PCM is uncompressed. AAC and AC3 are lossy compression codecs. For maximum audio quality export the quicktime with uncompressed audio.
--- In Avid-L2@yahoogroups.com, John Moore <bigfish@...> wrote:
>
> Cross posting this because of the QT nature of the ?. I have to deliver a QT file for an hour long show. The video is ProRes 422HQ and the audio is codec PCM, Sample Rate: 48KHz, Bit Rates: 24 or 16, Channels: 2-Channel Stereo; 4-16 Master. I'm exporting from Avid and have set up the prores using 601/709 color space and everything for the audio makes sense but I have no choice of PCM. If I choose mpeg 4 audio the audio is aac stereeo in QT 7. I can't remember if that is the same as PCM, is it? I was worried that aac would be too compressed but I think I was thinking of ac3 which is more of a delivery format. Since it has to be a self contained movie I believe the only way to get the additional audio tracks will be to add them in QT pro. There is a way using reference movies but that would not allow me to create a ProRes 422HQ from avid media, right? Would it make sense to export a QT ref with all the necessary audio and then combine
> that with a prores export of the video in QT pro? I was pleasantly surprised to see the QT prores export from avid has sequence timecode according to QT 7 toggled to show time code. I forget when Avid started putting sequence time code on QT exports. TIA
>
> John Moore
>
> Barking Trout Productions
>
> Studio City, CA
>
> bigfish@...
>
> [Non-text portions of this message have been removed]
>
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