A Virtual Audio Loopback Cable
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Usage
vsound [options] program arguments
options:
-f, --file=FILE output file name
-v, --verbose set to verbose output
-k, --keep-temps don't delete temporary files
-h, --help this help message
-V, --version show program version
-r, --resample resample the output file to the given sample rate
eg. vsound -r 44100 realplay file.rm
-d, --dspout enable simulateous output to /dev/dsp and file
(may be required for some programs)
-s, --stdout write the intermediate (Sun AU format) file to stdout
(no other output file is generated)
-n, --no-convert do not convert the AU file to WAV
-t, --timing add timing delays to allow recording of streaming data
-a, --autostop=SEC kill the player after 'SEC' seconds of inactivity.
Once you have the vsound program installed you can use the following command to convert a realmedia file to a WAV file. This conversion process is completely silent. You may not even need a sound card and kernel sound module although this hasn't been tested.
vsound realplay realmediafile.rm
New
in version 0.3 is the capability of doing sample rate conversion
on the output file. The following command will ensure that the
output file is a 44.1kHz sample rate WAV file.
vsound -r 44100 realplay realmediafile.rm
Warning:
If you use --resample/-r when the input and output rates are
equal, sox will fail to convert it and vsound will delete the
output file. I suggest unless you are sure the sample rates
are different that you also use the -k switch when using -r.
This will tell vsound to keep the temporary file which you can
then manually convert with sox if the resample fails. If anyone
has a fix or an idea for a fix for this, please
email
me. If
you
would like to listen to the file while it is being recorded,
you can use the dspout mode. In this mode, the audio data is
simultaneously recorded to a file and output to /dev/dsp. Please
note that if you are using the Enlightened Sound Daemon, you
may need to disable it before using vsound in this mode.
vsound -d realplay realmediafile.rm
Finally,
the Realplayer sometimes expects the audio data to be consumed
by the soundcard at a specific rate. This is particularly true
of files with URLs like "pnm://somewhere.com/file.rm" and "rtsp://somewhere.com/file.rm".
For files of this type there is a new option in version 0.5 which
adds timing delays keep the realplayer synchronised with the stream
it is playing.
vsound -t realplay realmediafile.rm
where the realmediafile.rm might contain one or more URLs of the above type. Autostop
-a / --autostop option Richard's original email describes it best;
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