kotrtim
8th January 2006, 17:30
http://www.mir.com/DMG/aspect.html
found this website and got some numbers for SAR
* 525-line (NTSC): 10:11 / 4:3 * 16:9 = 40:33
* 625-line (PAL): 59:54 / 4:3 * 16:9 = 118:81
Well if I have a 720x480 NTSC, if its encoded at full resolution without resizing the sample aspect ratio should be set to 40:33.
But if I have already cropped the 720x480 down to 720x384 without resizing, what is the Sample aspect ratio? I don't think it is still 40:33, isn't it?
Is there a methematical formula to calculate SAR?
DAR is much simpler and easy to understand, but it seem x264, mp4box only support SAR
Thanks..
found this website and got some numbers for SAR
* 525-line (NTSC): 10:11 / 4:3 * 16:9 = 40:33
* 625-line (PAL): 59:54 / 4:3 * 16:9 = 118:81
Well if I have a 720x480 NTSC, if its encoded at full resolution without resizing the sample aspect ratio should be set to 40:33.
But if I have already cropped the 720x480 down to 720x384 without resizing, what is the Sample aspect ratio? I don't think it is still 40:33, isn't it?
Is there a methematical formula to calculate SAR?
DAR is much simpler and easy to understand, but it seem x264, mp4box only support SAR
Thanks..