[Pkg-alsa-devel] Bug#663239: mplayer opens audio device in 48000 Hz for 44100 source material

[Uoti Urpala]

On Sat, 2012-05-12 at 12:52 +0200, Kurt Roeckx wrote:
> On Sun, Apr 15, 2012 at 07:17:34PM +0300, Uoti Urpala wrote:
> > This is expected behavior with ALSA dmix. It has a fixed hardware output
> > frequency, in your case 48000 Hz.
> 
> As far as I know this is just a default and has nothing at all to
> do with what the hardware supports, it's just a value in a config
> file.

I meant it's fixed for each dmix instance; when ALSA dmix is using a
hardware frequency of 48000 Hz, everything will be resampled to that.
You can configure dmix to use a different frequency, but it won't adapt
based on source audio.


> I know all this.  That doesn't mean things can't be improved.

Well, it certainly sounded like you didn't know all this; if you did, I
can't see why you wrote "The problem now is that mplayer does this in
libao2/ao_alsa.c:" in the original message, or reported this against
mplayer2 at all (in addition to libasound2). What could be improved in
mplayer2?