Re: [timidity-talk] Out of sync playback with ALSA sequencer on Debian

[TAMUKI S. <ta...@li...>]

Hello,

From: Bill Carson <bil...@ou...>
Subject: [timidity-talk] Out of sync playback with ALSA sequencer on Debian
Date: Sun, 24 Aug 2014 12:29:01 +0200

> If I play the files without using the ALSA server:
> 
> timidity -Os filename.mid
> 
> the playback is fine.  If I play the files with the ALSA server:
> 
> aplaymidi -p 128:0 filename.mid
> 
> there is a lot of jitter and the notes are out of sync.  This happens
> both with aplaymidi as with other applications (e.g. games running in
> dosbox and wine).

Perhaps, TiMidity++ ALSA sequencer interface has been running as a
system service (like this: timidity -Os -iA) on Debian Wheezy/Jessy.
Please try out adding "-B2,8 -q0/0" options.  The fragment size is
adjustable.  The smaller number gives better real-time response.
Adding "-B2,9" might be a good idea.

$ timidity -iA -B2,9 -q0/0 --sequencer-ports=1 -EFresamp=1 &
...
Requested buffer size 4096, fragment size 2048
ALSA pcm 'default' set buffer size 4096, period size 1364 bytes
TiMidity starting in ALSA server mode
Opening sequencer port: 128:0
$ aplaymidi -p 128:0 filename.mid

Regards,
TAMUKI Shoichi