[MPlayer-users] audio filters drain the cpu

[Fredrik Eriksson]

Rich Felker wrote:

>On Wed, Dec 14, 2005 at 09:22:26PM +0100, Fredrik Eriksson wrote:
>  
>
>>playing a audiofile like
>>
>>mplayer music.mp3
>>
>>works just fine, without any notable cpu usage. However, trying to use a 
>>audiofilter, like
>>
>>mplayer -af sub music.mp3
>>
>>or
>>
>>mplayer -af surround music.mp3
>>
>>the cpu usage goes up to over 90% (amd64 3500+). This happens both with 
>>pre7 and the cvs. I'm starting to think this is a alsa problem, but I 
>>    
>>
>
>If you think it's an ALSA problem why not try -ao oss and see if the
>problem goes away? That would narrow it down a lot.
>
>Rich
>  
>
the thing is that oss does only support stereo, at least with my 
soundcard (soundblaster live 5.1), and there is no problem with stereo 
audio with either alsa or oss (even swapping right and left channels is 
no problem).

Fredrik