--- On Fri, 28/1/11, Lucian Muresan lucianm@users.sourceforge.net wrote:
From: Lucian Muresan lucianm@users.sourceforge.net Subject: Re: [vdr] Deinterlace video (was: Replacing aging VDR for DVB-S2) To: "VDR Mailing List" vdr@linuxtv.org 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