[mythtv-users] Correctly behaving 576i (or 480i) from vdpau-capable chip?

Ronald Frazier ron at ronfrazier.net
Sun May 23 21:22:16 UTC 2010

On Sun, May 23, 2010 at 8:13 AM, Paul Gardiner <lists at glidos.net> wrote:
> Hi,
> New TV!!. So I want to build a new front end, mainly to be able
> to connect via HDMI. For the next year or so, I don't foresee
> having any HD content to play, so I don't need vdpau, but I'd
> like to build a vdpau-capable system for future proofing.
> For now though, with the entirely SD content (PAL 576i), I'd rather let
> the TV do all the processing (deinterlacing and scaling), and
> not use vdpau at all. I'm planning on using software decoding,
> the "2 x Interlaced" software deinterlacer, with X set up to
> a 576i mode. The TV accepts that mode via HDMI.
> So what I'd like to know, is whether the vdpau-capable chips
> can be set up to run that way. I know some chips/drivers
> don't support interlaced modes. In the past there were problems
> with nVidia cards and interlaced modes (although possibly
> only if using XVMC).

If I'm reading correctly, you want to buy a VDPAU capable card now but
let the TV do the scaling and deinterlacing anyway. Is there a
specific reason you want to take that approach? I welcome someone to
correct me if I'm wrong, but I believe the processing done by the
VDPAU card beats pretty much everything except (maybe) the highest end
TVs. Even the cheapest $30 G210 based chip can do Advanced 2X deint on
an SD stream (and every other deint on HD). I'm not sure what you'd
gain by ignoring the capabilities of the card you are already going to
be buying. I'm not aware of any significant VDPAU bugs in mythtv
either (I haven't encountered any in the last 5 months, and in fact
the OSD looks much nicer on a VDPAU system)


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