I have about a 1/2 GB file of a 90 minute presentation on the timeline and when I play back the first minute or so, the audio is synced up fine with the speaker's lips. I jump halfway through, it's off a little bit. I jumo to the end, it's off by about a full second.
To be clear: The audio sync is COMPLETELY FINE throughout the video when opened in Quicktime. I simply need to add an opening animation and some titles to it; I've also tried to edit in Premier with exactly the same problem arising. The file is on the actual HD of a 2012 MacBook pro (not playing off an external HD), 8GB RAM, quadcore processor so I don't see how it could be playback lag thing. I have also restarted the computer.
Any help would be OUTSTANDING. I'm seriously all out of ideas.
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Well, this was ripped from a DVD using Handbrake and transcoded to .mp4 and H.264 codec so I wasn't anticipating this sort of problem. There were 4 DVDs - two about an hour long and two about 90 minutes. It could be coincidence but, the hour long presentations are synced just fine. All the files aren't particularly big in any case.
I do have MPEG Streamclip so, I may just try that for the hell of it. Thanks for the suggestions!