[MEncoder-users] inverse telecine with 60 fps progressive video

Scott W. Larson scowl at pacifier.com
Thu Apr 7 08:53:47 CEST 2005

I'm having difficulty getting a filter to correctly inverse telecine 60 
fps progressive material that has been damaged by reception problems and 
edits with the new EDL code. In all cases -fps is set to 59.94 and -ofps 
is set to 23.976.

filmdint works perfectly on perfect material but often when the 3:2 
pattern is lost, it does the worst thing possible by getting the 3:2 
pattern backwards. That means it pulls the first and last frames from 
the three frame sequence and completely skips the two frame sequence 
leaving me with 12 fps video. It will continue to do this until another 
break in the pattern somehow causes it to start working again. Verbose 
mode shows that it's correctly recognizing the duplicate frames (the sad 
values are all zero for those frames) but it never realizes it's doing 
it all wrong. The options I'm using are: 

pullup+softskip (the latest version in CVS) also works perfectly on 
perfect material with strict breaks set to 1. It even does somewhat 
better with the troublesome pattern breaks but it still doesn't 
completely recover. It often bounces back and forth every few seconds 
from pulling the right frames and pulling the stuttery 12 fps pattern 
like filmdint does. I need to run this with verbose turned on to see why 
it's not recovering.

ivtc=1 simply doesn't work. It picks the wrong frames from the very 
beginning. I guess it's not expecting to see multiple progressive frames.

Would another filter like decimate help these filters by removing the 
duplicate frames, giving the filters something closer to what they 
expect? It seems like this should be a very easy pattern to pull from 
since all the frames are progressive and clean (just that some of them 
are missing sometimes).

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