[mythtv] Dynamic Ringbuffer and prebuffering pauses.

Mark Buechler mark.buechler at gmail.com
Sat Dec 2 14:15:35 UTC 2006

This makes sense from what I've seen on some 720P content.. myth will drop
frames and then all of a sudden video will speed up for 1-2 seconds and
everything will be fine for 30-60 seconds until the next time the cycle
starts over.

- Mark.

On 12/2/06, Stuart Auchterlonie <stuarta at squashedfrog.net> wrote:
> On Sat, Dec 02, 2006 at 11:39:56AM +0000, Stuart Auchterlonie wrote:
> >
> > One thing I have noticed while testing is that if the video is
> > lagging behind then frames are dropped to make the video catch up.
> > This is what I would expect to happen.
> >
> > The problem i've noticed is that there is a delay between
> > the decision to drop frames and the frames being dropped.
> >
> > This leads to NVP overshooting the targeted sync, and then
> > not having enough video frames to display, thus leading to
> > a prebuffer pause.
> >
> I'll clarify what I mean by overshoot.
> Initially NVP is in the state where it requires frames to be
> dropped to correct the sync differences between audio and video.
> It drops frames until it believes the sync has been corrected,
> but shortly afterwards it hits the condition that the audio
> is lagging to much and thus frames have to be doubled to slow
> the video down to allow the audio to catch up.
> Make sense?
> Now the trick will be to stop it from dropping to many video
> frames when it want to resync
> Stuart
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