[pulseaudio-discuss] Need help to reduce delay with USB, mic using pulseaudio

Arun Raghavan arun.raghavan at collabora.co.uk
Fri Aug 12 00:10:10 PDT 2011

On Fri, 2011-08-12 at 12:32 +0530, Arun Raghavan wrote:
> On Fri, 2011-08-12 at 12:26 +0530, ashwanik wrote:
> [...]
> > I changed buffer-time and latency-time for different values in 
> > gst-pieline but no success. It reduces delay very less amount i.e delay 
> > is still there
> > (2-2.5 sec).
> > 
> > When I use alsasrc and alsasink with the same usb mic getting no delay 
> > with good audio quality.
> > 
> > Please help to solve the problem.
> I'm guessing the problem also goes away when you load your ALSA sink
> with tsched=0? Your ALSA driver is likely broken (don't know what kernel
> you're running -- might be an issue that's already fixed).

Ah, I missed that you're doing all this on a USB mic, so there's a
possibility the problem lies there, but I'm more inclined to blame your
playback for the delay. You could easily verify this by plugging a USB
headset that you can verify as working with low delays on a laptop. It
should also work the same way on the board, isolating the ALSA driver as
the cause of your problem.

-- Arun

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