Audio Video sync problem

charlibob wrote on 3/2/2009, 10:56 AM
I recently had audio/video sync slippage on a rather long project I was editing. It started out ok, but somewhere along the line most of the audio slipped out of sync. It was a while before I realized it, because I was concentrating on cutting video segments. There was no pink warning color on the timeline, and because of that, it was not possible to activate "Synchronize" from the shortcut menu. I tried all the suggestions in the help file. I ended up having to slide over an hour of clips manually. It is difficult to be precise, but most of it turned out well enough. What a painful and time consuming experience.

What happens when the pink warning doesn't show when things get out of sync?

Comments

Ivan Lietaert wrote on 3/2/2009, 12:22 PM
This is a known bug for some mpeg2 containers. Sony doesn't seem in a hurry to do something about it...
richard-amirault wrote on 3/2/2009, 2:57 PM
but somewhere along the line most of the audio slipped out of sync.

" ... the audio slipped out of sync." There are two ways to look at that .. the other way is to say that the *video* slipped out of sync.

It can happen either way. Are you *sure* it was the audio?

There are a number of ways that audio and video can get out of sync and the "pink warning" does not show up on every case (as you've found out) I'm pretty sure that the "pink warning" only shows when the *entire* clip is out of sync .. as when you un-group the video and audio and slide one or the other.

I'll assume that your audio was from the camcorder and not an external audio recorder. That (dual system sound) is the most common case where the audio and video get out of sync over time. The control clock in both devices may not be running at the exact same time standard.

However I'm not sure why camcorder audio might get out of sync. Maybe skipping frames when you capture? I don't know.
charlibob wrote on 3/2/2009, 4:50 PM
Well, perhaps I will never know what happened in this case. Entire clips were out of sync, and they didn't show pink until I ungrouped them and started to slide. There were only a couple that were dead on, and dind't need adjustment.
I have found that in the case of dropped frames, the audio is missing at that point as well. The glitch in the audio is more annoying to me than the missing video.

Thanks to you both for your input.