[bits/(pixel*frame) ] ratio

[denissio]

Greetings!
A small question about XVID:
What is the optimal [Bits/(Pixel*Frame)] ratio for this codec?
I need it to set the correct resolution for my dvd-rips.
Afaik, a good ratio for DX50 is 0.28-0.20. Keepeing this in mind, I often undersized my rips (esp. 1-CD encodings) and eventually I decided to try XVID and found out that with the ratio 0.17 it performed better than DX50 with 0.20 (maybe for one specific movie :))
So what's the minimum for XVID? Let's assume the movie has _average_ compressibility, amount of motion etc.

P.S. I usually use denoising as follows:

Temporalsoften(2,3,3,mode=2,scenechange=6)
mergechroma(blur(1.3))
FluxSmooth(5,7)

or

Temporalsoften(3,5,5,mode=2,scenechange=10)
Convolution3d("moviehq")
FluxSmooth(7,7)

[Leo 69]

To my mind, it doesn't mean anything.
It may be 0.070 or so and still the quality may be awesome, depending
on what filtering you're making ;)

[Leo 69]

Check out the clip from my 1Cd encode, the ratio in this film was about 0.080 but still it is ALMOST DVD quality.The bitrate is about 550kbit\s but I recommend to switch OFF all postprocessing to watch this at its best :)

http://cp.people.overclockers.ru/cgi-bin/dl.pl?id=4249&filename=test.rar

The encode was made with Koepi's build 1.1 from 06112004

[Mnl]

Hi denissio

Try using search ;) - actually just try searching for the exact title of your thread. I did, and this thread turned up among some af the first on the list:

http://forum.doom9.org/showthread.php?s=&threadid=61187&highlight=bits%2Fpixel%2Aframe+ratio

This thread should give you some of the information you want. (For example that it doesn't make any sense at all to talk of an optimal [Bits/(Pixel*Frame)] ratio for any codec, and that you should use a compressibility test instead.)

[SeeMoreDigital]

Originally posted by Leo 69
Check out the clip from my 1Cd encode, the ratio in this film was about 0.080 but still it is ALMOST DVD quality.The bitrate is about 550kbit\s but I recommend to switch OFF all postprocessing to watch this at its best :)

http://cp.people.overclockers.ru/cgi-bin/dl.pl?id=4249&filename=test.rar

The encode was made with Koepi's build 1.1 from 06112004 I hope you don't mind me saying, but it looks like the aspect ratio of your encode is incorrect!

Your encode has a pixel frame size of 720x336, which equates to an aspect ratio (AR) of 2.14:1. Surely a pixel frame of 720x304, would have been nearer the mark. And would have increased your encodes Qf - If you're into that sort of thing!


Cheers

[Leo 69]

@ SeeMoreDigital

Thanks, mate. :) Actually I didn't even know about it...
Hmm.. Nowadays I do all encodes in Recode.Does the aspect ratio
play a big role in AVC too? You know,I always watch my videos on PC
so I need a wider picture in 16:9 films :D

Leo

[SeeMoreDigital]

Originally posted by Leo 69
@ SeeMoreDigital

Thanks, mate. :) Actually I didn't even know about it...
Hmm.. Nowadays I do all encodes in Recode.Does the aspect ratio
play a big role in AVC too? You know,I always watch my videos on PC
so I need a wider picture in 16:9 films :D

Leo Knowing the correct aspect ratio of the source is always very important, especially when generating cropped (and re-sized) encodes with square pixels!


Cheers