file size again

**khp** · 4 Jan 2002, 07:23 AM

what I was wondering now is how can I make it so the film fits the cd? if I have 700mb and Im only using 530 what would I have to do to work out how to get it to fill the disk?...

The old divx3.11 codec is generally not very good at file size prediction (especially the hi motion one).

Better filesize prediction can be achived with 4.12 in two pass mode.

**stoo** · 4 Jan 2002, 09:12 AM

thanks for that Ill be checking that out tomorrow......

**Nickmavros** · 4 Jan 2002, 09:20 AM

Look divx 3.11 was the codec everyone used to have.
It has two features low motion and fast motion.
Low motion was the better one with movies without much action and fast was the best for action movies.
If you did a movie in 2 cds and use low motion you could get a nice picture quality.In one cd not a very good one.
And then came the....
Divx 4.xx (latest version 4.12)
Much much much better quality.
But there is a price you have to pay : it takes double time.
I cannot tell you how to use the new codec (It would take many posts!!!).
There are guides you can find.
I believe everyone now is using the new codec.
To predict the size of the output avi you need a good calculator and a lot of luck.
Don't think that everyone can make his movie exactly 700 mb!!!
You have to practise!!!

**stoo** · 5 Jan 2002, 04:34 AM

thanks for the help but I feel a bit confused?... I never had divx 3 and I down loaded divx 4.12.
after reading nickys giudes I down loaded flask and followed the giude. in flask when I go to the video tab to chose which codec it has listed divx 4.12
divx lomo mpeg4
divx himo mpeg4

as for pic quilty I was stunned. untill Id done my own divx ripp the only examples Id seen where crap. the rip which Ive done is extremly good qulity wise in comparason to what ive seen.....

dont get me wrong Im not suggesting its me whos good, Im really satisfyed with what Ive made up to now. that might be becuse Id only seen crap befor thow......

thanks
stewart

**cg24** · 6 Jan 2002, 05:43 PM

I don't think there's any way to determine the exact size of your divx file. It's just too hard because the final file size depends on:

Your video encoding parameters (are you using 1 pass or 2 pass? what's your min/max quantizer? what's your video bitrate? etc),

Your audio encoding parameters (are you encoding ac3? are you using mp3? what mp3 bitrate?),

Your film size (are you cutting out the black margins in widescreen mode? are you resizing the film?)

Your film itself (action movies are more complex than talking movies)

I think the last item really makes it hard to tell how big your final Divx file will be.

**NIkboss** · 30 Jan 2002, 12:50 AM

Originally posted by khp

The old divx3.11 codec is generally not very good at file size prediction (especially the hi motion one).

Better filesize prediction can be achived with 4.12 in two pass mode.

HOW????

**techno** · 30 Jan 2002, 05:04 AM

No no no no no,

It is predictable, the file size, in DIVX 3.11alpha using low motion, use a bitrate calc!

DIVX 4 picture quality is good but file size is not as good. DIVX is supposed to be reducing the file size alot and maintaining high quality!!!!!!!

Low motion works well on high action scenes if the CORRECT bitrate is used.

Fast motion is good even in low motion scenes if the original source is good and does not product any artifacts.

You should be happy with the film fitting < 700MB!!!! Cause many films are not as less in size as u have mentioned with ghostbusters(?)

Stick with the original, DIVX 3.11alpha.

Techno

**khp** · 30 Jan 2002, 08:17 AM

I refuse to comment on any of techno statements, other than noteing that divx3.11 fastmotion simply can't encode lowgradient surfaces (nomatter how high the quality is) without serious bloking in lowmotion scenes.

But you should read my first post in ths thread http://forum.digital-digest.com/show...&threadid=2736

And the codec comparingson at doom9

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http://www.doom9.org/codecs.htm

**techno** · 30 Jan 2002, 08:19 AM

that's completly up to you. U ever tried experimenting? I am only giving my input from My experience, I didn't just say "fast motion" I also said "Low motion"

Techno

**khp** · 30 Jan 2002, 09:07 AM

U ever tried experimenting?

Yes I have done side by side comparisons, much like doom9's testing metohods, of approx 5 different movies, have you ?

**techno** · 30 Jan 2002, 07:18 PM

Yes I have experimented, otherwise I wouldn't have said any of these things!

I have captured different music video, encoded them to MPEG2 to produce high quality, then to DIVX fast motion and low motion, fast motion (for some reason) seems brilliant, no artifacts, no macroblocks

Even movies.

Techno

**khp** · 31 Jan 2002, 09:42 AM

I have captured different music video, encoded them to MPEG2 to produce high quality, then to DIVX fast motion and low motion, fast motion (for some reason) seems brilliant, no artifacts, no macroblocks

Arhhh... so you are talking about TV captures, there's a world of difference between encodeing DVD's rips and TV captures.
TV capture contain massive amounts of noise compared to almost any DVD rip. This makes the complexity go sky high, which means that the fastmotion codec has more room to work.

The divx4.xx codec is in its standard configuration optimized for DVD rip's. Try to raise the min quantizer to 4 or 5 (divx3.11 uses 5 belive) and the max quantizer to 18 then use that for two pass encoding.

**techno** · 31 Jan 2002, 11:13 PM

Yes KHP but the properties/principle of applying the codec to any source should be the same.

If it's Really high quality, I always use fast motion cause then it has more work to do and will work good on low motion scenes.

Techno

**khp** · 1 Feb 2002, 05:50 AM

Yes KHP but the properties/principle of applying the codec to any source should be the same.

Yes it would be nice if things could be simpified that much, unfortunatly that is not possible.

Much like the divx4.x codec doesn't work very well with TV captures (in standard configuration), the divx 3.11 fast motion can completly *uck up a DVD rip (filesize will often be less than 450MB (video only) for a 1:40 movie, regardless of bitrate settings).

The major difference between divx4 and divx3 is that, divx4 has unlocked the quantizers and has inbuild 2-pass encoding.

I prefer the freedom the unlocked quantizers give me, and the inbuild 2-pass encoding means that I can use any encoding tool I want.

Lets face if this stuff was simple everyone would be dooing it

file size again

file size again

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