[mythtv-users] Choppy video on Pundit&pvr350 backend&frontend system

[Henk Poley]

Op dinsdag 27 april 2004 01:36, schreef Robert Rozman:
> Hi,
>
> I'm having choppy video playback of live tv and all recordings on Asus
> pundit (P4 2.4G and Suse 9.0).

Seems like my setup. I run it with a Celeron 2.4GHz and Gentoo.

> I've had problems with Xv not working, but got that to xvtest of 2400 FPS.

xvtest returns ~1800 here if I remember correctly. But x11perf -shmput500 
crashes with some odd thing about some X command not valid (can give full 
error message, but not now, system is off)

> I have HD with 40 Mb/sec (measured with hdparm).
>
> I'm running backend and frontend at nice of -19.

I never had any succes running the frontend at anything else than the default 
niceness. More prio would make it hick. Never tried renicing the backend 
though.

> I still get occasional 
> (every few seconds) freezes on video that shows as prebuffering pause in
> mythfrontend. I understand that probably backend is not providing data fast
> enough - but how could this happen? Playback (decoding of mpeg2) takes only
> 10-15% of CPU, I have pvr 350, so all resources should suffice for smooth
> playback - BTW streams from this backend play ok on EPIA M9000 and even in
> dsmyth (I have live tv stream at 3000 kbits/sec) on win32 laptop.

At -19, the highest priority, X will probably get starved since it is running 
at -10 (kernel 2.4) or 0 (kernel 2.6, when runlevel properly configured).

	Henk Poley <><