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Audio slipping
I read a bunch of thread postings about random FCP audio drifting. I’m having a similar problem but nobody seemed to really answer it on the threads so far so here it is- any help would be greatly appreciated!
I’ve been working with a FCP project for the last 8 months. Recently audio clips that I’ve been working with for months and some that are brand new somehow started to play incorrectly. If played alone they are perfect but if played as part of a sequence of audio clips sometimes they play perfectly, sometimes they cut off at the end. They always seem to start in the correct spot when played with other clips but, by the end of the sequence, a second or even more than a second will be cropped. The picture I’m seeing on the screen of my sequence will be exactly the same the whole time- just sometimes it plays straight through and sometimes it doesn’t.
This makes it hard to edit audio because I’m second guessing every single clip and cannot properly critique them as a whole (as part of a sequence). This happens with and without corresponding footage although the footage is NEVER cut short. With an image attached, the audio starts to slip and the image will end on time but with audio that is a little slow. The audio ends prematurely but the picture ends on time. Does this make any sense? It sure doesn’t to me.
I’ve re-started my computer and created new sequences but the same thing happens (on occasion). It is happening in old and new sequences. I am working in DVC PRO HD 720P 60 at 24fps. When I export the problematic sequence to QT the .mov file is perfect and does not reflect any of these problems. Any ideas? I don’t want to rebuild this whole project!
Chelsea
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3 Replies
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Your footage is at 24 fps, your audio is at either 29.97 or 30fps. professional post studios call it pull up or drop back. There is no good way to fix it. Pull up and Drop back only line up the audio so that it will finish when the footage finishes, but that means that more things will probably be even more out of sync than just going in and manually editing. If this is the case then your audio should get gradually more and more out of sync as the footage rolls on. If it doesn’t get increasingly out of sync as you watch it then it’s something else. good luck babb.
brt
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We solved the problem… by taking out the blackmagic card. It was an intensity pro card and we started having these problems as soon as we started using it. Now that we’ve taken it out all of our strange audio problems have melted away. None of these problems were because of incompatible 24fps to 30fps issues- they all seemed to be because of that card.
Chelsea
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I know you said you solved it by removing the black magic card but I thought I might have something useful to add on this.
I don’t deal with blackmagic but I know with kona capture cards if you check the expansion slot utility is giving enough lanes to the Kona (in your case blackmagic) card /System/Library/CoreServices
Cheers,
Si
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