I have a 10 minute final segement recorded with Sony Dig-8 via Pinacle DV200 firewire in, via a Premiere edit, output to bbMPEG configured for SVCD which produces extremely bad jerky motion during slow motion sequences. Just simple cuts and disolves, however during 3 sequences of slow-motion at 40-60%, show up as severe "jerky" motion. In one instance the hand-held camera is locked on a sign on a parade float and when viewed, the sign is rock solid center frame while the background jerks along at an unacceptable rate, almost stroboscopic. Otherwise the Nero-ready MPG viewed from ATI's AIW 7.0 file viewer is an almost exact replica of how the SVCD appears on an Apex 600A, so something is happening in the MPG generation it appears. The cuts which are rendered and marked at full speed seem exact replicas of the original AVI - very good quality. Only a problem with the slow motion.

I made the changes to the settings regarding Pel Movement and Auto Set CBR but I could not tell a difference in the "jerks" with this and the default setting.

Anyone know how to de-jerk it? I get similiar results using bbMPEG or TMPGEnc. Thanks!!!!

-- Don (donphillipe@hotmail.com), April 06, 2001

Answers

Does the original *.avi (if you exported to an intermediate *.avi before input to bbMPEG) also have this jerky thing?? Premiere does caution that using slow motion produces interpolated frames, which, depending on the source video conditions and how slow you want it to get may produce blurring and jerkiness on the output file.

-- Mehmet Tekdemir (turk690@yahoo.com), April 07, 2001.

Normally (before trying this VCD/SVCD "exercise") I viewed my production in Premiere's monitor window and once acceptable, I used Export to Tape to write it back to the Sony Dig-8 tape. Then I used the analogue outputs on the camera to play into a SVHS recorder. The motion has always been smoothe until I now convert it to MPG1/2 for burning to VCD/SVCD. Note that when viewed on the PC, the MPG file about to be burned is jerky as well but slightly less pronounced. Guess the screen size has a lot to do with it.

I assume going to analogue somehow has been smoothing out the Primere "jerks" before now. So from what I am hearing it was the analogue process that is missing and slow motion in a strictly "digital" process does not really exist???

Thanks for the good answers you keep adding here, by the way!

-- Don (donphillipe@hotmail.com), April 09, 2001.