Converting DivX to Xvid or DivX to DivX in Virtual Dub

[OctoChops]

hey guys whats up, i've been comin to this site forever, god i love it and barely realized there was a forum so heres my problem and some Qs


I have some anime DivX episodes that I want to watch on my DivX Player. But they were encoded with some wierd psuedo 120fps thing. So my DivX player, (and every other software) reads it as 119fps. This is way too high for it and well it obviously lags out and doesnt do much.

I need to reconvert these files so that i can watch them! I've tried soooo many opitions in Virtual Dub and i just cant seem to get it right. I have tried doing Direct Stream Copy and Video>Framerate>convert to 30fps. But this doesnt work at all and just makes the movie file play slower. The framerate only seems to convert whenever i do a video processing mode.

I've decided that by reconverting it to Xvid or DivX then this would be lots better !!

I've gotten pretty far on doing reasearch and after LOTS of trial and error with DivX 5.1 and Xvid (not sure what version i got) I have come to a final conclusion. This conversion works GREAT! (both) but i am left with one slight problem

ARTIFACTING!!! (i think thats the name) Whenever there is a QUICK scene change, or the colors on screen change way too fast. All of these blocks come out for a split second and make it look fugly. It also seems that this artifacting begins to lag the video and the sound becomes off sync.

here are some pics. that i took of it



So in Conclusion, what do you all reccomend I do for this type of conversion? Am i going about it all wrong? Is their anyway to fix the artifacting. Oh and how does Virtual Dub handle 2 DivX passes?

THANKYOU! for helping if u choose to!

[willy_annand]

Welcome to the weird world of DivX.

DivX is primarily a playable format. Attempting to uncompress DivX always results in quality loss.

Uncompressing and then compressing again in DivX means twice the quality loss.

Given that DivX is a low bitrate, highly compressed format (at least the ones I have seen), you are lucky you have one that is watchable at all.

My best suggestion to people is stay away from DivX if you are going re-edit it at all. MPEG2 gives much much better quality, but at the price of file size. Kwag's KVCD TMPGEnc templates and AVISynth scripts help with the file size issue, but sometimes at the expense of the quality factor.

[Gazorgan]

120 fps? Never remotely heard of that. I've seen some 60 fps, which was basically Fields as Frames.

You can use AVISynth to decimate 120fps to 29.97 fps. You want 29.97 for a DivX player (25 for PAL land) to get the minimum of conversion artifacts from the player changing FPS on the fly.

The downside is no matter what you do you may have to re-encode = quality loss. You can try avifrate to force the issue in the AVI header. It's a free program, try it and see if it works (no re-encoding required). It's primarily designed to get captures to exactly hit 29.97 fps.