DivX to mpeg2 is choppy

[pennst26]

I have alot of divX movies, that I am trying to encode to SVCD. When I encode them with TMPGENC it results in a choppy movie, by choppy I mean that it plays fine for a few seconds then speeds up and goes back to normal again throughout entire movie.

Here is what I have been doing:

Virtualdub says avi is 23.97 fps, then I save/convert WAV to 44100
then I use SVCD(NTSC-film) in tmpgenc

Tried several different bitrates, but even the higher bitrates do this.
Tried to do 2pass VBR, but tmpgenc just shows black screen when encoding, and source position stays at zero.

After reading around here, I think the problem may be field order, or telecine.

How do I find out what to put my settings on for a divx???
Which field order for which divx?? Is there a program that will tell you this???

Is there an easy solution to this??

[Solnzevo]

NTSC will be 30 frames/second, if u choose 23,9something this is the speed for a classic celluloid cinema movie. - I guess u have to convert it first. Good luck!

[fantomlord]

I have alot of divX movies, that I am trying to encode to SVCD. When I encode them with TMPGENC it results in a choppy movie, by choppy I mean that it plays fine for a few seconds then speeds up and goes back to normal again throughout entire movie.

Here is what I have been doing:

Virtualdub says avi is 23.97 fps, then I save/convert WAV to 44100
then I use SVCD(NTSC-film) in tmpgenc

Tried several different bitrates, but even the higher bitrates do this.
Tried to do 2pass VBR, but tmpgenc just shows black screen when encoding, and source position stays at zero.

After reading around here, I think the problem may be field order, or telecine.

How do I find out what to put my settings on for a divx???
Which field order for which divx?? Is there a program that will tell you this???

Is there an easy solution to this??

If your source is 23.97 fps, then it is NTSC film, and you can use the TMPG SVCD NTSC film template which will allow a 3:2 pulldown on playback--which will convert back to 29.97 fps(NTSC)
when doing 2 pass VBR, when TMPG makes its first pass, it is analyzing the movie, and deciding how to allocate the bits, therefore it is not doing the encoding yet, and the screen will be black, and the source position will not change. when it hits 50%, the actual encoding will start, and the movie will show up on the screen and the source position will begin to move.

[bugster]

Actuall, pennst26 is quite correct in saying that 23.976 fps is the frame rate for NTSC film format, which happens to match film frame rates. In order to playback at full NTSC speed of 29.97fps one of two things could be done.

1) Your player recognises the 23.97fps format and automtically applies the relevant correction (3:2 pulldown) in order to play at 29.97fps

2) Your encode process adds in the 3:2 pulldown flags that your player uses to play at 29.97fps.

I notice that the Tmpgenc template for SVCD NTSCfilm does not apply the 3:2 pulldown flags (advanced tab). You could try re-encoding with this box checked as your player may be struggling to do the process correctly

[pennst26]

k, re-encoded it using SVCD NTSC(film), and flagged 3:2 pulldown and 2passVBR Avg=1950kbs

And it was worse! The movie was choppier than ever. every half second it skips ahead.

My source settings are:
Video: Noninterlaced (progressive)
Field Order: Top First
Aspect:1:1 VGA
(Not sure where else to set these cause I'm not sure what they mean.)

File Info from virtualdub:
Frame Size, FPS: 576X304, 23.976fps
Decompressor: DivX MPEG-4 3920 Low
Keyframes: 1911

How do I find out what to set the source at??? Interlace, noninterlace??Aspect???

[bugster]

One question, is this the first time you have played a home made SVCD in your DVD player. If so, maybe you could try them in a friends player if any one has one that will support the format. Or maybe try VCD. Not so great quality but less compatibility issues.

One other thing you could try that sometimes makes a difference. Encode video only with TmpGenc WITHOUT the 3:2 option set. Then run the resulting file thru pulldown.exe (find it in the tools menu to the left) to apply the 3:2 pulldown flags. re-mux the audio and burn. I do this with DVD's and it seems to give smoother playback than using TmpGenc, but the difference is minimal and not as bad as the problems you are describing when using TmpGenc. Might be worth a try tho

[pennst26]

One question, is this the first time you have played a home made SVCD in your DVD player. If so, maybe you could try them in a friends player if any one has one that will support the format. Or maybe try VCD. Not so great quality but less compatibility issues.

One other thing you could try that sometimes makes a difference. Encode video only with TmpGenc WITHOUT the 3:2 option set. Then run the resulting file thru pulldown.exe (find it in the tools menu to the left) to apply the 3:2 pulldown flags. re-mux the audio and burn. I do this with DVD's and it seems to give smoother playback than using TmpGenc, but the difference is minimal and not as bad as the problems you are describing when using TmpGenc. Might be worth a try tho

No, I play them all the time (good ole Apex).

Baffled now, because every divX I have so far burns great using the NTSC template. Not NTSC(film) though, and the divX is 23.976fps. Why is that??? Isn't 23.976 Film??? Why would it work with a 29/30fps template???

Oh well, at least it works, just set my understanding svcds back a ways.