Hallo > 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? You see if the maximal bitrate was reached when you multiplex the stream. (mjpeg-howto Section: Creating MPEG2 Videos and section: Optimizing the stream)
> 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 mplex audio and video. If you average bitrate should be about 20% lower than the maximal bitrate. If not, than you'll very likely see artefacts. To lower the bitrate you can set a lower quality factor (10,11), use yuvdenoise maybe yuvmedianfilter, and mpeg2enc -h/--reduce-hf For my experience using a other quantisation matrix might save some bitrate, but often it saves less that 0,5%. BTW: SVCD is by default for PAL 480x576, VCD PAL: 352x288 BTW2: You can save some bitrate when you use a lower (192,160) audio bitrate, and increas the video bitrate. auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard ------------------------------------------------------- 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
