I assume the video doesn't do this is you play it in vlc or some such player.
Have you tried deleting the index and audio conform files and have PPro re-index and conform again? Keeping in mind not to touch the machine at all when its doing this, as i've found that can cause issues.
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I work only with 1080p 50fps PAL files from my panasonic SD-700.
As a non-standard format, I suppose that might possibly be an issue. Try recording some normal 1080i/25 and see if you get the same behavior.
@firetrak: Yes, I have tried that. I deleted the entire media cache, re-opened the project and left the computer alone to do the conforming and whatever else it needs to do. When I came back from preparing and eating diner, it was all done, but the problem was still there.
@Jim: Haven't tried that yet. Will do that and report back. I'm not sure if the cam will record 25fps though. But 1080i 50 is also a more conventional format I guess. So I will try that to figure out if this issue has something to do with the 1080p 50 format.
1080i/25 is the normal video format, 1080i/50 is an incorrect way of saying the same thing (25 interlaced frames per second). 1080p/50 (50 progressive frames per second) is the oddball format that neither HDTV nor Blu-ray support, but only a very few consumer level cameras.
I just recorded some footage of myself talking to the camera with the 1080p50 swiched off, imported it and played it back. No problems with the audio sync! I almost drew the conclusion that the odd format of 1080p50 is in fact the issue. However, just to double check, I ran some of the 50p footage again and found out that this time it synced spot on....
For me it's too soon to say the problem is solved, as I didn't do anything to fix it. At the same time, as long as it's not there anymore I'm happy. I expect it to resurface at some point, though. It has been there for a few weeks now, I can't imagine it disappearing overnight because of nothing.
Anyway, thanks so far for your suggestions and for clarifying the issue of 50p/50i/25i. I appreciate it.