jerky playback on fast pan

[jtp]

Hi,

I have copied some dv containing a few scenes with fast pans to dvd via Ulead videostudeo 8. I have burned the DVD-R using the Ulead burner that comes with Ulead. When I play this back on my Philips DVD player it is perfect but when I playback on a Sony or a Marantz DVD player the fast pans produce a very jerky picture. When I burned the same video to DVD+R it is fine on the Philips and Sony (I haven't been able to check it on the Marantz). Can anyone explain why this happens? Thanks

[thor300]

Strange one, how does it play in the PC? Try it in PowerDVD. It could be bad media (maybe your sony and marantz dont like your -Rs) and it could be wrong field order, you can change it with Pulldown.exe using the -tff switch. Still strange that it plays fine in the Phillips, and that +R made a difference with the Sony, but wrong field order would be my best guess anyway if its not the media, i know i would give it a try, if for nothing else then at least to satisfy the curiosity . Syntax:
pulldown.exe "inputfile" "outputfile" -nopulldown -tff even (or -tff odd)

[flaninacupboard]

don't know how good the encoder in ulead is, could be creating a file not quite in DVD spec. fast pan needs higher bitrate, it could be going over the max bitrate. some players don't have any problem with this - others will skip and jump as you describe.

[jtp]

In PowerDVD the picture is not jerky but the edges of objects (such as people on horseback) go a little jagged on the fast pans

[flaninacupboard]

sounds lke a field order issue then, have you tried following thors' advice?

[thor300]

There should not be jerkiness in PowerDVD if the field order is correct. I am on new ground here, i have never tried to play a DVD with wrong field order on standalone DVD player, so i cant say for sure how standalones behave. Fields have some kind of parity bits i think, i know some video apps, like AviSynth, can determine fieldorder by the parity bits, that could be the case also with some standalone DVD players, given that DV and DVD has a similar way of handling fields in interlaced footage. Too technical for me, maybe some of the resident gurus can give some tech info on this subject, for example Adam if he happen to read this thread.
Even if a standalone could detect field order in some cases, why did your Sony behave differently with -R and +R media? Your problem is somewhat interesting, hope you post back with your findings when you solve it.

[flaninacupboard]

well, DV video is always bottom field first so you should set your encoder to that. however if field order is wrong (jerky in power DVD, and jerky on pans) then all player should be affected, not just some. unless some of your players are hooked up through progressive scan?
but there again you have different results with different media. keep plugging at it, let us know if you crack it. if anyone else with the same problems reads hopefully they'll chip in.