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32 bit audio

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Dave Hiebert32 bit audio
by on Apr 26, 2010 at 4:26:17 pm

Hi. I searched for this but couldn't find an answer for my problem. I just bought a Sony AX2000 HD video camera. It seems to record the audio as 48,000 Khz 32 bit )/Stereo. When I import this into AE CS4, I can see the audio waveform in the project thumbnail but when I drop it into a composition and try and render there is no audio on the clip. When I look on clips timeline under audio waveform there is nothing there. If I import the same clip into Premiere, the audio is there.

What am I doing wrong?


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Dave LaRondeRe: 32 bit audio
by on Apr 26, 2010 at 4:35:10 pm

It would appear that the audio from this camera is NOT recorded as separate audio tracks, but embedded in the video track: it's multiplexed, or muxed.

Are we talking about this footage being in some form of the mpeg codec? If yes, get yourself MPEG Streamclip (free, mac/win) and export video with separate audio tracks.

And If we ARE talkin' mpeg, consider this:

Dave's Stock Answer #1:

If the footage you imported into AE is any kind of the following -- footage in an HDV acquisition codec, MPEG1, MPEG2, AVCHD, mp4, mts, m2t, H.261 or H.264 -- you need to convert it to a different codec.

These kinds of footage use temporal, or interframe compression. They have keyframes at regular intervals, containing complete frame information. However, the frames in between do NOT have complete information. Interframe codecs toss out duplicated information.

In order to maintain peak rendering efficiency, AE needs complete information for each and every frame. But because these kinds of footage contain only partial information, AE freaks out, resulting in a wide variety of problems.


Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Dave HiebertRe: 32 bit audio
by on Apr 26, 2010 at 4:46:06 pm

Thanks for the quick reply. Yes, this is mpg file. I tried to install MPEG Streamclip and during install it said I had to uninstall all quicktime programs and install the quicktime alternative. Will this mess up premiere and AE Quicktime rendering capabilities?

Thanks again


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Dave LaRondeRe: 32 bit audio
by on Apr 26, 2010 at 6:38:22 pm

I don't know what they mean by the term, "quicktime alternative". Do they explain that?

Wait a minute... you don't happen to have QTX, do you? If so, uninstall and go for the latest version of QT7.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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