Am Sonntag, 5. Oktober 2003 10:48 schrieb Maarten De Boer: > Hello, > > I have been tranfering some DV recording to VCD and SVCD, and I am > a bit surprised by the result. I first created the VCD, with a non- > standard bitrate of 2500, and I was surprised how good it looked > (played with a DVD player on a TV). Then I created the SVCD (standard > settings). expecting it to be even better, but in fact it contained a > lot of artifacts (the wringling on large surfaces around borders, I > don't know the slang for) > > Now, I realize the SVCD bitrate has been a bit lower than the VCD > bitrate I used, but only slightly. Maybe the VCD is smoother because > I used yuvdenoise in the chain? Or maybe because the VCD resolution > is a lot lower, while this doesn't really matter on a TV set? Or > maybe I just did something wrong when creating the SVCD?
The VCD resolution is a quarter of the resolution of SVCD ( half width/half height) and you are using the same bitrate as for SVCD. This means that with the vcd-resolution the encoder has enough room for scaling the bitrate, the second try with svcd resolution most likely hits max bitrate all the time and is resulting in continous artefacts. Depending on your TV Set you may not recognize any horizontal resolution that is bigger than 352. And yes yuvdenoise could have had an effect to. What you want to try is: -K kvcd yuvdenoise for the svcd maybe cvd resolution for svcd (352x576) playing with -q value playing with max bitrate (if your dvd standalone can handle more than standard svcd bitrate you may want to set the max bitrate higher, giving the encoder more room. > I send you the settings I used. Any suggestions will be greatly > appreciated! > > Maarten > > cat oulala001.dv | raw2yuv -i 0 | yuvdenoise -F | yuvscaler -O VCD | > mpeg2enc -f 2 -b 2500 -s -H -B 224 -o video.mpg > > cat oulala001.dv | raw2yuv -i 0 | yuvscaler -M BICUBIC -O SVCD | > mpeg2enc -q 9 -f 4 -B 224 -I 1 -4 2 -2 1 -o > /mnt/winF/oulalaSVCD/svcd.mpg > You have set the -q value for svcd to 9 for your vcd experiment to 4 (standard) , this may have too an effect, beside the resolution and yuvdenoise. I'm no expert either but HTH. Steffen ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
