I've been doing a little experimenting with inverse telecining ever since I read about some of its advantages (ie freeing up a fair amount of bit rate) on the forum. I haven't been having much luck with it, though. The playback always seems to turn out somewhat jerky and, over extended clips, I get major sound problems (things started out alright but then the sound dropped out for 2/3's of the video; when it started back up, it started from the point where it, the audio, had previously stopped - obviously a large sync problem).
I've been using the I.T. filter in TMPGenc on captured analog video (captured from TV). I've been capturing through VideoDub using the Huffyuv v2.1.1 codec, which I've then clipped, joined, and recompressed using Indeo 5.11.
Does I.T. not work well with TV captures? Most of the comments I read before were in reference to captures of movies.
Is there another program that performs I.T. better than TMPGenc?
Am I just fighting for a lost cause?
Any tips would be helpful and greatly appreciated.
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First off, TMPGEnc is probably the BEST program I have ever used for Inverse Telecining, so you're not going to find another program that can do it as well as it can. Don't bother looking
As for your I.T. problems, it might be with your captures. In order for I.T. to work you must capture at 640x480. This is because the Telecining process has been placed in the 480 horizontal resolution and if you capture any lower you blend the fields, or even skip fields (as in 320x240 captures). You can never truely get the original 24fps back in lower captures.
If your captures are fine then it could be that your source material was never 24fps to begin with. Inverse Telecining 29.97fps will definitely cause jerky playback.
If your captures are fine, and your source is 24fps then it could be that the source doesn't follow the 3:2 pulldown process the way it should. Music Videos, Movie Trailers, and sometimes even movies themselves reset the 3:2 pulldown process whenever there is a cut to another scene. This is a nightmare, because you have to manually reset the Inverse Telecine process at every single scene cut in TMPGEnc.
If all else fails, try to manually apply the Inverse Telecine process. Double click on "Inverse Telecine" in TMPGEnc. When the dialog box opens, right mouse click on the very first image and choose "Deal After This Frame According To Seleted Patern." Enter: 10010. If that doesn't work try 00101, or 01010, or 10100, or 01001. One of those is bound to work
Hope this helps.
Guiboche -
Virtual Dub has a great one called Telecide, but my favorite is the new Decomb filter for AVIsynth. It is simply amazing. Also, it attempts to adjust for changed patterens (and even hybrid frames), quite sucessfully too. Furthmore, using it outside of TMPGenc allows for use of other filters as well, such as a temporal cleaner.
Look for Decomb on doom9 or Donald Gaft's website.
Darryl
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