[FFmpeg-user] ffmpeg architecture question

Mark Filipak markfilipak.windows+ffmpeg at gmail.com
Fri Apr 17 16:30:30 EEST 2020

I reran the tests with these command lines:


ffmpeg -i %1 -filter_complex 
-map 0 -c:v libx264 -crf 20 -an -sn "C:\AVOut\FOO-GH.MKV"


ffmpeg -i %1 -filter_complex 
-map 0 -c:v libx264 -crf 20 -an -sn "C:\AVOut\FOO-HG.MKV"

The datascope doesn't appear in either output, so frame 1 (zero-based) is not traversing [E][H] 
(upper command) or [E][G] (lower command).

Therefore, I'm pretty confident that once frame 1 gets enqueued at [C], the filter chain is not 

Another interesting thing is the behavior of 'blend'.

If blend gets a hit to its 2nd input (but not the 1st) the total frames output = 479.

If blend gets a hit to its 1st input (but not the 2nd) the total frames output = 594.

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