I need to sync an audio track extracted from a 29.970 video (AUDIO 1), to a 23.976 video (AUDIO 2). They start in sync and progressively loose it throughout the movie.
I used a small test sample and an editor to shrink AUDIO 1 (5min:08s) to the same lenght of AUDIO 2 (5min:00s). Now they start and end in sync but desynchronize in the middle.
I want to adjust ony the audio, don't want to mess with the 23.976 video.
Any ideas will be welcome.
Thanks.
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There should be no difference in running time between a 23.976 fps and 29.97 fps version of a video. Something is wrong with one or both of your sources or how they were treated.
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I'd see if the sync loss is really progressive, or if it loses frames or frame groups in various locations int he clip.
Indeed, something went wrong somewhere, but such a realization may not be of any benefit. I deal with projects like this a lot, fixing people's mistakes.Want my help? Ask here! (not via PM!)
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This is just a wild guess:
Is it a 0.1% drift?
Something somewhere is ‘pulling down’ your audio sample rate from 48000Hz to 48048Hz.
Please don’t ask me to explain. I’m probably wrong anyhow.
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