On Wed, 5 Nov 2014, blue...@caramail.com wrote:
"Moritz Barsnick" <barsn...@gmx.net> wrote:
This is the technicality which needs to be understood. If the source is
what Carl Eugen has identified, there is no digital indication that
this is "Dolby Surround". You will identify two channels which can be
played on stereo output, and will sound like a down-mix of surround
material on stereo. Yet in these two channels, there is a mixture of
four or six audio channels. If you know how to "decode" them, you can
separate them. Actually, you should be able to detect this surround
encoding if you analyze the audio waveforms, but this may mean actually
decoding them and checking whether the "extra" channels contain sound.
I might actually believe I was hearing pseudo-surround in MythTV if I did not
have the one test recording that clearly and unambiguously states the name of
each channel as it plays. Apparently, by luck or by design, the MythTV people
have stumbled onto a way to play these types of recordings correctly. If they
have figured it out, I would think it's not an impossible thing for someone
who understands what they are doing. But that said...
I know nothing about this subject at all. However the discussion reminded me
of something that could possibly be relevant.
Steve Harris has one or two LADSPA effects for working with Dolby Surround,
which may be what you're talking about here if I understand the most recent
post correctly (I have not been following the thread)
. Perhaps talking to him about this could be informative?
http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html#tth_sEc2.102
Then again, maybe that's the wrong tree to be barking up entirely, but I thought
I'd point it out just in case it was good for something.
Regards,
Luke
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