--- On Sat, 22/1/11, Niko Mikkilä <nm@xxxxxxxx> wrote:
> From: Niko Mikkilä <nm@xxxxxxxx>
> Subject: Re: Deinterlace video (was: Replacing aging VDR for DVB-S2)
> To: "VDR Mailing List" <vdr@xxxxxxxxxxx>
> Date: Saturday, 22 January, 2011, 17:17
> On 2011-01-22 08:16 +0100, Thomas
> Hilber wrote:
> > On Wed, Jan 19, 2011 at 12:42:40PM +0000, Stuart
> Morris wrote:
> > > conversion and then draw the first field to the
> frame buffer. At the next
> > > vertical sync the shader would convert the second
> field and draw that to
> > > the frame buffer. With VDPAU is there a new
> OpenGL interop function that
> >
> > that's not the whole story. You still have to consider
> synchronicity between
> > incoming data rate (TV-stream) and outgoing data rate
> (VGA/Video timing).
>
> Yep. As Stuart said, framedrops/duplicates will happen, but
> with his
> drawing technique they don't cause the player to lose field
> sync. I
> think that's already quite acceptable, since at least
> recordings can be
> played without any video judder if audio is resampled.
>
> --Niko
Standard definition video is going to be harder than I thought.
I used xrandr to set this mode via HDMI to my LCD TV:
# 1440x576i @ 50Hz (EIA/CEA-861B)
ModeLine "1440x576" 27.000 1440 1464 1590 1728 576 581 587 625 -hsync -vsync Interlace
The TV reported mode 576i ok, but the desktop graphics were unreadable.
I tried to view an interlaced standard def video using my little test application and it looked awful.
However the 1080i mode worked very well:
# 1920x1080i @ 50Hz (EIA/CEA-861B)
Modeline "1920x1080" 74.250 1920 2448 2492 2640 1080 1085 1095 1125 +hsync +vsync Interlace
I think for standard definition video via HDMI there will be a need to
upscale to a resolution better supported by HDMI and that requires
inverse telecine and deinterlacing. This may still be within the
capabilities of todays low power systems.
My little test has staisfied me that 1080i or 1080p video can be displayed
with interlaced output.
Stuart
BTW my hardware setup was an old Sony KDL32V2000, and AMD HD4200 integrated graphics with the AMD closed driver.
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