TMPGEnc Problem - What's Causing the Jumpiness?

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Hi,

I'm having a hard time getting good results on Mpeg encoding using TMPGEnc. The problem is that I could not get rid of the jerkiness of scences with moving objects. I'm converting from avi captured from a Sony DV using VideoWave III. The video (avi) played smoothly in VideoWave. But when I converted avi to mpeg, objects in movie seem to be jumping, as if frames have been dropped. They do not move across the screen smoothly.

I have searched archives from this forum and read tips about interlacing. I tried to change the field order in TMPGEnc's setting and the results seemed to be same. I'm using 25fps because I'm trying to make VCDs in PAL. I'm wondering what part I was doing wrong?

Knowing this problem, I still went ahead and burned a VCD using Nero 5.5. The jumpiness is the same on TV.

Any inputs will be appreciated!

Chunyu

-- Chunyu (supraz@mailexcite.com), September 07, 2001

Answers

if the frame rate of your source video is not 25 fps, this will cause the problem you have. TMPGenc can be used to convert NTSC frame rates to PAL, for example, but the quality is poor. I don't know of any tool that can do this kind of conversion well. An alternative approach that would work better is to buy a card like the Dazzle (www.dazzle.com) DVCII. You could record directly to PAL format from your Sony DV source and the results should be OK in terms of jumpiness. However, I have been told that DVCII is not real good for MPEG-1 video, so consider that before you buy it. I've seen samples of MPEG-2 video captured with Dazzle and they look fantastic.

-- Jason (Jason.Shumate@equant.com), September 07, 2001.

If you indeed have DV AVI files and want to convert them to another framerate and resolution successfully (25 to 29.97, 480 to 576 or vice-versa) http://www.dynapel.com sells s/w that does just that and more.

-- Mehmet Tekdemir (turk690@yahoo.com), September 08, 2001.

Chunyu

The reason for the jumpy across screen motion is that VCD is not designed to cope with interlaced vision. Its the reason I went out of VCD homebrew's to SVCD in late 1999. SVCD uses Mpeg2 and will play interlaced vision correctly. Your not going to easily succeed in Mpeg1 to stop that jumping off the screen until you get into SVCD and then you will get playback as smooth as a babies b..b. Fact of life more or less in this business.

-- Ross McL (rmclennan@esc.net.au), September 13, 2001.


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