pulseaudio and adder stream latency
Stefan Sauer
ensonic at hora-obscura.de
Wed Feb 12 18:59:04 CET 2014
On 02/09/2014 05:38 PM, lsmithso at hare.demon.co.uk wrote:
> Can you give me some idea how I might debug this? What should I look
> for in the debug output?
I'd grep for 'clock' and then master/slave/select. Also check if there
is anything in the WARNING level.
You could also try setting provide-clock=false to force a system clock
(timer) and see if that's any better (if it is as bad as before then te
audioclock is good, but slaving does not work as it should).
Stefan
>
>
> Stefan Sauer writes:
> > On 02/02/2014 05:42 PM, lsmithso at hare.demon.co.uk wrote:
> > > Hi: I'm using gstreamer 0.10. liveadder made no difference at all. I
> > > tried all kinds of combinations of the clock-source, do-timestamp and
> > > latency properties , but it made no difference. I don't really
> > > understand the clocking stuff, so this wasn't very scientific.
> > The interesting properties are "provide-clock" and "slave-method". To
> > debug this one would need to figure which elements (sink, src1, src2)
> > provides the clock and why the others don't sync to that properly.
> >
> > >
> > >
> > > I also tried mixing both streams on to themselves. It wasn't perfectly
> > > in sync, butt it wasn't bad, and it certainly didn't drift by
> > > seconds.
> > >
> > > I tried swapping devices around, but I got the following error.
> > >
> > > ERROR: from element /GstPipeline:pipeline0/GstAudioConvert:audioconvert0: not negotiated
> > > Additional debug info:
> > > gstbasetransform.c(2525): gst_base_transform_handle_buffer (): /GstPipeline:pipeline0/GstAudioConvert:audioconvert0:
> > > not negotiated
> > Ideally you use a "audioconvert ! audio/x-raw, ..." after both sources
> > to ensure you have the same format. adder does not convert.
> >
> > Stefan
> > >
> > > Is there a clue there. Recording works if the 1st element device is
> > > the output monitor, and the second is the mic. The above error happens
> > > when the 1st element is the mic and the 2nd the output monitor.
> > >
> > > Stefan Sauer
> > > > On 01/31/2014 09:49 AM, lsmithso at hare.demon.co.uk wrote:
> > > > >
> > > > > Hi:
> > > > >
> > > > > I'm trying to record headphone output and mic input simultaneously to
> > > > > a single file, using pulseaudio streams and the adder plugin.
> > > > >
> > > > > The problem is that the recording of the sink rapidly lags behind the
> > > > > source, eventually by several seconds. The result is that the
> > > > > headphone and mic recording are completely out of sync.
> > > > >
> > > > > Any idea of what causes this and how to fix it? Here's the pipeline:
> > > > >
> > > > >
> > > > >
> > > > > gst-launch -q -e pulsesrc device=2 ! adder name=mix ! audioconvert ! vorbisenc ! oggmux ! filesink location=r.ogg pulsesrc device=3 ! mix.
> > > > >
> > > > >
> > > > Hi,
> > > > is this with gst-0.10 or 1.X? Btw. it is not latency that your are
> > > > seeing, sounds more like clock drift perhaps. I wonder which of both
> > > > sources is providing the clock. Can you swap device=2/3 and retry?
> > > >
> > > > Stefan
> > > > _______________________________________________
> > > > gstreamer-devel mailing list
> > > > gstreamer-devel at lists.freedesktop.org
> > > > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> > >
> >
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> > gstreamer-devel at lists.freedesktop.org
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>
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