Hallo > I'm converting NTSC DV material (720x480 interlaced 29.9fps, a lot of > movement, shot from a handheld while walking) to standard-compliant > SVCD. > While playing with mpeg2enc parameters, i tried to compare various -I > options. Apparently, -I 2 looks worse than -I 1, which is not what i > expected after reading the man page. > The beginning of the movie with -I 2 is very, very bad, but after one > second the image becomes gradually clearer, the blockiness dissapears > gradually. Yet still, it looks like -I 1 provide an overall less > blockiness even way after the beginning, the image seems to be clearer. > The difference is small though. > Did i misinterpreted the manual? > > Here are the relevant parameters: > > mpeg2enc -v 0 -f 4 -F 4 -n n -o "aniv".m2v -a 2 -I 2 -S 795
2 Things: The code activeted when using the -I 2 option is not that much optimized than the code of the -I 0/1 option. As you can find out on your own in the manpage, the -I 2 need more bandwith. Because it encodes each field-by-field and not frame-by-frame. So you would need more bandwith to achive the same quality. If your video alreaddy needs much bandwith (limited to 2500kBit) you will see more arefacts. There was a reason why the field-by-field encoding as activaed, I do not rember why, but you will find that in the mailing list archive. auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard ------------------------------------------------------- This SF.NET email is sponsored by: FREE SSL Guide from Thawte are you planning your Web Server Security? Click here to get a FREE Thawte SSL guide and find the answers to all your SSL security issues. http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0026en _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
