On Saturday 16 December 2006 21:41, Yannick Patois wrote: > Hi, > > If I understand, PAL DVD format have 25f/s images, 720x576 pixels, and > 4:3 aspect ratio. But I also read that those are non square pixels (they > must be because 720/576 != 4/3), and that point is worrying me. > > As I'm creating my movie from images, what would be the best for me? > Should I keep rendering 640x480 images (4:3 aspect ratio) images with > square pixels and let cinelerra work from it? Should I render 720x576 > images with non square pixels?
I'll assume that you create you images with square pixels. Then the simplest approach that gets you closest to the expected result is to create 768x576 images and scale them to 720x576. (Cinelerra can do this for you, but I didn't find a straight-forward way to do it, so you may want to automate this outside Cinelerra). But this is just half the truth. Because a PAL frame's area that is to be mapped onto a 4:3 screen is actually taken from a 704x576 sub-area of the available 720x576. Hence, if you need absolutely correct aspect ratio, you better scale the 768x576 images to 704x576, and then add a black border of 8 pixels to the left and right to get the 720x576. But I doubt that you will notice a difference on a TV. -- Hannes _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
