IVTC NTSC source with dropped frames

[styx66]

OK so i'm capturing video from my Tivo. Its a certain television show filmed at 23.976 and of course bastardly telecined to 29.976 fps over the airwaves. I can use the inverse telecine methods to fix this, but I've been running into the problem that for some reason, Vdub capturing to Huffyuv 720x480 w/ PCM Sound, using only 50-60% of my cpu, i can rarely ever get over more than 3 or 4 minutes without dropping 1 silly frame somewhere. I captured 15 minutes straight and lost 4 over that period of time. I've tried all sorts of things to get it to stop but I cant figure it out right now so I'm looking for a way around the fact that the IVTC gets out of synch after that frame is dropped. Is my only option chopping the video up and IVTC'ing each part? Is there a better IVTC filter out there that can handle that on an 'adaptive' basis? I tried Virtualdub's adaptive IVTC but it doesnt account for the dropped frame(s). Help before my Tivo deletes this thing! :p

-styx66

[Cart]

VirtualDub is probably dropping frames to maintain audio synchronization. This occurs as a result of slight inaccuracies in sound cards, and it's normal.

TMPGEnc's inverse telecine filter might do a better job than VirtualDub's. I like using the Telecide/Decimate filters for VirtualDub best of all, but they require multiple passes/files. Perhaps the new Avisynth versions will simplify the process.
http://sauron.mordor.net/dgraft/

-Cart
http://www.geocities.com/lukesvideo/index.html

[styx66]

I did read a comment about the frame drops due to audio synch before, so on a whim just now i tried capturing without audio, and still I get that one dropped frame around 3:30 into the capture. I also disabled the lock audio/video stream and disabled adjust video clock to match audio clock, with the same results. Something else must be causing it, and i guess i'll have to live with it. I guess i could go back to my ATI MMC capture program and capture mpeg2, but it doesn't do that great a job compared to huffy/virtualdub. And I've tried capturing to huffy through MMC and its a disaster. Maybe its my hardware or even my hard drive just getting pooped.

I'll try the latest avisynth and tmpegenc, tho i think i'm still bothered by those little frames i know are gone :)

Thanks for your reply...

-styx66

[Cart]

The dropped frame could also be caused by something as small as capturing 29.976 fps instead of 29.97 fps (the standard). You could try using AVI_IO for capture to see if it fares any better.

Good luck,
Cart
http://www.geocities.com/lukesvideo/index.html