Hi all > I've been running some more tests using mjpegtools 1.6.2 and have a couple > of questions regarding some odd effects I've seen when the result was played > on a PAL DVD player. ... > : > Another thing I noticed about this DVD is that motion is sometimes > noticeably jerky on hardware players. It's most noticable when the scene > pans to follow a speaker (it's a conference DVD): the background doesn't > flow smoothly but appears to jump. I think the effect happens with all > movement though - it's just most noticeable when there's lots of it. We're > not taking about excessive movement here - just someone walking in front of > a background which was perhaps 10m behind.
I think I've at least partially solved this problem. Over the weekend I tried encoding with the the "-z t" mpeg2enc option and the result was noticeably better when played back on the hardware player. mpeg2enc claimed the frame order of the incoming stream was bottom first, so the above option reversed the field order. Although some jerky motion remained (particularly in the movement of the background during panning) it was nowhere near as bad as it was before utilising this option. I'm not entirely sure how or where the fields got reversed. The material was coming from a DV-encoded Quicktime file produced from a DVD by cinelerra as previously discussed. Grabbing frames from this Qt/DV file seemed to indicate that the field order was correct - there was no "backwards" motion when skipping through the fields. Perhaps the field order put into the Qt/DV file by cinelerra was wrong, or maybe lav2yuv was doing something funky - I haven't as yet had a chance to investigate furher. It may be that some of the field-related options of yuvcorrect might impove things further - again, I will attempt to test this over the next few weeks as time allows. Regards jonathan -- * Jonathan Woithe [EMAIL PROTECTED] * * http://www.physics.adelaide.edu.au/~jwoithe * ***-----------------------------------------------------------------------*** ** "Time is an illusion; lunchtime doubly so" ** * "...you wouldn't recognize a subtle plan if it painted itself purple and * * danced naked on a harpsichord singing 'subtle plans are here again'" * ------------------------------------------------------- This SF.Net email is sponsored by Sleepycat Software Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to deliver higher performing products faster, at low TCO. http://www.sleepycat.com/telcomwpreg.php?From=osdnemail3 _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
