RC <rcooley <at> spamcop.net> writes:
Not much to describe. All the ivtc filters work on fields, not frames, so you put tinterlace before pullup/filmdint/ivtc/detc to give it fields to work with.
It only took a minute to find the original thread: http://thread.gmane.org/gmane.comp.video.mencoder.user/536
ah! geez. clearly i am an idiot. i didnt realize there was an mencoder-users list; my google-fu was failing completely because i kept searching for mplayer-users plus other stuff. the OP in that thread seems to think this technique does not work, but it seems to me that it should. i'm trying it out right now. i'm occasionally seeing skipped frames and duplicated frames, but this may be during commercials. i'll have to try and correlate the bursts of problem areas with the comms. Steven Adeff <adeffs.mythtv <at> gmail.com> writes:
-vf decimate=2:1000:1600:.001, has worked great for me on all my 60p HDTV content to bring it back down to 24p. I've never found an instance where "those windows programs" get it right where this doesn't, and I've encoded a lot of 60p content.
in fact this is what i had been doing, but i hadnt yet found the magic min/max/frac values yet, and as i mentioned in my original post, i was dropping too many frames in low-motion scenes... i guess i'll also try these arguments and see how it works out. Rich Felker <dalias <at> aerifal.cx> writes:
The basic idea is: -vf tinterlace,pullup
The above filter chain will leave you with incorrectly double-height video. You can scale back down afterwards. There are tricks using nearest-neighbor resampling with the scale filter to get the exact right behavior and compensate for the incorrect fake interlacing that tinterlace makes, but I wouldn't suggest trying such things unless you have a problem with the output, since you're likely to make it worse if you don't understand the repercussions.
yeah, i modified my script to add tinterlace and scale back down and made some test clips, and they all looked okay. so i've launched a full 2-pass transcode of an entire show. i'll burn the scaling bridge if/when i come to it :) thanks everyone for your help. rob