[PlanetCCRMA] XMMS Skipping on MP3

[Jim Robinson]

Just wanted to respond back and say "Thank you" for the response. 
I could not get this software to load on my system but I suspect I could 
if I spent some time working with it.
I ended up using an external mp3 player to play mp3 into Ardour. 
Sometimes the easiest fix is the least obvious.

Jim

planetccrma-request at ccrma.Stanford.EDU wrote:
>
> Jim Robinson:
>   
>> Just wondered if anyone had come across this before....?
>>     
>
> Oh yes. :-)
>
>
>   
>> I have XMMS with mp3 support on a CCRMA FC8 install.  When I try and
>> playback MP3's via Jack into Ardour I get skipping.  Not often but
>> usually enough times to make it very hard to "play" an mp3 into Ardour
>> for recording over (maybe 1 time out of 8 will I get it clean).  I have
>> confirmed that this something in XMMS as I can disconnect Jack & Ardour
>> and it still does it.   I have also noted that when I close xmms one of
>> it's libraries remains resident and I have to manually kill -9 <pid>
>> otherwise Ardour gets sad and xruns on me.  All in all something is not
>> happy.
>>
>> I am not sure what's going on.  I do know that I had to go grab an
>> external version of libmad as when I issue this:
>> yum install libmad
>> It comes back as unknown - although this was a few months back and I
>> don't recall where I got libmad from now.
>>
>> Just wondered if anyone else had sen this/fixed this or perhaps has
>> suggestions as to what would be another Jack "aware" mp3 player I could
>> try when "playing" mp3 into Ardour?
>>
>> Any advice or thoughts gratefully received.
>>
>>     
>
> In case you are using that other xmms jack output plugin,
> I have found Gunter Geiger's jack plugin for xmms to work
> much better:
>
> http://gige.xdv.org/libjackasyn/
>
>
> But I have also hacked the source a little bit to add realtime
> priority to the audio decoding thread:
>
> kjetil at ttleush ~/site/src/xmms-jackasyn-0.3 $ diff -u audio.c~ audio.c
> --- audio.c~    2005-11-12 17:40:38.000000000 +0100
> +++ audio.c     2008-07-16 16:54:16.000000000 +0200
> @@ -530,6 +530,14 @@
>          fd_set set;
>          struct timeval tv;
>
> +        if(1){
> +          struct sched_param par;
> +          par.sched_priority = sched_get_priority_max(SCHED_RR);
> +          if(sched_setscheduler(0,SCHED_RR,&par)==-1){
> +            fprintf(stderr, "SNDLIB: Unable to set SCHED_RR realtime priority for the watchdog thread. No watchdog.\n");
> +          }
> +        }
> +
>          while (going)
>          {
>                  if (jackxmms_used() > prebuffer_size)
>
>
>
>
>
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> End of PlanetCCRMA Digest, Vol 6, Issue 11
> ******************************************
>