On 12/28/2020 03:01 PM, Mark Filipak (ffmpeg) wrote:
-snip-> Thank you, Paul. I still see one small problem (which may be in the 
source) which I'd like to
pursue, but the 2 major faults are now gone. Congratulations!

ffmpeg -report -i preprocessed.mkv -i source.mkv -filter_complex "decimate='ppsrc=1':dupthresh=1.0" "target dupthresh=1.0.mkv" ffmpeg -report -i preprocessed.mkv -i source.mkv -filter_complex "decimate='ppsrc=1':dupthresh=1.5" "target dupthresh=1.5.mkv"

I performed a careful review, below, using the latest build. Note that decimate=ppsrc=1 removes the 2nd of the repeat-pair except for the first instance (frames 938 & 939). In the first instance, the the 1st of the repeat-pair is removed. That bothers me a bit. I anticipated that the first frame of 'target dupthresh=1.0.mkv' & 'target dupthresh=1.5.mkv' would be frame 938. That it's 939 makes me wonder about ppsrc's initialization.

 'source.mkv' frame numbers
  |          'target dupthresh=1.0.mkv' frame numbers
  |           |    'target dupthresh=1.5.mkv' frame numbers
  |           |     |
 938
 939 repeat  939   939
 940         940   940
 941 combed  941   941
 942 combed  942   942
 943         943   943
 944 repeat
 945         945   945
 946 combed  946   946
 947 combed  947   947
 948         948   948
 949 repeat
 950         950   950
 951 combed  951   951
 952 combed  952   952
...etc.

How do I know it was frame 938 that was removed? Because the frame numbers are 
burned into 'source.mkv'.
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