Cineform Digital Audio Distortion (formerly Embarassing Audio Question) at DVinfo.net

Daniel Rudd · January 7th, 2006, 12:24 PM

My Cineform seems to be adding some slight digital distortion to my audio clips.

Here are two identical clips of room ambience.

One is captured using the regular Cineform Codec
The other is captured using Adobe's HDV capture

Strangely enough, When I capture in Adobe's HDV setting, it still says it's converting to the Cineform Intermediary at the end of the clip.

I normalized to 50%, so you could easily hear the difference.

hdv captured: www.stock20.com/media/ambience-hdv.wav
Cineform: www.stock20.com/media/ambience-cineform.wav

David Newman · January 7th, 2006, 12:35 PM

Hmm.. As CineForm or Adobe HDV (also CineForm capture) does NOT compress the audio, I don't see how this can be. Audio is decompressed from the MPEG source and stored as uncompressed 16-bit 48kHz PCM.

Daniel Rudd · January 7th, 2006, 12:40 PM

I don't understand either.
But could you hear it in the clips?

Consistent results on different footage with a different mic and setting.

Daniel

David Newman · January 7th, 2006, 12:49 PM

Maybe it is question for support as I have not heard of this before. The audio difference could be small implementation between the MPEG audio decoders uses to convert to uncompressed. That maybe worthlooking at.

Daniel Rudd · January 7th, 2006, 03:25 PM

I sent a ticket, but I thought I'd see if anyone here had run into it.

Peter Rixner · January 8th, 2006, 03:06 PM

Hi :)

I had exactly the same thing with the cineform demo version.

Most of the time I record audio more safe on the second channel and it was absolutely useless because of that compression artifacts. Gladly, its not on the tape, what I first expected.

One of some reasons why the demo didn't convince me over the free adobe HDV (which I know is from cineform).

Peter

David Newman · January 8th, 2006, 05:49 PM

If there is an issue we will fix it. Make sure you report the camera and mode used in your trouble ticket, as it may be isolated.

January 7th, 2006, 12:24 PM	#1
Daniel Rudd Major Player Join Date: Aug 2005 Location: North Muskegon, MI Posts: 213	Cineform Digital Audio Distortion (formerly Embarassing Audio Question) My Cineform seems to be adding some slight digital distortion to my audio clips. Here are two identical clips of room ambience. One is captured using the regular Cineform Codec The other is captured using Adobe's HDV capture Strangely enough, When I capture in Adobe's HDV setting, it still says it's converting to the Cineform Intermediary at the end of the clip. I normalized to 50%, so you could easily hear the difference. hdv captured: www.stock20.com/media/ambience-hdv.wav Cineform: www.stock20.com/media/ambience-cineform.wav __________________ Daniel Rudd Digital Storyteller (Sony HDV, Aspect HD) Soundtrack Creation & Royalty Free Music Production www.stock20.com

January 7th, 2006, 12:35 PM	#2
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	Hmm.. As CineForm or Adobe HDV (also CineForm capture) does NOT compress the audio, I don't see how this can be. Audio is decompressed from the MPEG source and stored as uncompressed 16-bit 48kHz PCM. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

January 7th, 2006, 12:40 PM	#3
Daniel Rudd Major Player Join Date: Aug 2005 Location: North Muskegon, MI Posts: 213	I don't understand either. But could you hear it in the clips? Consistent results on different footage with a different mic and setting. Daniel __________________ Daniel Rudd Digital Storyteller (Sony HDV, Aspect HD) Soundtrack Creation & Royalty Free Music Production www.stock20.com

January 7th, 2006, 12:49 PM	#4
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	Maybe it is question for support as I have not heard of this before. The audio difference could be small implementation between the MPEG audio decoders uses to convert to uncompressed. That maybe worthlooking at. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

January 7th, 2006, 03:25 PM	#5
Daniel Rudd Major Player Join Date: Aug 2005 Location: North Muskegon, MI Posts: 213	I sent a ticket, but I thought I'd see if anyone here had run into it. __________________ Daniel Rudd Digital Storyteller (Sony HDV, Aspect HD) Soundtrack Creation & Royalty Free Music Production www.stock20.com

January 8th, 2006, 03:06 PM	#6
Peter Rixner Regular Crew Join Date: Mar 2005 Location: near Munich, Bavaria Posts: 139	The same was here Hi :) I had exactly the same thing with the cineform demo version. Most of the time I record audio more safe on the second channel and it was absolutely useless because of that compression artifacts. Gladly, its not on the tape, what I first expected. One of some reasons why the demo didn't convince me over the free adobe HDV (which I know is from cineform). Peter

January 8th, 2006, 05:49 PM	#7
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	If there is an issue we will fix it. Make sure you report the camera and mode used in your trouble ticket, as it may be isolated. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman