--- On Fri, 28/1/11, Lucian Muresan <lucianm@xxxxxxxxxxxxxxxxxxxxx> wrote:
> From: Lucian Muresan <lucianm@xxxxxxxxxxxxxxxxxxxxx>
> Subject: Re: Deinterlace video (was: Replacing aging VDR for DVB-S2)
> To: "VDR Mailing List" <vdr@xxxxxxxxxxx>
> Date: Friday, 28 January, 2011, 11:37
> On 28.01.2011 10:57, Stuart Morris
> wrote:
> [..]
> > 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 guess that's because it's a very strange resolution with
> strange
> aspect ratio, shouldn't that have been 1024x576i to
> maintain a 16:9
> aspect ratio with square pixels? I only found 1440 on BBC
> HD which
> broadcasts in 1080i but sets the aspect ratio flag to
> 16:9...
>
> Lucian
The HDMI spec has a minimum pixel clock rate, such that modes like 576i
and 480i must repeat horizontal pixels to maintain a pixel rate above the
minimum. There is also an embedded information field in the HDMI link that
tells the HDMI sink (the TV) which pixel(s) to discard. There appears to
be no way to control this information and the graphics card I assume is
interpolating horizontally anyway (not repeating). This might explain why
the display looked so awful.
Stuart
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