SYNCING 24FPS VIDEO WITH .WAV FILES
Posted 07 September 2009 - 05:57 AM
I have timed the spike on the wave form from the WAV file in FCP 6 so that it matches the clapboard closing on the video file.
But 5 minutes into the clip (which is seamless - no edits), the sound and video are out of sync (the video is lagging).
Posted 07 September 2009 - 10:34 AM
Posted 08 September 2009 - 01:27 AM
Thanks for the suggestion, but I'd prefer not to fiddle with the sound, as it is fine as it is.
I am guessing that what is happening is that FCP is doing something to the video (such as adding an extra frame every certain interval), which is causing the sound and video to go out of step.
Anyone have any other suggestions ?
Posted 08 September 2009 - 01:30 AM
Posted 08 September 2009 - 07:49 AM
Good luck. I'll bet you are frustrated!
Posted 08 September 2009 - 07:50 AM
You are loosing sync, I think, because the sound was recorded differently than it should be. For examply your audio recorder was set at 30fps as opposed to 24 or 23.978. You're either gonna have to find where you start loosing sync and resync it and/or change the audio rate as mentioned.
Posted 08 September 2009 - 07:55 AM
Posted 08 September 2009 - 09:17 AM
I've had this exact same problem on a 10 minute clip. This is what worked for me, but keep in mind my Quicktime movie (pro res as well) was transferred at 23.98 fps. You may want to check that info in FCP or QT player. If your your quicktime movie was transferred at exactly 24 fps, then this solution won't work.
Obviously, you'll want to have a backup of your audio file first. If you go into an audio editing program and change the speed or pitch to 99.9% and then re-import to your timeline and all will be fine. You may also be able to do it from within in FCP, but I've never done it that way.
Posted 08 September 2009 - 04:06 PM
Posted 08 September 2009 - 05:12 PM
Posted 09 September 2009 - 05:57 AM
I tried the 99.9% fix and it worked perfectly.
As the sound was recorded on a Sound Devices 702 (D. Goulder must be clairvoyant !!), which lets me set a sample rate of 48.048k but which stamps the file as 48k, I will use this setting on my next recording and hopefully avoid having to fix the sound in post.
I will also drop a line to the folks at Sound Devices to suggest that they include a bit more detail about Sample Rates in their manual so that other neophytes don't experience the same problems.
Posted 09 September 2009 - 03:21 PM
While it may be pretty basic stuff for you much more experienced types, if anyone less experienced is reading this post, the article may be helpful.
One can find it at: http://www.sounddevi...ormat-overview/
Posted 09 September 2009 - 05:31 PM
I knew you were going to post this.
(D. Goulder must be clairvoyant !!)