[mythtv-users] PVR250 + TVWonder = jerky

Isaac Richards ijr at po.cwru.edu
Wed Jun 4 02:15:11 EDT 2003


On Wednesday 04 June 2003 12:18 am, Bruce Markey wrote:
> Vincent AE Scott wrote:
> ...
>
> > so then i tried switching over to mpeg4, and the jittery playback
> > suddenly ceased.  that was with the new option both enabled and
> > disabled.  so it looks more likey that the problem is with the rtjpg
> > codec.
>
> Confirmed. One potential problem that I'd seen, and Mark
> Chou pointed, is that prebuffering and rebuffering may be
> contributing to choppiness for Live TV. RTjpeg writes
> larger files so more data to move through the buffers.
> If I use RTjpeg at low res for local live TV, I see 90%+
> idle CPU but it's constantly pausing to prebuffer. I
> hadn't been testing with RTjpeg so thanks for pointing
> this out.

Hm.  Does changing line 363 of nuppeldecoder.cpp to:

    ringBuffer->CalcReadAheadThresh(12000);

help any?  Not that that's an actual fix, but I'd like to see..

Isaac


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