File Sizes on DivX conversions

[Stormblade]

Hey all,

Got a question for ya. I converted a Quicktime movie file to DivX 5.0.1. Now first thing I did was use TMPGEnc along with the Qt Plugin to convert it to mpg. I noticed that the file size was waay more than the original. Original was 13 megs and the mpg TMPGenc put out was 63 megs or so.

So I figure will once I get it in Virtual Dub and convert to DivX 5.0.1 it should be better....Nope that didn't happen. I never got it anywhere close to the 13 megs of the original. Is it my settings?

Just now I tried converting a .asf file to DivX using Virtual Dub 1.4 with asf support. It went from a 2 meg .asf file to a 7 meg DivX file.

What should I do? I'm still a newbie but I'm getting better. Do I need to play around with the bitrate? Maybe get that bitrate calculator I keep hearing about? Will this help me with getting the filesize down while keeping the quality at least as good as the original or so close its not noticeable?

[techno]

this is normal.

MPEG, DIVX, QT have all different "methods" or "properties" or "rules". U cannot expect to reduce the file size from xMB to yMB.

use nandub if u want, u can specify the final file size but be warned:

there will be quality loss.


but my method:

convert the file to MPEG2 using TMPGENC
load vidomi (www.vidomi.com)
load the MPEG2 video
use the fast motion codec
use thse settings:

75crisp
10 k/f
6000 bitrate
and encode

u should notice less file size and quality will be good. (depending on the source!)

Techno

[Stormblade]

Thanks for the reply.

I've never used Vidomi but I downloaded and installed it. I loaded up an AVI that I'd made from 3 .mov files in Premiere and all Vidomi did was crash repeatedly.

[techno]

do this:

TMPGENC:

QT mov > MPEG2.

then load this MPEG2 file in vidomi and encode.

if it still crashes, email me and i will send u the first nice release of vidomi since that version is more reliable

Techno

[Stormblade]

The mpg that TMPGEnc produced wouldn't even load in Vidomi. But that's ok. What I did was play around with the bitrate. The quality of that Quicktime movies wasn't all that great. I decreased the bitrate down to 200 and not much difference quality decrease. I may increase this slightly but the file size is 17 megs. Just a 4 meg increase over the original which is very acceptable.

And that's just the mpg. I will re-encode and see if it gets even smaller.