XviD settings

[snowbeach]

First of all a big thank you to the developers of XviD for a great codec. The new codec comparison of Doom9 made me take a closer look to XviD. And I am more satisfied with the results I got from XviD than with the results of DivX505.

At the moment I use GKnot 0.28.1 and the XviD codec build 03052003-1 by Koepi.

My question is regarding the possible settings in XviD.

Doom9 used in his last comp test the following settings: motion search precision 6, quant type: MPEG, VHQ mode: 1, Quarterpel and chroma motion checked, Maximum B-frames: 2, B-frame quantizer ratio: 180, B-frame quantizer offset: 0, Below i-frame distance: 0, Bitrate payback delay: 500 and proportional payback. Nothing else is touched, everything else is by default.

But in one of his XviD guides he uses the following settings that differ to the settings used in the comp test: B-frames disbaled (Maximum B-frames: -1), Below i-frame distance: 10, Bitrate payback delay: 250 and payback with bias. I do not use the Alt. Curve System here. Nothing else is touched, everything else is by default.

I use Neutral Bicubic resizing.

Are their some recommended settings by the developers for the Xvid codec that can be used nearly for every movie? Of course to get the best out of the codec to get HQ and MPEG4 compliant encoded video.


PS: Beat me, if this question has been already asked this way or if I sould not ask questions like this! :D

[frodoontop]

If you want to use Quarter Pell, it's not a very good idea to use MPEG-quants, better use H263. When not using Quarter Pell, Mpeg will be more detailed. I'll give you my settings. Which have been influenced by Koepi's recommendations. :cool:

Motion Search: 6
VHQ-mode: 4
MPEG
Use chroma motion
B-frames: 2-150-100-255
Payback proportionally.
All the rest= Default settings

If this is to slow for your opinion, lower the VHQ-setting. Naturally, it compresses better with VHQ, but not too much.

[snowbeach]

Encoded my test vob your way and it looks fine. It looks smoother than the one encoded with Doom9 comp test settings! Why?

[frodoontop]

Qpel is quit heave to decode. (To encode as well) Maybe your system isn't fast enough on certain scenes to decode it at the resolution you used.
If you lower the resolution of the video it should be just as smooth. However, don't go lower than 512,xxx. Lower than that and things are getting ugly.
<Edit>On second thought, I think you mean the kind of sharpness, right? Qpel is delivering sharper pictures, but as the test by doom9 shows, it's not perfect yet. Things have to be improved to convince me to use it.</EDIT>

[snowbeach]

Yes, I meant the sharpness of the picture.

[frodoontop]

You can always get a sharper picture by using LanczosResize instead of Neutral Bicubic.

[Teegedeck]

Originally posted by frodoontop
If you want to use Quarter Pell, it's not a very good idea to use MPEG-quants, better use H263. When not using Quarter Pell, Mpeg will be more detailed.

Really? Have I missed out on something?

[Sharro]

Originally posted by Teegedeck
Really? Have I missed out on something?

http://forum.doom9.org/showthread.php?s=&threadid=50673

U prolly missed this. Even though I ain't that sure if a this time the results are still valid.

@snowbeach : read this thread http://forum.doom9.org/showthread.php?s=&threadid=52422

Koepi in his omnipotence posted recommendations to Iago.

Have a look at them... Try them... And draw your own conclusions :-)

Also have a look on how to post bugs. Resolution, first pass size, etc would have been valuable information for any further help.

All the best,

Sharro

May Xvid be with you!