Dropped frames replacement?

[Maximus_G]

Hello,

I am capturing my home video at 768x576 with Mirovideo DC10+, using WDM drivers. It drops frames at the moments when there is some hard distortion on the screen (blank frames for example). And it drops frames even when the picture is OK, about 1 at a 1000-2000.

I'd say, it's OK... the problem comes when i try to sync audio and video. I use Vegas for that purpose, by previewing video and cutting/moving audio track.

Is there an automated way to insert blank frames at the places where something had been dropped, using Avisynth or smth.? Even if that wouldn't set the perfect sync, at least that would show me the places where i need to cut some audio.

[djidjo]

I can't answer your question about the automated way but I used to capture analog video also with a DC10+. Do you use VirtualDub ? I use it and when frames are dropped it inserts a duplicate frame (of the last captured frame)automatically, so sound and video are always in synch. Give it a try.
Hope it helps. This doesn't solve your problem but it might be a way to avoid it.
Djidjo

[mustardman]

I agree with djidjo, to a point. It is my understanding that when a capture card (analog or digital) drops a frame, a duplicate frame is inserted into the AVI stream, regardless of what the capture application is.

I have a DC30 & an ADVC100. When frames are dropped, a duplicate frame is inserted, but I can't be sure whether it is a duplicate of the last good frame, or the next good frame. Anyway, VDub has a search for dropped frame, which makes finding them really easy.