[mythtv-users] PCI, S-Video, VDPAU, SDTV, interlaced CRT: what card?

Brian J. Murrell brian at interlinx.bc.ca
Wed Dec 16 11:09:00 UTC 2009

On Wed, 2009-12-16 at 01:08 -0500, f-myth-users at media.mit.edu wrote: 
> Even though this is -already- an interlaced TV and the original
> (pre-H.264 content) is interlaced SDTV from PVR-250 capture, I have
> been given to understand that I -still- want to run a deinterlacer,

The technicalities of reality aside, I think this concept is bogus.
De-interlacing source material only to have it "re-interlaced" as it
goes back to an SDTV is just bogus, wasteful, and likely a degradation
of signal.

> so I don't have to worry about out-of-order fields.

This seems like a silly reason (again, technicalities and reality aside)
to de-interlace.  Is it really technically impossible to (_always_) give
the interlaced material to the video card such that it displays it in
correct field order?

> I want the best
> interlacer possible

I think what you really want is interlaced material given to the video
hardware so that it always displays it, in it's interlaced glory, in the
correct field order.

> ---I'm very sensitive to video quality,

Right.  Which is why, IMHO, you want to avoid all of this de-interlacing
and re-interlacing.

> I would prefer fanless if at all possible.  I assume I need at 512MB
> of memory at least (even for SD?).

AFAIU, all of the VDPAU capable cards are digital TV out only -- HDMI
and/or DVI.  No more analog TV support.

FWIW, I'm pretty much in the same boat as you.  PCI/AGP mobo, SDTV,
using a 5200FX right now, but this FE is also my BE, running an 800MHz
Athlon and at times, recording three PVR (a 250 and 500) streams at a
time.  The FE is quite acceptable but does "struggle" when everything
gets going at once and I think VDPAU would help out a lot here too.

So I will be interested in following this thread -- as much as I think
the majority of this community is now using flatscreen, digital, HDTV
sets that can display truly progressive output, so de-interlacing has
value and the sights on analog SDTV output is just fading.


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