind
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             Reporter:  Jozef        |                    Owner:  (none)
  Chutka                             |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Elon Musk):

 Adding 1 or 2 null filters at right spot fixes issue for me:


 ffplay -f lavfi -i
 "color=color=#000000:rate=25:size=400x400,format=yuv444p,setpts=N[b];color=color=#ffffff:rate=25:size=100x100,format=yuv444p,scale=width=iw+n:height=ih+n:eval=frame[w];color=color=#ff0000:rate=25,format=yuv444p[r];[r][w]scale2ref=eval=frame[r][w];[w]null[w];[r]null[r];[w][r]overlay=format=auto,setpts=N[w];[b][w]overlay=format=auto"
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Ticket URL: <https://trac.ffmpeg.org/ticket/9680#comment:2>
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