HDV audio issue at DVinfo.net

Gerald Webb · April 23rd, 2013, 07:36 PM

Can someone help with this.
M2T files from Z5, rewrapped with Clipwrap (audio left as is, not changed to LPCM.)
The re wrapped .mov dropped in FCX in a 1440x1080 25P, 48kHz project.
Im getting this, (see pic)
The gaps in the audio are mostly about 20 frames apart, but not always. They roll off rather than being straight cuts. It is sometimes unnoticeable when listening, but once you know its there......
Original cam files dont have the issue in other NLEs
The re wrapped files dont have the issue in other NLEs.
Media info for both the m2t and the rewrap (see pics)

William Hohauser · April 23rd, 2013, 07:48 PM

Have you tried transcoding a file to ProRes?

Gerald Webb · April 23rd, 2013, 08:02 PM

Thanks William,
Do you mean from within Final Cut (optimise media, Ive done that, no change)
or before import?

William Hohauser · April 24th, 2013, 03:34 PM

Change the audio to LCPM as I remember FCP7 had problems with AC3 audio that HDV cameras record.

Gerald Webb · April 25th, 2013, 04:04 AM

OK, sorted.
It happens with Clipwrap. I was leaving the audio as a pass thru, stream copy.
In Clipwrap preferences you can select Convert to LPCM as an option.
When doing this, all is ok with the audio, (weird though, it actually changes the duration of the clip, might be an issue if multi cam. See pic, same clip in same place on timeline with the 2 different audio options. Thats a problem for another day.....)
You called it William. Thanks.

April 23rd, 2013, 07:36 PM	#1
Gerald Webb Trustee Join Date: Oct 2009 Location: Central Coast Australia Posts: 1,046	HDV audio issue Can someone help with this. M2T files from Z5, rewrapped with Clipwrap (audio left as is, not changed to LPCM.) The re wrapped .mov dropped in FCX in a 1440x1080 25P, 48kHz project. Im getting this, (see pic) The gaps in the audio are mostly about 20 frames apart, but not always. They roll off rather than being straight cuts. It is sometimes unnoticeable when listening, but once you know its there...... Original cam files dont have the issue in other NLEs The re wrapped files dont have the issue in other NLEs. Media info for both the m2t and the rewrap (see pics) Attached Thumbnails __________________ http://vimeo.com/livewebvideo

April 23rd, 2013, 07:48 PM	#2
William Hohauser Inner Circle Join Date: Dec 2005 Location: New York City Posts: 2,650	Re: HDV audio issue Have you tried transcoding a file to ProRes? __________________ William Hohauser - New York City Producer/Edit/Camera/Animation

April 23rd, 2013, 08:02 PM	#3
Gerald Webb Trustee Join Date: Oct 2009 Location: Central Coast Australia Posts: 1,046	Re: HDV audio issue Thanks William, Do you mean from within Final Cut (optimise media, Ive done that, no change) or before import? __________________ http://vimeo.com/livewebvideo

April 24th, 2013, 03:34 PM	#4
William Hohauser Inner Circle Join Date: Dec 2005 Location: New York City Posts: 2,650	Re: HDV audio issue Change the audio to LCPM as I remember FCP7 had problems with AC3 audio that HDV cameras record. __________________ William Hohauser - New York City Producer/Edit/Camera/Animation

April 25th, 2013, 04:04 AM	#5
Gerald Webb Trustee Join Date: Oct 2009 Location: Central Coast Australia Posts: 1,046	Re: HDV audio issue OK, sorted. It happens with Clipwrap. I was leaving the audio as a pass thru, stream copy. In Clipwrap preferences you can select Convert to LPCM as an option. When doing this, all is ok with the audio, (weird though, it actually changes the duration of the clip, might be an issue if multi cam. See pic, same clip in same place on timeline with the 2 different audio options. Thats a problem for another day.....) You called it William. Thanks. Attached Thumbnails __________________ http://vimeo.com/livewebvideo