Tmpg - Jerky Video

[bhoy]

I have been using Tmpgenc for quite a while (various versions)

I always encode at highest quality,and I am currently encoding to dvd.

I've found that any parts in the movies which have a slow panning shot is jerky. When watching tmpg encode a movie (sad i know) the jerks seem to correspond with the frame changes.

Has anyone else noticed this and is there anything I can try to make the movie run smooth.

I have an Athlon 1700xp and am encoding to 7200rpm HD.

I have installed the nimmo pack and every other codec I can find.

It jerks both on my pc and my standalone. Please help guys as because I know it happens I can't watch a movie for trying to see if it's jerky.

Thanks in advance for any help

After reading another post regarding stuttering video in which the poster had tried changing the field order to field b and it appeared to work for him.

I tried changing the field order with no effect. I then found I was converting a Ntsc avi to Pal DVD. I tried converting to To Ntsc dvd and it worked a treat. Is this a fault in Tmpg?

Now can I ask is there a way to change Ntsc avi to pal avi before encoding with Tmpg.

Sorry for this long post but it may help someone else.

[ZenZen]

I also have a problem with jerky video, mostly percieved when the camera is panning. This jerkiness is CYCLIC, which makes me think it is an NTSC to PAL conversion problem.
Scenerio: I capture video from cable TV using a Matrox Marvel, which produces a MJPEG AVI. On some, but not all captures, a cyclic jerkiness is noticed when the camera is panned from right to left or the other way. So this is not a TMPEnc problem, as we are still at the AVI stage. Stepping through the panning section frame by frame using VDUB, I see that the cyclic jerks are actually video that is blurred or out of phase. If I delete these bad frames, the video is then OK but the audio is chopped. I see it on the original TV broadcast, though not as acutely noticeable as in my
SVCDS (maybe the TV is more forgiving). Now, since I am watching the cable tv broadcast in Australia, I assume the transmitted picture would already by in PAL. My theory for the above problem is that the suspect footage (documentary or whatever) was filmed in NTSC, and the jerkiness that I am seeing is a result of watching it on a PAL system. Therefore, it would be of no use to try and convert the cable tv transmission from NTSC to PAL as it probably already is (jerky) PAL......
Any thoughts or comments greatly appreciated.

[bugster]

Yep, NTSC to Pal conversion is one of the common causes of the jerky video described. It is caused by TmpGenc inserting duplicate frames in order to generate the required number of frames (from 23.97fps to 25fps). So what you are seeing is a duplicate frame every second or so. The only answers to this are 1) Don't convert unless you have no choice or 2) convert properly using on of the conversion guides on this site.

Hope this helps

[ZenZen]

Thanks bugster for confirming this.
But your reply raises more questions

1) If it is caused by TmpGenc, do other encoders do the same thing
(Eg CCE)?
2) Since I am capturing cable TV in Australia (PAL), and the program was probably created in NTSC
(Eg a USA documentary), how is it transmitted here? In PAL or NTSC?
3) What would happen if I used the SVCD NTSC TmpGenc template instead of the PAL template?
(I'll try this, first chance I get).

Thanks in advance........

[bugster]

To answer your questions as best I can:-

1) Yes, other encoders will do this or if not, simply change the header info so that your 23.97 fps video is played at 25fps with subsequent loss of audio sync.

2) If captured in PAL, encode as Pal. If NTSC footage is played on a PAL TV system (such as yours in Aus or here in the UK) I am sure the TV companies do a proper conversion, this usually involves speeding up the playback so as not to insert the extra frames and processing the audio to match. Its funny how Pal versions of commercial NTSC DVD's have a 4% shorter playing time!

3) If your capture was PAL and you encode using NTSC templates in TmpGenc, frames will be lost and it will still probably look jerky.

[bugster]

To answer your questions as best I can:-

1) Yes, other encoders will do this or if not, simply change the header info so that your 23.97 fps video is played at 25fps with subsequent loss of audio sync.

2) If captured in PAL, encode as Pal. If NTSC footage is played on a PAL TV system (such as yours in Aus or here in the UK) I am sure the TV companies do a proper conversion, this usually involves speeding up the playback so as not to insert the extra frames and processing the audio to match. Its funny how Pal versions of commercial NTSC DVD's have a 4% shorter playing time!

3) If your capture was PAL and you encode using NTSC templates in TmpGenc, frames will be lost and it will still probably look jerky.