Yes, it's a good idea to get 1:1 pixel mapping on your display. Double scaling (first pc, then display) is not a good idea, ever. But, some problems arise: HDMI uses DVI signalling for the video (and audio is hidden in a vertical blanking time slot believe it or not) so it may seem like just another connector.. however in their finite wisdom the HDMI standardization people decided that HDMI will not support arbitrary resolutions, but instead only the existing (and back then, planned) broadcast resolutions: - 576i/p (pal) and 480i/p (ntsc) - 720p (1280x720) - 1080i and 1080p (1920x1080) The world is full of TVs with 1366x768 and other weird resolutions. There are also plasmas with 1024x768 etc "standard computer resolutions". The big surprise to many people is that even though DVI signalling could carry these native resolutions, the displays themselves won't accept / sync to them. And they don't advertise them in the EDID data so you have to force your computer to that resolution / refresh to even try it (and fail). The only true 720p displays I have seen are rear-projection TVs and data/av projectors. They will accept their native resolution of 1280x720 over HDMI, however getting rid of overscan to get 1:1 is another matter.. Then a solution: I used to have a Panasonic plasma with a similar non-standard resolution and I used the VGA port with it to automatically get a 1:1 pixel display as it's intended for PC display use. Yes VGA is not optimal but at that resolution and a 1 meter cable, who cares... Today I have a full HD 1920x1080 panel with an option for "exact scan" which gives me 1:1 pixels (without overscan) out of the box over HDMI, I just run normal 1920x1080@60Hz out of my computers. And finally a question: If someone can tell me how to get 576i over HDMI out from VDR, please do. That way I could use my external HQV Reon video scaler to upscale it.. Of course it would need to allow me to switch modes for 720p and 1080i also based on broadcast resolution ;) - Vaizki ________________________________ From: vdr-bounces@xxxxxxxxxxx [mailto:vdr-bounces@xxxxxxxxxxx] On Behalf Of Scott Sent: 6. tammikuuta 2009 6:30 To: vdr@xxxxxxxxxxx Subject: 1:1 pixel mapping - a waste of time? As Im just starting to get vdr working, I was wondering if 1:1 pixel mapping between the video card (nvidia onboard HDMI output) and my flat panel (Samsung plasma) is a waste of time. When looking at a "computer" generated image like the desktop, its going to make a difference, but with broadcast material (SD mostly), I imagine that the material is scaled anyway to fit the resolution of the panel (which in my case I think is 1024x720, but that has a bit of overscan). So it wont be 1:1 anyway, or am I wrong here? I know this is a bit off topic, but there seems to be a fair bit of experience here. -- Scott _______________________________________________ vdr mailing list vdr@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr
