Can you post a link to a short MKV that shows the issue?
If it is soft 3:2 as you say, probably FFVideoSource() is not honoring the pulldown flags. IIRC, it doesn't by default and you need to specify an option (IIRC, rffmode=1). Ignoring the flags is a form of deinterlacing.
Also, ignoring flags can hurt AV sync if it is not pure soft 3:2 throughout. That may account for your time discrepancies.
I don't know if it is true, but there are reports rffmode=1 is buggy. Maybe safer to use a source filter that is known to be reliable in its pulldown handling, such as Mpeg2Source() or DGSource().
Last edited by videoh; 4th May 2020 at 17:10.
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