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audio drift when re open project
settings: XDCAM HD422 1080p30, 30 fps, audio: 44.8 kHz, 16 bit
i’ve been having drifting problems which I thought i solved. (the XDCAM 1080p30 profile was still at 29.97 fps–I changed that to 30 fps and everything seemed okay). yesterday everything was fine, but today i opened my perfectly synced project and all the audio was drifting again. in sync at the beginning but off by about 17-20 frames by the end.
so how can closing the project and reopening cause this drifting?
I feel like the difference between 30 fps and 29.97 fps is the culprit, but what can be done to fix this?
i’ve read plenty of forums on drifting sound and tried everything I can think of. please help asap. thanks.
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4 Replies
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thanks for the response! i’m new to editing in other fps and in HD. i know “p” is progressive but the project was shot at 30 fps–so wouldn’t having it in 29.97 be problematic? i didn’t shoot the footage and it was H264 at 30 fps when I got it. what would be the best way to work with that? I encoded it to XDCAM at 30fps.
and thanks again for the help.
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AND how do I fix the problem? No matter what my settings are now (29.97 or 30) the audio drifts.
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my previous post didn’t go through i guess…
it was shot on a 5D. the footage when I got it was H264 at 30 fps. when i started cutting i used the XDCAM 1080p30 profile and DID NOT yet change it to 30fps–it was edited at 29.97. there were some minor audio mixing & effects done so i exported audio track to single aiff, re-imported it and that’s when the audio drifted and when I changed to 30 fps.
now the problem is i can’t get the drifting to stop. tried a new project at both 30 and 29.97, tried exporting and importing different ways–just trying to figure this out. thanks for any help. if i could send you a check i would!
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I think it was a combination of driver error and vehicle error… I’ve been looking into it and the footage shot on the 5D says it’s 30fps when it’s actually 29.97(?) So i might have been going off misinformation from the start, and from there it snowballed into relentless variants of frame rates and settings.
The audio was proceeding the video, so my short term solution was to export the final edit with no audio at 29.97 (through compressor) and import it to a new timeline with the old previously drifting audio. everything is fine.
my long term solution is to do some tests with this footage, run it through compressor first, and figure out a better work flow for the future.
Live and learn! Thanks for the help.
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