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Massive Pain In The Butt Export Issue… Please help !!
Hi all,
I have a problem that I haven’t seen before, and I can’t seem to figure out the solution. Here’s the scenario:
I have a 1.5 hour speech that was shot on two HDV camera’s. For some reason (let’s call it stupidity) one of the camera operators decided to start and stop the recording a couple times during the speech, and of course I would like to do a multi-cam edit on this footage. So, for cam 1, I have two files (tape 1, and tape 2), then for cam 2 I have 9 files (tape 1 and tape 2, plus the start stop recording). In addition to the video footage, I also have a wav audio file that is the full speech start to finish.
What I’ve done is created two sequences; one for cam 1 and one for cam 2. I’ve taken the video from cam1 and lined it up with the audio from the wav file, then exported it to its own file so I have one video file that has all of the video and audio from cam1. Then I did the same thing for cam 2. Now, in theory I should be able to do an easy multi cam because I have two video files to work with (cam1 and cam2) that have the exact same in point / timecode.
Its cam 2 that is creating the problem…. for some reason, when I export the file for cam 2, the audio goes out of sync… the final export is actually 18 frames shorter than the sequence. These 18 frames are what is causing the audio to go out of sync….
It doesn’t make any sense to me, and I’ve tried all I can think of to try and fix the problem…. any suggestions on what would cause a sequence export to current setting quicktime file to do this (I’ve tried both self contained and regular).
Thank you so much for your help in advance!!!!!
Blue
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7 Replies
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Check the sample rates of the source footage, your exported footage and the .wav file. Are they all 48k?
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I’m sure I should know the answer to this, but where do I see that?
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Ok… found the “aud rate” in the browser of FCP.
For the wave file, it’s 44.1 KHz. The HDV files are 48 KHZ.
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Minor Update…
Exported the wav to an aif @ 48k….
Now the sequence that I’m trying to export (video from cam 2, aif file as wave) is a little better, but there are still 8 frames missing.
Original sequence is 1:40:12:00
Exported MOV is: 1:40:11:22The thing I don’t get is that this doesn’t happen all the time… its enough to drive a sane person crazy… like seriously over the edge!!
Everything is perfect in the fcp sequence… exported mov file is not the same as the sequence.
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The sample rate difference will definitely cause problems. Good that you corrected that.
What codec did you export in, HDV? HDV’s long GOP structure might be causing this type of oddity (not really sure, just guessing). Can you export and edit using ProRes? -
I can… the odd thing is that I’ve done the exact same process with other speeches recorded the same day with all the same equipment without any problems.
For some reason, this one sequence is causing these royal pain the butt problems..
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You might want to check out PluralEyes, a piece of software that was introduced at NAB this year which automatically syncs clips by comparing their audio waveforms:
https://www.singularsoftware.com/autosync/index.html
Mike Raff
Richmond, VA
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