Quote:
Originally Posted by Emulgator
Hi Zenitram !
Many thanks for your continued work !
While going through my testfiles I found mediainfo recognising multichannel MPEG Audio Layer 2 streams
(I got 4-CH, 5-CH, 6-CH as 5.1, up to 8 shall be possible) as 2 channel streams.
I can supply some testfiles, if needed.
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AFAIK, MPEG Audio Layer II only supports channel modes "Stereo" (00), "Joint Stereo" (01), "Dual Channel" (10) and "Single Channel" (11). Same for Layer III, by the way.
https://web.archive.org/web/20150208...at/mpeghdr.htm
The so-called "MPEG Multichannel" extension uses a
“channel matrixing scheme, where the additional channels are mixed into the two backwards compatible channels”, similar (but apparently
not compatible to) Dolby Pro Logic.
So, technically, this would still be a Stereo file, just with the signals for the additional "sourround" channels mixed into the actual two (Stereo) channels...