[pulseaudio-discuss] pulseaudio-discuss Digest, Vol 13, Issue 46
drew.hope+pulseaudio at gmail.com
Mon May 28 12:34:32 PDT 2012
On Mon, May 28, 2012 at 3:00 PM,
<pulseaudio-discuss-request at lists.freedesktop.org> wrote:
> The log just shows that the latency estimation that PulseAudio provides to
> VLC are unstable, showing a steep increase at nominal playback speed.
> If it keeps on happening all the time, something is clearly broken. It
> could be the audio hardware, the computer clock, the audio driver,
> PulseAudio or VLC. Being unable to reproduce your problem, I would not
> hazard a guess.
I've now confirmed identical behavior with mplayer (using SMPlayer as
front end). It also happens with system sounds as well
> There are however a few things you can try:
> - Configure PulseAudio to use the same sample rate as VLC does with the
> "pure" ALSA output. If that works, the problem is probably with the audio
> hardware or the audio driver.
Done. Both are currently set to sample at 48000. No improvement.
> - Try with all power management *disabled* and no other active
> application, to rule out scheduling problems.
No other applications are running. No change in symptoms. I believe
power management is disabled, but will confirm again.
> - Check that your computer clock is running properly, with reasonable
Confirmed to external clock over 1h, no drift noted.
> - Try with other file formats and codecs to rule out a VLC timestamping
> bug or corrupt input file.
Confirmed with multiple .avi, .mkv, .mp4, multiple files tested.
Many thanks for the response. I'm more than happy to post logs/files
as needed to help someone more familiar with this issue debug the
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