virtual dub: HUGE undersize

[apjorz]

Hi all!

I just ran into a big problem with VirtualDub 1.4.7. Following Doom9's guides (kickass guides and site, btw... the best, but enough of this:)), I created a DVD2AVI project file, converted it by the VFAPI reader, and loaded it into Virtual Dub. It's the film Chocolat, so it's around 1h57min, and I used several bitrate calculators to get a target bitrate. This happens to be 2300 (but I've tried other values as well). So after applying the resize filter (precise bilinear, to 640x352) and setting the target bitrate in Divx4.12), I started to encode it. When it was done, I ended up with a file almost half as big as I wanted it to be. (I wanted the rip to fit on 3x700 mb with sound, just to know how it looks), so I wanted a file about 1900 mb (w ac3 sound), and the final no-sound avi was about only 1,1G or so. The quality is something you expect from 2 cds and not three:)), it's similar to the 2cd-dominion rip. I did this 3 times, no significant change. If you do 2300*117*60/8, you get a file slightly over 2 Gigs. So how come Vdub's output file is so small? Any ideas?



note1: the same process worked fine for some rips I did before.
note2: sorry if this was discussed before, I couldn't read all the topics:))
note3: I almost forgot: 2-pass mode, as described in Doom9's guide
note3: me no speak english... sorry if unintelligible :>

[apjorz]

Yes, I'm aware of VirtualDub 1.4.8 and I'm actually downloading it, but as it isn't a listed bug, I don't expect it to be fixed... :confused:

[Acaila]

Well, it's known that DivX4 creates undersized files.

To compensate this you could increase your resolution from 640 to 720 and instead of using Bilinear Resizing (which is way too blurry for my taste) you should you Sharp Bicubic.

[apjorz]

Thanks for your fast reply :)

As for Divx4: undersized - yes, I saw a topic discussing a 40 MB / cd undersizing. But 1100 mb out of 1900 mb, it's something different, isn't it? If it's just divx4 and nothing else can be done, then I'll keep tweaking until I get something better. Thanks again for replying. I have also planned to increase the resolution.

btw: Which bicubic method is 'sharp'? (A=??)

And a final question. I believe that divx4log would help me (by analysing the file and thus giving me a more correct size estimation etc), but as I'm rather new in the 'buisiness' :>, I don't really know if it's worth trying. So a special question goes to divx4log users: would this prog help me out? If so, do I need to know anything beside everwicked's guide?

Thanx!

[Manao]

You've found a movie that compress very well. Follow the advice of Acaila if you really want to augment the size of your movie ( BTW sharp bicubic is 0.75 ), and if you still don't reach the 1,900 Meg, you should try SBC DivX3 ( with GKnot ) or Xvid ( take a look at alternative codec forum ), they keep more details than DivX4. Xvid is easier than divX3, and seems already to beat divX4, even with div4log.

[apjorz]

Thank you, you've been very helpful!

I'll take a look at these alternate methods.

As I already possess the film, the 3cd-rip is just something I wanted to do to earn some more experience in ripping. Even by posting here I got many answers and hints, so I can call this a successful project :). So I'll stop wasting your time and get to work :D.

Thanks again!

[Acaila]

No offense, but creating a 3-CD rip is a piece of cake. You won't get real experience until you've tried to get a high quality 1-CD rip out of a movie.

[UHT]

unless the film is like plenty more than three hours then 3cds divx4 seems quite excessive, just make it for 2 cds thatll solve ur problem

[apjorz]

Originally posted by Acaila
No offense, but creating a 3-CD rip is a piece of cake. You won't get real experience until you've tried to get a high quality 1-CD rip out of a movie.

UR right here, I just wanted to know how far I could get in quality... as I said, it's just some tweaking :)