ASUSTeK Tiger LNA Hybrid Capture Device - signal unstable.

[Ant <v4l (at) symons.net.au>]

On Fri, 2007-03-16 at 04:02 +0100, Ra.M. wrote:
> Darren Salt ha scritto:
> > I demand that Ra.M. may or may not have written...
> >
> > [*huge* snip]
> >   
> >> When I watch some DVB channel Xine says: "the amount of
> >>     
> >  dropped frame is
> >   
> >> too high". It cannot be a performance problem; my PC has a
> >>     
> >  CPU AMD64 4200
> >   
> >> X2 2200MHz+2200MHz, video card nVidia GeForce 7600 GS (driver
> >>     
> >  nVidia) and
> >   
> >> kernel 2.6.20 configured as SMP.
> >>     
> >
> > It could well be a performance problem, despite your belief to the
> >  contrary.
> >
> > I find that Xv works well, normally taking about 30% of CPU time (2GHz
> > Sempron, running at 1GHz due to cpufreq; Radeon 9200, untainted), xshm
> >  works
> > reasonably well but OpenGL is slow, presumably due to colourspace
> >  conversion
> > requirements. (XvMC and XxMC don't work here.)
> >
> >   
> 
> As I have specified in a previous message, under Windows XP (software
> CyberLink Power Cinema) the signal is perfectly stable.
> 
> It seems that with the Linux driver the tuner loses sensitivity.

I think you mean something different by performance problem. It may be
an issue with your video card drivers, or the method of 2d acceleration.
For example my system is running a nvidia chipset card with a dual core
Athlon  (at)  2.2ghz. I had a problem with my vendor video drivers and I
ended up with a screwy driver installation. This was not obvious when
using office type apps, but my TV viewing ran badly, and my cpu peaked
out at 100%. After some digging I worked out what was wrong and fixed
the video drivers. I can now watch HDTV with proper acceleration at
around 13% cpu. This is an example of a performance problem that is not
the fault of V4L, and was present even though the hardware was well
capable. Run top in a terminal while watching tv and see if your system
load goes above 1.00 or cpu usage maxes out. If it does then you'll see
what process is using all your resources and can diagnose it more from
there. 

Ant

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