Dropping one single frame in a two hour capture?

[justin81]

Does this matter? Will the video look jerky or lose audio synch if a single frame is lost?

[filmboss80]

Depends on the frame, doesn't it? Like, if it's the final frame of black at the end of the movie -- who cares? Watch the video. If there's a problem, capture again.

[manono]

At 29.97fps, the loss of one frame (if not accompanied also by the loss of the audio for that frame) will mean an audio desynch of 33ms, not enough to tell. There may or may not be a noticeable but very slight jerk or stutter at that place. If you're reencoding it for something, you can restore the audio synch by adding in a frame (duplicating an adjoining frame) using the Loop command of AviSynth followed by using the BadFrames filter on that frame to blend together the 2 adjoining frames. That'll effectively remove the stutter pretty much.

And if not reencoding, and even if reencoding and not frameserving using an AviSynth script, I don't think the problem is serious enough to worry about.

[Gavino]

If you're reencoding it for something, you can restore the audio synch by adding in a frame (duplicating an adjoining frame) using the Loop command of AviSynth ...

Loop will also duplicate the audio for the frame, so will maintain any desync.
Better to use DuplicateFrame which doesn't touch the audio.

[manono]

I don't include the audio in my scripts, so it wouldn't be a problem for me. Good to know, though.

[justin81]

Thanks for the advice!