Herman Robak wrote on Tue, 22 May 2007 > On Tue, 2007-05-22 Terje J. Hanssen wrote: >> HDV 1080i uses a pixel resolution 1440x1080 on tape. The rectangular >> pixel aspect ratio h:v=4:3=1.33, so when displayed the video frame is >> scaled to an aspect ratio of (1440x1.33)x1080=1920x1080 or 16:9. >> >> What I wonder is:
>> >> 1) Does the HDV video frame imported to Cinelerra get a resolution of >> 1440x1080 with aspect ratio of 16:9 or does it being transformed to >> 1920x1080 resolution? If 1440x1080 is correct how can it possibly get a >> true 16:9 aspect ratio, if the display pixels itself is square and not rectangular? > > The display has to be stretched by the player. If Cinelerra is told > that the resolution is 1440x1080 and the aspect ratio is 16:9, it will > scale the image to fit the specified aspect ratio. > Yes, but is this managed by filling out with more pixels horisontally on the display? If I'm right the display pixels are square i.e on a UWXGA LCD 1920x1200 in aspect ratio 16:10=1.6 I can't see how else the video frame can get the right 16:9 aspect ratio geometry... > Everything in your project will have to take those non-square pixels > into account, as the "native" shape of the 1080i HDV pixels is > rectangular. The same goes for 4:3 DV, to a modest extent. > But SD DV25 PAL uses "almost square" pixels and its rectangular aspect frame 4:3=1.33 almost just come from more horisontal than vertical pixels 720:576=1.25 if I'm right here ... (?) > As long as you work with raster graphics, you can not expect this > complexity to be hidden from you, as rescaling is lossy, and should > be kept to a minimum. > > >> 2) If HDMI can be used instead of i.Link (1394) to import video to >> harddisk, > > I don't think you'll find HDMI inputs. Just like there are no > cheap and common VGA or DVI "grabbers". Those interfaces are one > way only. > HDMI input is available on Black Magic Design's "Intensito Pro" HDMI capture and playback card, but sorry, on several requests and interest from Linux users, they have not been willingly to support Linux so far. They look to be just as propriarity and Windows/Mac-only as Pinnacle has been (yes, I myself have a legacy DV500 DVD). My new Sony FX7 camcorder includes a HDMI output. As far as I've read, it supports uncompressed 1440x1080 output (possibly at 4:2.2 color sampling). HDMI out is also supported on new Intel Centrino Pro (Santa Rosa) platform for laptops using GM965/GMA X3100 and Clear Video, which is claimed to give a new and better video experience on laptops. >> what kind of video format does this result in. > > Raw RGB. But the disk would be too slow. > > -- > Herman Robak Thanks, Terje _______________________________________________ Cinelerra mailing list Cinelerra@skolelinux.no https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
