Strange jittering on playback...

[dizidave]

I have done a test rip of a DVD (about 5 mins) and encoded to SVCD using TMPGenc....I used DVD2AVI to frameserve the .vob file....

everything seemed togo ok until playback...

when i play the svcd in my standalone dvd player (after burning with nero) fast parts of the clip....for example, someone running, seem "jittery".

I dont really know how better to explain it....

any ideas how to get rid of this? if it wasnt for this the final quality looks pretty damned good...can anyone help here please?

Could it be something to do with interlacing or something?? i dont really know what that is.

Thanks all

[poopyhead]

dizidave,

look at your video output settings? did you have your output video as interlaced or 3:2 pulldown?

it could be you got the field order mixed up in source video settings. try switching the field order and enocde again. then burn on cd-rw and test it.

[kmmoore]

Dizidave,

I see someone already answered you question, and I'm sure that he is correct in that your field order is reversed and hence the jitter. However that sort of pre-supposes that you know what interlacing and fiels order are. Basically your TV shows its image on screen by "mixing" 2 images, showing first one, then the other. This is called interlacing, and each image is known as a field. Known as either upper field & lower field or sometimes Field A & Field B.

Consequently, when you try to play the SVCD back, the TV is getting these fields in the wrong order, resulting in your sharp, but jittery motion. You will see this more markedly on motion scenes and also panning scenes.

To correct it you can do as poopyhead says, re-encode but reversing the field order (it is always a VERY good idea to test a small clip with CDRW first to save wasting time and CDRs). Or you can use a neat little utility called MPEG Fixer which is a part of a suite called DVMPEG and what this does is scan and reverse the field order of an MPEG you already have without re-encoding (amongst other things).

If you want to try the MPEG Fixer route let me know and I'll point you in the right direction of where you can get it.

I hope this wasn't too "simple" an explanation, and no offence was intended if this was all old hat to you.

Best of luck,
Kevin.

[movienut2002]

I think you could be referring to the same problem I have had with tmpgenc. Under the settings then video tab then at the very bottom - motion estimate search - If this is set to (motion estimate search - fast) then you will get jitteryness on all your movies. It allows for faster encoding, but produces cruddy results. Try using high quality or highest quality to produce better video.

Tmpgenc uses motion estimate search fast as a default on most of its templates which produces the jittery video if you don't change it.

It anyone else knows of any other solutions - please post em.

If this wasn't you're problem - sorry to bother.

MNUT

[poopyhead]

movienut2002,

best setting for motion search accuracy would be high quality (slow)....the highest quality (slowest) setting is a waste of time cuz it produces very little improvement and adds like 8 hrs of encoding time.