On Sat, 03 Feb 2007 16:20:40 +0000, ][ wrote: > Example 6. > > ,----- > | you have a 16:9 DVD containing a 720x576 MPEG2 stream as in Example 4, and > | you want to display it on a device that has a 640x480 resolution with a PAR > | of 1:1 (and therefore a DAR of 4:3). > `----- > > That (intended device) is for most LCD televisions and monitors, since > they have a PAR of 1:1. How about CRT monitors, televisions, and DVD > players?
hmm... further, is the Example 6 supposed to be the standard way to convert between 4:3 & 16:9 videos? I tried to apply the mechanism to convert a 640x480 @ 4:3 video back to 720x DVD video, but get a 720x540 one instead of the original 720x576. Why the difference? Here is how I calculate: The 640x480 @ 4:3 video has 60 pixels black border on top and bottom. So I "use the -j option to change the size of the input video before the zoom is performed. ", as in Example 4. That'll give me 640x360 @ 4:3. The output frame sizes would be width = 720 height = (PAR * width ) / DAR = ( 1/1 * 720) / (4/3) = 540 If there is no distortion during the 2 DAR conversion, the result should be exactly 720x576. What's wrong here? thanks -- Tong (remove underscore(s) to reply) http://xpt.sf.net/techdocs/ http://xpt.sf.net/tools/
