Problem with persistent scaling/shifting in RADEONDisplayVideo()
xorg-driver-ati at toh.cx
Tue Jul 29 04:47:15 PDT 2008
[something went wrong with my last post - 'From' as first word
in a line broke it?!]
On Tue, Jul 29, 2008 at 08:11:21AM +0200, Michel Dänzer wrote:
> On Tue, 2008-07-29 at 01:43 +0200, Roland Scheidegger wrote:
> > "high quality" and "RGB/PAL" doesn't really fit in the same sentence if
> > you ask me...
> Probably nothing beats a good TV when it comes to de-interlacing etc.,
> so it makes sense to preserve the broadcast signal as much as possible.
> I assume that's what 'high quality' refers to in this context.
that's exactly what I wanted to say. Of course our solution can't be
better than RGB-SCART itself.
But until now almost all VGA-based softdecoder solutions had to
deinterlace in software.
What makes not much sense if right after this the VGA CRT controller
re-interlaces the frame again. By doing so considerable CPU power is
wasted for getting even worse picture quality.
As mentioned above here are some further explanations:
With my patch we can grab the untouched fields right after the software
decoder and route them straight through to the VGA port.
You then ideally display the fields on a native-interlace-capable
device like a CRT.
I've heard that more recent LCD displays also produce attractive picture
quality on SCART input. Though at the expense of huge amount of signal
On Tue, Jul 29, 2008 at 01:43:51AM +0200, Roland Scheidegger wrote:
> you ask me... Decent TV hardware should have at least VGA inputs, and
> it's not CRT based it doesn't make sense in the first place...
for building a linux based PAL satellite recorder SCART is still
superior to VGA. That's why we want to play SCART over VGA. Of course
this changes if HDTV comes into play.
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