audio recording - how to record mic input and pipe the output to another program
2014-04
Hi everyone Im trying to follow a tutorial on generating truly random bits
How To Generate Truly Random Bits
This is the command from the tutorial but it does not work
rec -c 1 -d /dev/dsp -r 8000 -t wav -s w - | ./noise-filter >bits
I know i can record my mic input using
rec -c 1 no.wav
this is the command i tried using
rec -c 1 -r 8000 -t wav -s noise.wav | ./noise-filter >bits
but i get
root@xxc:~/cc# rec -c 1 -r 8000 -t wav -s noise.wav - | ./noise-filter >bits
rec WARN formats: can't set sample rate 8000; using 48000
rec FAIL sox: Input files must have the same sample-rate
I have complied noise-filter
I think the tutorial is using an older version of SOX and REC I'm using
sox: SoX v14.3.2 on Ubuntu 12.04 server
Can someone please help me ?
This command line has too many outputs listed:
rec -c 1 -r 8000 -t wav -s noise.wav - | ./noise-filter >bits
^file ^standard output
For a command pipeline, the only output should be the -
at the end. The rec
command interprets the noise.wav
parameter as an additional input, which will fail or produce bogus output. Try removing the extra filename (and other unnecessary/incompatible options):
rec -c 1 -t wav - | ./noise-filter > bits
Looks like your noise.wav is not at a sample rate that sox can record in, and sox requires both files to be at the same sample rate. You'll probably have to regenerate noise.wav at a higher sample rate.
I'm looking for an open source utility that can record all input and output audio simultaneously on Windows. Preferably each direction should be in its own channel, but a mono/joined stereo would also be fine.
Anyone knows of such a beast?