Audio Clipping only after capture at DVinfo.net

Brandon Carter · August 23rd, 2009, 05:36 PM

I did a shoot today. I check all my audio levels....everything looked fine. I listened through earphones the entire shoot.....never heard anything but crisp audio. I'm using a Cannon HV20 as my deck. When it plays, the audio sounds fine. I am capturing via HDMI through my blackmagic card, converting from HD to Pro Res. Once it plays through into FCPS2 one channel is clipping pretty bad. I recorded using two wireless lavs. In scenes with two talent I can cut the clipped section down and the other mic picks up just fine. However I have some clips with the clipping channel only that I really need. What can I do?

Glenn Fisher · August 23rd, 2009, 06:52 PM

This isn't meant to be an answer to your problem (although there's a small chance that it might be), but rather a comment on your workflow.

I don't know if there's an advantage to capturing over HDMI instead of Firewire. The HDMI output of the HV20 is great for getting an uncompressed signal while the camera is recording, but once an image is saved to tape, it's already been compressed so the HDMI output of the compressed image is no different than the Firewire output. That's been my understanding, anyway.

So on that note, have you tried capturing portions of your video where the audio is clipping through Firewire instead of HDMI?

Rick Reineke · August 24th, 2009, 08:53 AM

I concur with what Glen posted, Try a Firewire transfer.
It also may be a result of the conversion from HD.
If that fails, the audio "may" be salvageable using an audio Clip Restoration plug-in.

Marcus Martell · August 24th, 2009, 09:54 AM

Hola, seems somebody having my same issue right here...
Where can i find this plug in?

thanks a lot my friends

August 23rd, 2009, 05:36 PM	#1
Brandon Carter Regular Crew Join Date: Feb 2009 Location: Baton Rouge, Louisiana Posts: 76	Audio Clipping only after capture I did a shoot today. I check all my audio levels....everything looked fine. I listened through earphones the entire shoot.....never heard anything but crisp audio. I'm using a Cannon HV20 as my deck. When it plays, the audio sounds fine. I am capturing via HDMI through my blackmagic card, converting from HD to Pro Res. Once it plays through into FCPS2 one channel is clipping pretty bad. I recorded using two wireless lavs. In scenes with two talent I can cut the clipped section down and the other mic picks up just fine. However I have some clips with the clipping channel only that I really need. What can I do?

August 23rd, 2009, 06:52 PM	#2
Glenn Fisher Regular Crew Join Date: Dec 2007 Location: Bridgewater, NJ Posts: 65	This isn't meant to be an answer to your problem (although there's a small chance that it might be), but rather a comment on your workflow. I don't know if there's an advantage to capturing over HDMI instead of Firewire. The HDMI output of the HV20 is great for getting an uncompressed signal while the camera is recording, but once an image is saved to tape, it's already been compressed so the HDMI output of the compressed image is no different than the Firewire output. That's been my understanding, anyway. So on that note, have you tried capturing portions of your video where the audio is clipping through Firewire instead of HDMI?

August 24th, 2009, 08:53 AM	#3
Rick Reineke Inner Circle Join Date: Aug 2008 Location: New York Posts: 2,039	I concur with what Glen posted, Try a Firewire transfer. It also may be a result of the conversion from HD. If that fails, the audio "may" be salvageable using an audio Clip Restoration plug-in.

August 24th, 2009, 09:54 AM	#4
Marcus Martell Trustee Join Date: Nov 2008 Location: spain Posts: 1,202	Hola, seems somebody having my same issue right here... Where can i find this plug in? thanks a lot my friends