[vlc-devel] vlc sound playback breaks for USB between ALSA 1.0.9b and 1.0.10rc2

[Matthew Hodgson]

Hi all,

I spent a while wrestling with getting audio playback to work with my 
M-Audio Transit USB soundcard today - when playing back 44.1kHz or 48kHz 
sound with ALSA ~1.0.10rc2 I was getting:

[00000838] main audio output debug: audio output is starving (35064), 
playing silence
[00000838] alsa audio output warning: recovered from buffer underrun
[00000838] main audio output debug: audio output is starving (32402), 
playing silence
[00000838] alsa audio output warning: recovered from buffer underrun
[00000838] main audio output debug: audio output is starving (41727), 
playing silence
[00000838] alsa audio output warning: recovered from buffer underrun

with --aout alsa and similar for --aout oss.  The timestamp diff in the 
starvation warning message is consistently ~40ms, and no sound was output.

VLC does however play back 22kHz files correctly (and at the right pitch).

I've reported this to the ALSA list 
(http://article.gmane.org/gmane.linux.alsa.user/20764), as the problem 
didn't happen with 1.0.9b - but as aplay and mplayer behave fine, i think a 
problem may hhave been exposed in VLC's aout code with the more recent ALSA. 
  This happens with all VLCs from at least 0.8.1 through to today's svn.

Any thoughts would be very much appreciated (and thanks again to those on 
IRC who gave assistance earlier :)

M.


-- 
______________________________________________________________
Matthew Hodgson   matthew at mxtelecom.com   Tel: +44 845 6667778
                 Systems Analyst, MX Telecom Ltd.

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