What is a good custom quant matrix that drops off fast?

[trbarry]

Xvid generates a quant for each frame in the range of 1-31. But for 1 pass CBR/ABR it seems some extremely difficult scenes may generate too many bits for a period of time even when the quant goes to 31. Imagine a scene with just high contrast moving random dots. I'd like to lose more detail there if possible.

It occurs to me that some custom quant matrices might be better at handling this than others because the quants at the outer edges of the matrix are higher and so the bit rate might drop faster as the frame quant increases.

Is that true? And can anybody recommend some good ones?

- Tom

[Koepi]

Hm, HVS Good matrix comes to my mind. There the quantisation is getting very stromg at relatively low quantisers (and so is the detail loss ;) ).

But it might be worth a try, Tom.

Cheers
Koepi

[trbarry]

Koepi -

Thanks. I'll try that one.

IIRC, Xvid used to have some problem where once you used a custom quant matrix it did not alway load the default ones correctly. That isn't still a problem these days is it? (if it ever really was)

- Tom

[Koepi]

I never had such issues since pre-0.9-builds anymore, so I assume it's safe %)

Best regards
Koepi

[Sharktooth]

Maybe you can try also EQM V3ULR.
I tested it on a similar source and i was pretty pleased with the result.

[trbarry]

Thanks guys. I tested over the weekend and while both helped EQM V3ULR especially seems to to the job.

- Tom