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Audio distortion
I recently shot using the HVX 720P @23.98 onto P2 cards. About a week later I went to edit the show and found out that the audio is all distorted and out of synch.
The audio is about 30 seconds late on the clips. Normally I could fix that but it is distorted as well. I sounds like it has an echo in the sound and it is going in and out of phase. Also, there is a constant ticking in the audio and it is extremely hot, high levels. The picture seems fine.
The sound comes from two sources. Channel 1 was from a wireless mic and channel 2 was an on camera boom (Sennheiser). Both channels have the distortion and are both out of synch. The files were copied from the P2 cards into FCP v6.0.1 using the “log and transfer” feature to a LaCie 500GB external FW800 drive.
We monitored the audio on the shoot, the levels were fine and I could hear both mics in the headphones free of distortion from each ear respectively.
I know there is no way to save the shoot but I would like to know if anyone has experienced this, what was the cause and of course if it can be averted the next time.
Thanks
David
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7 Replies
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Have you tried looking at the clips in Raylight or P2 CMS? Perhaps there’s an issue with your setup.
Noah
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Noah,
Thanks – The clips are already ingested into FCP and are therefore Quicktime videos. I tried many different ways to view them in QT, FCP and After Effects. I also extracted the audio and listened to that in ProTools and Sound Edit Pro all with the same result. I have not tried Raylight (no PC) however the media is no longer on the cards, they came from a rental house.
David
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Did you make backups of the P2 card images onto a hard drive? This is the workflow we always always recommend. Once you go to QuickTime you’re kinda done…
Noah
Unlock the secrets of the DVX100, Apple Color and now the HVX200!
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I’ll practically guarantee you that your footage was fine on the cards, and something went haywire when FCP imported/converted it.
I tell everyone with FCP: Use Raylight. It avoids any and all hassles. Raylight isn’t just for PC, Raylight for the Mac lets you directly edit your footage without using any sort of conversion to Quicktime. You edit off the camera-original MXF files, so you won’t have any issues at all with clips failing to import, or frame rates changing on you, or audio distorting, etc.
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I suggest you always playback the first few clips you shoot (in camera) and continue to do so periodically during your shoot. Even in the “old days” of Beta this was a safe procedure. That way you know that your original recording is OK. We transfer all our P2 cards in the field and use Raylight or HD Log to play parts of each clip to confirm. This is probably also a good way to go as you capture clips to QT from P2.
John
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I have a very similar problem to what you described. I don’t guess you ever found a solution?
I shot and transfer 720 24p footage. A couple weeks later (p2 cards cleaned off), I have a bunch of .mov files that the audio is roughly 20% shorter than the video tracks and have popping noise.
Is it a problem with the audio or that the video still contains the extra frames? If so, how can I remove them?
Greatly appreciate any feedback or help of any kind.
Thanks in advance!
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I discovered that there was no solution to what I went through with the audio. It was a fluke as I could not repeat the issue. It seems the hard drive I had was not writing fast enough – not sure why.
D-
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