Quality Comparison Tests I did DiVX4 vs Divx311

[ElFarto]

I've been doing some quality comparison test between DIVX3.11 and DIVX4 and overall i've found that DiVX4 has serious quality problems no matter what method i used (GKnot, VirtualDub, AVIUTL) DiVX 4 files look horrible compared to the 3.11 , even when comparing divx4 at maximum supposed quality (2pass, slowest) vs DiVX3.11 Low Motion at 1 keyframe each 10 secs, both at 900 Kbit and 576x320 resolution, DIVX4 looks like sh*t,
I've been using Jurassic Park 3 for the test, the quality problem is pathetically visible on the first scenes of the film on the over the water flyby, where the "ISLA SORNA 207 miles west of Costa Rica" sign appears, on DIVX4 the mountain background is much blurrier and blockier than on DIVX3, and the sign letters are surrounded by noise introduced by the codec with DIVX4, (postprocessing is set to 2, i've tried with values up to the max and there are no changes), such noise is not visible or barely visible when using the 3.11 codec. I don't know if fault of the decoder part of the codec, or that DiVX 4 simply sucks.?
If this thread develops interest i'll post somewhere the screen captures of both codecs so you can see it for yourself.:mad:

[glenn]

These results sound utterly strange, and are completely contradictory to my own experiences... But post the screenshots somewhere, so we can have a look!

Perhaps others can do the same test with the same title too, to verify that this isn't a problem with your settings?

[kheperi]

My expirience is completely different. Encoding dvd-rips with 4.12 almost never shows any trace of noise and artefacts etc at all, even with lower bitrates. I did some experiments and only with bitrates lower then (roughly) 600 at sizes around 576x240 or so the imige starts to show shortcomings, when you have a close look. But i think its really possible to squeeze more then a 2 hour movie on 1 cd and still have a very good quality. Only a bit unsharp maybe (because of enlarging when playing back), but no ugly artefacting and noise.

I did 1 movie with the nandub methode and i didnt see any problems there too so the bottemline, i think, is that both methods are very good.

[ElFarto]

I'm preparing the screenshoots, let me add that when viewing the files not at full screen the artifacts are less visible, but at full screen DivX4 shows bleeds all around the letters,

[everwicked]

My expiriences differ also. I think it's your technique... DivX does not depend on the bitrate that much. It mostly depends on the quantizers. It's the quantizers the give the stunning quality.

Check my guide and try it this way. www.med.uoc.gr/~diamantop/ (http://www.med.uoc.gr/~diamantop/)