[MPlayer-DOCS] [matrix-encoded audio]

Corey Hickey bugfood-ml at fatooh.org
Mon Jul 7 22:57:33 CEST 2008

Jesper Furu wrote:
> Hi!
> I'm working as a cinema projectionist and I know people who got
> everything setup in the projection booth in order to record sound from
> the analog optical soundtrack of a 35mm print. Would such an audio
> sample do in order to test out the "matrix-encoded audio"
> filter/feature of MPlayer? The audio sample would go trough the noise
> reduction filter (Dolby A/Format 04) in the Dolby Cinema Processor
> unit, but recorded before the channel separation filter. The recording
> device is an old CD audio recorder unit and the result would be
> similar to an ordinary audio CD. This would probably brake some
> copyright laws, but I think I could get permission or find a way
> around it.
> I also know there exist some films shoot on video and mixed with
> stereo surround sound (low budget/ local film makers). If you choose
> to screen such a film from a computer instead of a video player this
> matrix decoding feature of MPlayer could turn out to be useful. On the
> other side, I'm not really sure there is a difference between the
> stereo sound from a VHS/DVD or a 35mm print of the same title (at
> least not all of them). It should be the same sound mixing, or why
> shouldn't it be? With different sound mixing the Dolby ProLogic
> technology wouldn't work. Or am I missing something?

Thank you for sending this; I will look at it, but I haven't yet had the
time to give it the attention it deserves, and I won't for another week
or so.


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