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Audio sync problem
Hi, I am working on a DV PAL edit with 20 audio tracks in FCP 6.0.4. Sequence audio is set to 48 khz. Now I want to export all audio tracks as one aiff using the export to aiff function. I set the export settings also to 48 khz and start exporting. Now I take my exported audio back into my sequence and throw it on audio track 21 to check the sync. The freshly exported/reimported audio is about 36 frames shorter than the sequence which leads to a drift in sync. The same problem I have when I get audio back from my sound guy who is also working on a mac and in 48khz. It doesn’t make any sense to me. I must be missing out on something (I hope). Please advise! Thanks a lot.
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4 Replies
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36 frames out of sync out of a total of how many frames? Is the pitch different? If you cant’ tell, try retiming the audio track to match exactly the video track. We used to do that often with the older Canon DV codecs which FCP did not like at all.
Audio sync is rarely a problem of different sampling frequencies since the length of the clip should be absolute. It’s more likely to be a frame rate mismatch between your source and the export or your export and the timeline.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”
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The length of the whole edit is 28 minutes. The pitch of the audio didn’t change. A framerate mismatch is unlikely I would say, as I exported the audio as aiff directly from the edit. It is a direct export and reimport from and into the same sequence.
Alex
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[Alex Fahl] “A framerate mismatch is unlikely I would say,”
Then it cannot possibly be out of sync, yes? And yet it is. So you say.
When the likely explanations have all been eliminated, the only ones left, regardless of their unlikeliness, are all you have left.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”
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Just clutching at straws here, did you render an Audio Mixdown (Sequence>Render Only>Mixdown) before exporting?
John
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