jitter problem

[herzblut]

im having a problem i cant seem to get rid of no matter what i try. i am capturing these 4 minute videos from a game with my ati card. the mpeg2 when done capturing is perfect, nothing wrong no problems. but for some reason every single time i try to encode it to divx OR xvid it comes out jittery as heck. the video jolts in movement areas. i dont get it. even deinterlacing it, or doing inverse pulldown, or without. i cant seem to get rid of this jitter in the video when i encode it to avi. what could be causing this problem, what can i do to stop it? someone please help me. I thought maybe it was cause i was using perhaps to high of a bitrate, tried lowering it no diffrence. i even tried leaving the video interlaced wich improved it somewhat but not enough (plus i cant leave it with those interlaced lines) im very frustrated with this.
i also just noticed some sticky topic in this forum saying no divx xvid or something about it. sorry a mod can move this topic to the right part of the forum if they wish (just please let me know were so i can find the answers)

[qlizard]

just a guess but this sounds like a field order problem. i know nothing about xvid or dvix but have seen numerous posts about mpeg problems being associated with using the wrong field order. i capture in mpeg and must use field order "b" or it is horribly shaky.

[herzblut]

well like i said.. the mpeg is fine. theres no shaking or jittering in the original mpeg2 file. only when i encode it to avi wouldnt have a clue how to set my ati video in to capture with field order b either. i know i can set the frame sequence for the P and B frames but dont know if that has to do with the field order b.

[DaveS]

what software are you using to encode the file to xvid/dvix?

[herzblut]

gordianknot, what i've always used.. im thinking of trying capturing with mjpeg codec in virtualdub like i usualy do when i capture movies. i dont usualy use the ati capture it never works right.. hopefuly that'l work. if not well back to the same problem.

PROBLEM SOLVED!
it turns out it had something to do with trying to use 23fps. when i used 23 fps either captured at 23 or captured at 29 and ivtc'd to 23 it would jitter like crazy. i captured them again with 29fps and left them at 29 ( and deinterlaced with ati's deinterlacer wich amazingly works well without frame dropping on the newer version) and they encoded to avi perfectly, no jitter at all. so i guess you realy cant capture and encode to avi with 23fps. well i know i cant anyways.