Optimisation xvid codec for ultra low bitrate

guada · 22nd May 2004, 16:48

Hello,

I know Xvid codec is not recommended for this job, but i would like to know another settings which allowed it to work in ultra low bitrate.

My setting for Xvid devapi-3:

MSP:6UH
QT:h.263
VHQ:4
Max Internal:240
Chroma Motion
BFC: 1/146/73
Quantizer restriction: 2/4/2/14
Quantizer matrix: matrix anime for low bitrate or fox home entermaint for higher
Max flow overflow..: 5/5
Chroma optimizer / Trellis quantisation

Sorry for my english and, thanks for your answers.

Teegedeck · 22nd May 2004, 18:48

You're right; it isn't recommended.

Those quantizer limitations of yours are contradictory to encoding at low bitrates. You're better advised to encode your first pass at quant=3 and perhaps use that same quant as minimum quant for second pass. But don't set maximum quants.

guada · 22nd May 2004, 20:20

Thanks for your propositions.

I'm going to try it.

Note:
I asked this question because at 7kbps avi and audio , Xvid test settings devapi-3 is better than RV10e, but lesser than VP6 and the leader h.264

A très bientôt - a little french would be welcome..

bond · 22nd May 2004, 23:16

and as xvid does not preprocessing itself its propably a good idea to use some avisynth filtering

guada · 23rd May 2004, 21:49

hello Teegedeck an Bond,

I tested the Xvid codec according to your suggestions.
I could notice an appreciable difference of visual aspect.

later,i tried the last Xvid codec improved by koepi.
In a word: FABULOUS
Koepi, made a big work on the speed and touch chromatic (a few more sharper than the customary);
Even if (only to myself), the devapi-3 Xvid codec stay the must (Xvidement parlant) for treatment on ultra low bitrate.
In fact, that guaranted the respect of the sharper and the natural aspect of the video.

While waiting for the visit of JM ROTA in the next months, the Xvid final is going well;
To be continued...

If I tell nonsense don't hesitate to correct myself.
I just wonder if a codec which makes a real work in HDV reproduction, can also be revealed an excellent tools of video compression for low bitrate.

Teegedeck · 23rd May 2004, 22:04

I think the XviD team is always happy about such nice feedback.

Please note that Koepi is one member of the team, but he is one among many (hard-working and gifted people, all of them!).

Greets,
Tee

22nd May 2004, 16:48	#1 \| Link
guada Registered User Join Date: May 2004 Posts: 185	Optimisation xvid codec for ultra low bitrate Hello, I know Xvid codec is not recommended for this job, but i would like to know another settings which allowed it to work in ultra low bitrate. My setting for Xvid devapi-3: MSP:6UH QT:h.263 VHQ:4 Max Internal:240 Chroma Motion BFC: 1/146/73 Quantizer restriction: 2/4/2/14 Quantizer matrix: matrix anime for low bitrate or fox home entermaint for higher Max flow overflow..: 5/5 Chroma optimizer / Trellis quantisation Sorry for my english and, thanks for your answers.

22nd May 2004, 18:48	#2 \| Link
Teegedeck Moderator, Ex(viD)-Mascot Join Date: Oct 2001 Posts: 2,564	You're right; it isn't recommended. Those quantizer limitations of yours are contradictory to encoding at low bitrates. You're better advised to encode your first pass at quant=3 and perhaps use that same quant as minimum quant for second pass. But don't set maximum quants. __________________ It's a man's life in Doom9's 52nd MPEG division. "The cat sat on the mat." ATM I'm thoroughly enjoying the Banshee - a fantastic music player/ripper for Linux. Give it a whirl!

22nd May 2004, 23:16	#4 \| Link
bond Moderator Join Date: Nov 2001 Posts: 9,780	and as xvid does not preprocessing itself its propably a good idea to use some avisynth filtering __________________ Between the weak and the strong one it is the freedom which oppresses and the law that liberates (Jean Jacques Rousseau) I know, that I know nothing (Socrates) MPEG-4 ASP FAQ \| AVC/H.264 FAQ \| AAC FAQ \| MP4 FAQ \| MP4Menu stores DVD Menus in MP4 (guide) Ogg Theora \| Ogg Vorbis use WM9 today and get Micro$oft controlling the A/V market tomorrow for free

23rd May 2004, 22:04	#6 \| Link
Teegedeck Moderator, Ex(viD)-Mascot Join Date: Oct 2001 Posts: 2,564	I think the XviD team is always happy about such nice feedback. Please note that Koepi is one member of the team, but he is one among many (hard-working and gifted people, all of them!). Greets, Tee __________________ It's a man's life in Doom9's 52nd MPEG division. "The cat sat on the mat." ATM I'm thoroughly enjoying the Banshee - a fantastic music player/ripper for Linux. Give it a whirl!

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22nd May 2004, 20:20	#3 \| Link
guada Registered User Join Date: May 2004 Posts: 185	Thanks for your propositions. I'm going to try it. Note: I asked this question because at 7kbps avi and audio , Xvid test settings devapi-3 is better than RV10e, but lesser than VP6 and the leader h.264 A très bientôt - a little french would be welcome..

23rd May 2004, 21:49	#5 \| Link
guada Registered User Join Date: May 2004 Posts: 185	hello Teegedeck an Bond, I tested the Xvid codec according to your suggestions. I could notice an appreciable difference of visual aspect. later,i tried the last Xvid codec improved by koepi. In a word: FABULOUS Koepi, made a big work on the speed and touch chromatic (a few more sharper than the customary); Even if (only to myself), the devapi-3 Xvid codec stay the must (Xvidement parlant) for treatment on ultra low bitrate. In fact, that guaranted the respect of the sharper and the natural aspect of the video. While waiting for the visit of JM ROTA in the next months, the Xvid final is going well; To be continued... If I tell nonsense don't hesitate to correct myself. I just wonder if a codec which makes a real work in HDV reproduction, can also be revealed an excellent tools of video compression for low bitrate.