Florin Andrei wrote: > Actually, I'm concerned with an issue that I've seen before with MPEG2 > streams generated with mpeg2enc and some DVD players that follow the DVD > standard specifications very literally (e.g. JVC XV-N55) - during some > scenes when there's a lot of motion, the image stutters.
Steven has already raised a number of possible causes, but there is another one. The material which exhibits this problem - any chance it was a DV encoded file (a Quicktime/DV file perhaps) itself encoded using libdv or ffmpeg? If you're producing footage from Cinelerra for example this is probably what you're using. The libdv DV codec has a problem with interlaced material which becomes visible as flickering/stuttering during times of high motion. ffmpeg's DV codec is better (in that the effect is much reduced) but there are still issues. The visibility of the problem does depend on the DVD player used: on some it's bearly visible, on others it's painfully obvious. Note the libdv *decoder* is fine - the problem only affects the encoder. If this is the root cause of your problem then it's a libdv issue and has nothing at all to do with mjpegtools. My observations are that this libdv issue is unlikely to be addressed anytime soon since it seems the developers don't have the time to track the problem down. If libdv2 happens (a major rewrite) it might be addressed there. In the meantime I will probably end up switching to cinelerra-cvs, use its yuv4mpeg2 pipe render option (which mainline cinelerra doesn't have yet), and encode straight to MPEG2 that way. Going via an intermediate uncompressed yuv4mpeg2 file isn't an option unfortunately due to a lack of hard disc capacity. Regards jonathan ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
