Doom9's Forum - View Single Post - MKVToolNix seems to "auto" decimate soft-telecined DVD source?

videoh · 4th May 2020, 14:06

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().

4th May 2020, 14:06	#8 \| Link
videoh Useful n00b Join Date: Jul 2014 Posts: 1,667	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.