[mythtv-users] VDPAU datapoint

[Jean-Yves Avenard]

Hi

2009/2/22 Kevin Bailey <ke-myth at retriever.dyndns.org>:
>
> For de-interlacers, one-field was ok but it was "fuzzy" and
> had some aliasing. Bob 2x HW "pegged" the CPU. Temporal 1x HW
> was better, but the second time going through all the
> de-interlacers, it pegged the CPU too, so not sure if maybe
> Bob would work if I tried again. Advanced 1x HW pegged the
> CPU. Temporal 2x HW exitted the first try, but took the second
> try. Didn't try Advanced 2x.
>

There's no reason why using any deinterlacers would *pegged* the CPU ;
everything is done through the GPU..

> I've left it on temporal 1x but I can't say that I'm impressed
> with the quality. There seems to be more tearing when the
> video pans left and right (versus software). It's more like
> "shearing", with an inch of video being to the side of the
> next inch for a split second. I don't seem to get it with the
> software linear de-interlacer.

You will get tearing unless you disable composite.

>
> For settings, I have enabled real-time threads (although
> I'm certain its actually taking), extra audio buffering,

You shouldn't ; in my experience it creates problem and can hang X for
a few seconds.

> and warn on no audio output. I have disabled use video
> as timebase, always stream from backend, OpenGL vertical
> sync for timing, and picture controls.

>
> I have nothing like "composite disable" in xorg.conf.
> I have the VGA port connected to a 1080p LCD.


Then don't be surprised you're getting tearing


> horsepower, I would say, "Don't bother as the de-interlacing
> is nothing to write home about." (then, I have a 8500GT) but
> if you have a struggling CPU, or want to go the $100 STB
> route, here's your ticket.

It's because you didn't get the deinterlacers going properly.

The one thing interesting for me with VDPAU is the quality of the deinterlacers.
Advanced 1X or Advanced 2X gave the best result.

I'm not a fan of the Temporal one ..
Jean-Yves