I'm dealing with an NTSC DVD of a film shot in a PAL country, using avisynth. All the frames are blended. I tried Yadif(order=-1, mode=1) srestore() which does bring it down to 25FPS, but there's frame skipping and some ghosting. I've tried order=1 in yadif but it doesn't help.
I'd like at least to get rid of the interlacing and the frame skipping; ideally, the ghosting should go, too
Here are two examples. The "vanilla" doesn't have any treatment done to it, and the "yadif srestore" one has the lines above.
Note: I also tried tried tfm()TDecimate() just in case, to bring it to 23.976, but I get the same problems.
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Given you sample is interlaced video but overcompressed in progressive mode:
AssumeTFF() Yadif(mode=1) # or better: QTGMC() SRestore(frate=25)
Thanks a bunch! Yes, that's much better. Still a little bit of ghosting, but nothing too terrible.
I don't really understand what AssumeTFF() does, though. The avisynth page is a bit cryptic to me:
AssumeTFF and AssumeBFF let you tell AviSynth what you believe the field order a clip has.
They do not change the actual field order, just the internal state flags in AviSynth relating to the source clip used.
Last edited by bruno321; 6th Oct 2018 at 04:47.
Put on your bobber alone. Yadif(Mode=1), QTGMC, whatever. Find a place with steady movement and play it. I use VDub and the right-arrow key for these things. If it plays smoothly, you're okay and can put on SRestore. If it plays with a herky-jerky back-and-forth motion, the field order is incorrect and then you (usually) put on AssumeTFF (Assume Top Field First) before the bobber. Test again and then put on SRestore.
The field order has to be correct or the unblending will fail. As you discovered. And just because you need AssumeTFF for the sample doesn't necessarily mean you need it for the complete video. In cutting it you might have reversed the field order. Always test with the bobber alone first.
For determining field order I always use this:
Step through the resulting video, field-by-field. If the motion looks normal, the video is top field first. However, if the motion goes backwards and forwards ("two steps forward, one step back"), then field order is BFF. The other suggestions will probably work as well, but I've been doing it this way for a long time and feel that it is really hard for me to screw this up (which I seem to do a lot).