[pulseaudio-discuss] how's fighting rewind going?

Lu Guanqun guanqun.lu at intel.com
Fri Jun 17 00:13:42 PDT 2011

Hi David,

On Fri, Jun 17, 2011 at 02:31:41PM +0800, David Henningsson wrote:
> On 2011-06-17 02:21, Lu Guanqun wrote:
> > Hi David,
> >
> > How's your fighting rewind going?
> >
> > Now, I find there's a rewind flood in my environment, and it's doing a
> > rewrite rewind all the times. At the time of rewinding, the write index
> > is less than the read index.
> >
> > Do you have any idea what's going on? I'm only seeing this when I'm
> > viewing an 1080p MP4 file.
> >
> > Thanks!
> Hi Lu,
> My patches has been optimisations so far, which means that it's reducing 
> the amount of rewinds rather than eliminating them. With a slow enough 
> computer (for Intel, the Atom comes to mind), or lots of other things to 
> do for that computer (such as viewing an 1080p file?), the rewind flood 
> thing can still happen.

Oh, man, you totally got me. :) I'm playing 1080p on an Atom based machine.
I find the rewind flood on this platform. For 480p video, it works quite

> What client are you using to connect to PulseAudio? For gstreamer based 
> clients, my gstreamer patch was first applied upstream, then reverted 
> for reasons I don't fully understand. Applying it is likely to help 
> against rewinds. See bug https://bugzilla.gnome.org/show_bug.cgi?id=641072

Yes, I used gstreamer clients. FYI. The two patches on pulesaudio are
already applied.  However, no matter when I applied the gstreamer patch,
the rewind flood still can be seen.

As you said, you're doing optimizations. Is there a way to fully solve
this issue, or this is just a mission impossible per your understanding?

> -- 
> David Henningsson, Canonical Ltd.
> http://launchpad.net/~diwic


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