On Thu, Sep 09, 2004 at 01:22:45PM -0700, Mark Knecht wrote:
On Thu, 2004-09-09 at 12:32, Eric Dantan Rzewnicki
wrote:
On Thu, Sep 09, 2004 at 11:21:35AM -0700, Mark
Knecht wrote:
On Thu, 2004-09-09 at 11:02, Eric Dantan
Rzewnicki wrote:
ecasound!
ecasound -a:1 -i:mono1.wav \
-a:2 -i:mono2.wav \
-a:1,2 -f:24,2,96000 -o:stereo.wav \
-a:2 -erc:1,2 -eac:0,1
Thanks. I'll give that a try. At least that handles
step one, assuming
no audio problems are created.
If step 2 was downsampling to 16 bit 44.1kHz, then
just change the -f
above to: -f:16,2,44100 ... sorry I missed that bit.
Eric,
How would I be sure that my emerge of ecasound uses libsamplerate
capabilities? Can this be observed at runtime? Or in the output files
somehow? Anywhere else?
Anyway, If I'm going to downsize from 24-bits to 16-bits then I want
to add dithering, but I see no mention of dithering in man ecasound. I
know jack has an option to dither it's outputs, but from some dark
remote part of my memory I seem to remember that this only effects the
output going to the sound card and not what's going to a file. Comments
anyone?
Here is one way to be sure ecasound uses libsamplerate:
ecasound -f:16,2,44100 -i:resample-hq,auto,hi-quality.wav -o:lower-quality.wav
The resample-hq input object type, with the auto flag, is a special type
that causes ecasound to automatically read the format of the input .wav
and resample it using libsamplerate to match the format set for the rest
of the chain. I imagine the above command will fail if ecasound is not
compiled with src support. There is a similar resample object that uses
the internal linear interpolation. For both object types auto can be
replaced with the actual sample format if your input file format lacks
that info. One example would be raw input files.
Rewriting the earlier example, your whole conversion can be done with
one commandline:
ecasound -f:16,2,44100 \
-a:1 -i:resample-hq,auto,mono1.wav \
-a:2 -i:resample-hq,auto,mono2.wav \
-a:1,2 -o:stereo.wav \
-a:2 -erc:1,2 -eac:0,1
(untested, but as far as I know, it should work)
-Eric Rz.