[ecasound] Fun with the PAN -epp command

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Subject: [ecasound] Fun with the PAN -epp command
From: Neil E. Klepeis (nklepeis@uclink4.berkeley.edu)
Date: Tue Feb 29 2000 - 11:46:50 EET


I am playing stereo and mono mp3 files, and trying to get reasonable pan

Here are three chain definitions that I pass to ecasound for a stereo
mp3 file (with a Perl script):

1. -a:0 -f:16,2,44100 -i TESTstereo.mp3 -ea:100 -a:0 -o /dev/dsp1
2. -a:0 -f:16,1,44100 -i TESTstereo.mp3 -ea:100 -epp:100 -a:0 -o
3. -a:0 -f:16,1,44100 -i TESTstereo.mp3 -ea:100 -epp:0 -a:0 -o

#1 plays the stereo file with no problems. The instruments that I
orginally recorded have their original panning.
#2 results in nothing (i.e., no sound).
#3 plays the mp3 file at what appears to be half speed.

Now for the mono mp3 file:

4. -a:0 -f:16,2,44100 -i TESTmono.mp3 -ea:100 -a:0 -o /dev/dsp1
5. -a:0 -f:16,1,44100 -i TESTmono.mp3 -ea:100 -epp:0 -a:0 -o /dev/dsp1
6. -a:0 -f:16,1,44100 -i TESTmono.mp3 -ea:100 -epp:100 -a:0 -o

#4 plays the file at double speed (I guess I expected something weird)
#5 plays the mono file in center field (it should be hard left)
#6 results in no sound.

Another thing: I (for some reason) subsequently put a -f:16,2,44100
option in the output part of the chain for #5 and #6, and everything for
#5 was in the left ear (I still heard nothing for #6).

Am I using the -epp command incorrectly? How do I go about panning a
mono or stereo file? Can I pick out the left or right channel of a
stereo file and then pan it left or right?

I'm still getting used to this whole thing, so please bear with me if
I'm missing something stupid.



Neil E. Klepeis, School of Public Health, UC Berkeley, USA

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