Re: asking xvid encoder setting

Picasso Pablo wrote:
>FirmanD wrote:
>
>Hi all,
>
>>anybody here have experience converting MJPEG to avi with Xvid?
>well... a bit... Only tried on movies from my digital camera :)

it's ok :)


>>Vdub 1.5.10 is the tool, with filters:
>>- smart deinterlace ,threshold : 10
>>- resize ,precise bicubic 0.75 : 640x480
>>- color equalizer (my mjpeg a li'l bit greenish) ,red 0 / green -9 / blue +9
>Well, you could give a try to a denoising filter (Gaussian etc.) if the problems occur on noisy input... just a sugestion

The trade-off of using denoising filter is speed.
 From 20fps (1st pass) it dropped to 8-9fps :(
Even with *cough*x264*cough* and no denoising filter, I get 10-11fps.
Still, i can't find xvid+filter picture quality comparable to 
x264+nofilter .

the filters i tried:
- smart smoother
- msu denoiser
- blur / blur more


>>Compression is 2 pass Xvid 1.0.3, default settings, bitrate 1000Kbps
>
>You could give a try to quantization setting, if the bitrate is something you don't concern compared to quality. With a bit of simplification, constant quantizer tries to give constant "quality" (in the sense of differences in colors, blurriness etc.), not caring about the bitrate - difficult scenes (e.g. noisy) will get more bits, easy scenes get less. I think this could be a solution for you.

with Target Quantizer, the speed drops too.
Yes we have the constant quality, but the bitrate can be very fluctuative,
filesize can be unpredictable.
In my case (as i have described it), i'd like to have 
a better and real average 1000Kbps xvid(2-pass) , not blocky 700-800Kbps.

My situation in comical way:
"Codec! i want 2-passes, 1000Kbps average"
"yes sir, 2-pases, ..hey it's noisy.. ok lemme set it to 800Kbps average"
*processing and resulting final avi*
"Hey waitaminute, why you give me blocky pic and lower it to 800kbps?"
"....."
(On the other day, with different raw material)
"Now codec, i want 2-passes, 1000Kbps average"
"yes sir, 2-pases, ..hey it's not noisy.. ok lemme set it to 3000Kbps average"
*processing and resulting final avi*
'Hey, what's with this big filesize? why you upped it to 3000kbps ?"
"...."




>>Somehow the codec seems to compress more when it sense the noise,
>>and the average bitrate reported is around 7xx-8xxkbps.
>Well, that's a question for the developers :)

Is it ok to ask about this in developer list?


>Good luck!