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
Greetings,
I am playing stereo and mono mp3 files, and trying to get reasonable pan
effects:
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
/dev/dsp1
3. -a:0 -f:16,1,44100 -i TESTstereo.mp3 -ea:100 -epp:0 -a:0 -o
/dev/dsp1
#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
/dev/dsp1
#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.
Thanks,
Neil
-- ___________________________________________________________ Neil E. Klepeis, School of Public Health, UC Berkeley, USA http://socrates.berkeley.edu/~nklepeis http://eetd.lbl.gov/ied/era/exposuremodeling/ nklepeis@uclink4.berkeley.edu 510-848-5827 ------------
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