adh3d opened this issue on Dec 09, 2001 ยท 8 posts
doerp posted Tue, 11 December 2001 at 2:35 PM
Attached Link: http://www.enklave.com
Alright, lets get into medias res. The frame rate for video is exactly 59.94 fields p/s. DVD-Video disks can also contain movies at 23.976 fps which is nearly film speed. Film has 24 fps so for transfering film to video so one has to slow picture and sound down by 1000/10001 and dublicate a every fourth field to get the frame rate. On to the frame size: DVD-Video frames use 720 by 480 Pixel (NTSC) or 720 by 576 pixel (PAL) but use non-square pixel. In order to prevend your video to look kind of distorted you have to work with D1 (or CCIR 601) video that uses the slightley larger frame size of 720 by 486 (also non-square). So if you stretch a D1 image until the pixels are square the frame size will become 864 to 486. After finishing the movie you have to scale it sideways to 720 by 486 non-square pixels and then crop top and bottom 3 lines so you get the 720 by 480 pixels. But here comes another problem: Overscan. But I think this goes to deep...