On Thursday 26 Aug 2010, Thomas Hilber wrote:
> When I started to setup my VDPAU machines (end of last year) I
> first made sure that the Xserver really is running a 50Hz modeline.
> I mostly play 25/50Hz streams. This way I found an Xserver
> bug/misbehavior. Only if I explicitly set the modeline params manually
> in xorg.conf I get real 50Hz output (instead of 60Hz).
> Please see attached my xorg.conf. Always try:
> DISPLAY=:0 nvidia-settings --query RefreshRate
> to verify. Even the Xorg.0.log lies about the fact that 50Hz are active
> but in reality it uses 60Hz. Maybe nVidia has fixed that in the
> After this tuning to a channel with live ticker gives me perfect
> results. There is not any judder at all.
> The problem with all this juddering is that the symptom 'judder'
> alone gives you no hint at all about the root cause of the problem.
I've been following this thread with interest... I had been happily
running vdr-1.7.0 with a Matrox G450 video card, softdevice, and a CRT TV.
At first, I was using a home-built VGA-SCART lead (these cards can
generate composite sync so no need for combining sync signals), and then I
found a VGA-sVideo cable (came with a similar graphics card at work,
Then my old TV blew up and I now have a full-HD LCD TV. I've been using
the same setup with the new TV and it still works pretty well for the SD
signals I can currently receive.
HD is starting to appear in the UK and it seems like a good time to
replace my current P4-based vdr box with a smaller, low power unit, and an
Nvidia ION systems seems to be the current option (although a lack of PCI
slots is a tad worrying, at least for the small form-factor boards!).
A couple of quick questions...
What is the "best" method for my current SD broadcasts: home-made VGA-
SCART lead or HDMI? (Do any of these boards have sVideo these days?)
Do I run the X server at the SD resolution or at 1920x1080 and let xine
rescale rather than the TV?
I'm guessing run the X server at 1920x1080 and then both SD and HD work
easily together (with full HD OSD?).
I toyed with the xine and the xineliboutput plugins a _long_ while back:
which is the easiest option for getting VDPAU working?
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