Exported mixes from STP drift out of sync

STP seems to have a mind of it's own. Mixes that use to export fine are now drifting out of sync over time, about 2 seconds over fifteen minutes. If I export the mix either directly from STP or through Compressor, it drifts.
However if I export with video (through Compressor), the audio is in sync properly.
Does anyone on the STP team have a clue as to what this might be? It's driving us nuts!
Michael Buday

Thanks Gavin. I often do the same thing, export projects with a large number of tracks through Compressor because exporting directly from STP is just too unreliable (missing EFX, keyframe levels/pans missed entirely, etc.)
I tried exporting as usual through Compressor using the standard 48:16 preset, but again - drift. When I then switched to PRESERVE VIDEO with the same audio settings, the sync was fine. This is a workaround, but a real pain in the butt because I then have to extract the audio out of the .mov file. Not rocket science, but just too many steps to do all the time.
The weird thing is, this has happened only three times out of about 50 projects, but once it occurs, it's as if the project is corrupted in some way and it never exports properly again.
Michael Buday
G5 Dual 1.8 GHZ Mac OS X (10.4.3) FCP 5.03, STO 1.01

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When exporting separate audio and video streams, the audio drifts out of sync

So this is my first slightly larger project in Final Cut Pro X.
When I export my finished project (around 12 minutes long) straight to quicktime, it plays back perfectly.
When I export using compressor, the resulting audio and video streams are two different lengths. The audio comes out a full second longer. If you try to lay them down in a program like Adobe Encore, the audio starts out perfectly in sync. Two minutes in you notice the video is slightly out of sync with the audio. By the end of the video it's comically bad, over a second out of sync.
What's even more vexing is if I try to take the quicktime file that IS in sync upon playback, and try to convert it burn that to a dvd or blu-ray using toast, the problem re-emerges.
I triec searching around, but most of the suggestions that came up were vauge, like, "Upgrade to a real program like Final Cut." (This was in reply to people who were using free software programs.)
I did see one idea surface where 44 and 48 kHz sampling rates don't play well together. So I combed through my project and found all the 44.1 songs that were used, and swapped them out with upsampled versions. Nothing changed. It didn't sound like it would fix it, as people usually said it was a specific amount of frames off, not something drifting out of sync.
So the question is, does anyone have any suggestions on what could be causing this? Thanks! :-)

Project settings can be accessed and changed by selecting the project and pressing command-J. Then, in the inspector, click on the little gear in the lower-right hand corner to access the settings.
Why are you trying to output video/audio separately? If the content plays in-sync when exporting a quicktime movie (using current project settings), you could try separating the video/audio using MPEG Streamclip as a second step instead of using compressor. For audio, don't change the sample rate from the project settings, and use uncompressed audio (AIFF) as the output format.

Audio drifts out of sync since Quicktime 7.6 update!

Help!
Seems like ever since i updated the Quicktime to 7.6 my uncompressed 8 or 10 bit sequences for playout to digital betacam drifts out of sync over time!
But when i just go to the end of the sequence and hit play, everything seems fine.
I just restarted to my old Tiger system and there the problem doesn't seem to be there.
Any ideas??
I use the blackmagic Multibridge Extreme.
Another strange thing is that when i playout to HD, there is also no problem!
Thank you for your time,
Steve Pittoors

I have had my audio drift out of sync also, not with Betacam, but DV. I basically send the audio from FCP to STP and tweek the audio, and then on export back to FCP it adds about 10 frames worth of audio. It starts in sync and then drifts by the end of the sequence. I have had no problems with shorter sequences - ie. 30 sec. The one I am working on now is just over 6 minutes. What is weird is that the sequence length in both FCP and STP are the exact same, but when I export back it drifts and adds in the extra frames.
I tried fiddling with all the framerate settings in STP and it still does it.
I posted last night in FCP and STP forums and haven't had any luck.

Audio drifts out of sync.

Help!
Seems like ever since i updated the Quicktime to 7.6 my uncompressed 8 or 10 bit sequences for playout to digital betacam drifts out of sync over time!
But when in FCP i just go to the end of the sequence and hit play, everything seems fine.
I just restarted to my old Tiger system and there the problem doesn't seem to be there.
Any ideas?
I use the blackmagic Multibridge Extreme.
Another strange thing is that when i playout to HD, there is also no problem!
Thank you for your time,
Steve Pittoors

Might try reloading drivers for the capture card... sure sounds like it may well be the problem if non converted footage is in sync...
If this fails, try exporting the HD sequence to compressor and compress it to SD there, then lay out the resulting file from FCP not having the capture card do any conversion.
Jerry

Audio Drifts Out of Sync After Demux

Hi,
I demuxed an hour-long program from DVD to .m2v and .ac3 using MPEG Streamclip. The audio drifts out of sync very gradually, and by the end is way off.
I don't want to re-compress the audio, as it is already AC3. According to Quicktime, the video is 29.97 fps, and the audio is 16-bit 48 khz.
When I used to Export to DV option, everything stayed in sync. I can't go this route, however, since I can't afford to re-compress anything (I'm making a new DVD from this old one). Just an FYI that this worked.
Ever run into this problem before?

I am using version 1.9. In the preferences pane, I don't have anything checked.
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Why is my dialogue track drifting out of sync?

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Audio drifts out of sync in QT

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Thanks for taking an interest, Studio X.
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Sorry, I accidentally submitted the question before I had finished entering it ... here is more info ...
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"You say that there is a fix for the division problem. If you don't mind, could you tell me what that might be? "
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Word clock
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http://www.youtube.com/watch?v=GPCXPxTyZbM
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https://discussions.apple.com/docs/DOC-1726

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Audio slowly drifts out of sync with video

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MtD

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Hi there,
I'm trying to find an answer to what seems to be a common issue when exporting projects out of Final Cut Pro X, however I haven't yet found any answers that work or that tell me things I don't already know (don't mean to sound know-it-all though).
The issue is that after I have exported my project, the audio and video are out of sync. It doesn't drift as the video goes on; it's out of sync by the same amount from start to end. Of course, when editing and viewing the project in Final Cut, the sync is fine.
The project was created from scratch with the Apple ProRes 422 setting, the two original camera angles were both 25p, the audio I'm using is 48K/24bit which the project is setup as also. The audio was originally recorded at 48k/24bit and mixed seperately in Pro Tools and was exported as a wave file (48K/24bit) and brought back into Final Cut.
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Hey Russ,
Thanks for your time. When I say a 'common issue' I found that when I searched it both on Google as well as this support forum I found multiple threads and questions pertaining to this issue of sync and/or drift.
I tested this single angle idea by using the footage in a nother project and exporting part of that (without changing angles) and it seemed to be OK. However I have other projects which are only single angle but they export slightly out of sync as well. I haven't found a common denominator yet.
When I say out of sync, it's not dramatic, however it's always the same - the audio is just a few frames behind the video. This has happened with most of my projects using different footage and different audio, etc. No matter what setting audio and video are recorded at, and regardless of whether I dramaticallty colourise or add effects to the video or not, it's always the same result; slightly behind audio when exported.
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If you're referring to project setup presets, I can't really change too many things because obviously the audio resolution and video frame rates are predetermined so I can't try 25p footage in a 30p project, etc.
Thanks again,
Chris

Exported mixes from STP drift out of sync

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