Subject: [ecasound] recording large audio files (was: Re: Question to developers of sound editors.)
From: Kai Vehmanen (firstname.lastname@example.org)
Date: Tue Jun 05 2001 - 01:31:48 EEST
On Mon, 4 Jun 2001, Jay Ts wrote:
>> freeze up while recording an hour of music. We really
>> need something that can handle large stereo files.
> If all you want to do is record live audio, there is
> a very simple command line utility called "wavrec" (I
> wavrec -b 16 -s 44100 -S filename.wav
ecasound -f:16,2,44100 -i /dev/dsp -o filename.wav
Now I just couldn't resist the temptation. ;) Now if wavrec and other
simple tools handle the job, why use 'monsters' like ecasound? Well, a
quick list of what you get by doing the above with ecasound:
- ecasound can provide double-buffering (-z:db)
- lock-free communication between disk and audio threads (-z:db)
- support for realtime scheduling (-r)
- better control over buffering done by soundcard
drivers (-b:bsize and -z:intbuf + -z:nointbuf)
- support more other formats than just 16bit/stereo (32bit, multich, ...)
- support for OSS, various ALSA versions, aRts (C-API), LADPSA, LAAGA, ...
- support for various file formats other than wav (mp3, ogg, libaudiofile)
... and even with the simple use case above, these options can be useful.
If for nothing else, then for recording reliability.
> to record in stereo at 16-bit and 44.1 KHz. You just
> give it a Control-C to stop it, although this will cause
> the header info to not match the actual length of the
> recording (not usually fatal).
Like with ecasound except ecasound handles the wav header properly. ;)
> Or you can use the -t option to specify how long to record.
Same -t option works with ecasound (-t:rec_len_in_seconds).
Also, few things about ecasound that are not often mentioned:
- easy to install (rpms and debs available, _very_ few dependencies)
- up-to-date documentation (man pages in sync with the CVS-tree)
... now it'd be great if more Linux distros included the basic ecasound
package. This would be especially useful for scripting audio tasks.
Dependencies shouldn't be a problem (basicly just ncurses and even that
can be turned off). I guess the biggest problem is the binary size...
(about 1,1MB). But oh well, we'll see what happens... enough for the
marketing speech... :)
-- http://www.eca.cx Audio software for Linux!
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