Large file size, not compressing right (?)

mercythrill · Post by **mercythrill** » Fri Jan 18, 2008 8:23 am

I'll try to explain what's going on, and maybe you can shed some light, because I'm stumped.

I have an uncompressed avi exported from Premiere. It's big, about 4G. So I'm using the guide to compress it with xvid. (This one: http://www.animemusicvideos.org/guides/ ... /xvid.html)

The full-quality first pass is 86Mb. The total frame size in the bottom right hand corner of the "Xvid Status" window says 47,000 frames.

According to the guide, I should be able to aim for ~70% of that 47k. Yet, when I punch in a filesize of 32k for the second pass, I get a resulting file size of 79Mb.

That's not much of a difference. Heh. Anyway, I think you see the problem I'm having.

I am staying with the original source (I'm not loading up my first pass or anything), and I've played around with fast recompress vs full processing, but nothing seems to help.

Can anyone shed some light for me? Thanks in advance.

mercythrill · Post by **mercythrill** » Fri Jan 18, 2008 11:00 am

Hmm. The compression seems to be working okay in VirtualDub. (It's just VirtualDubMod that's having problems). If anyone has any ideas as to what's causing this weird little quirk, feel free to throw them out. In the meantime, I guess I'll be using VirtualDub for post-processing of AVI's.

Thankfully, VirtualDub doesn't seem to be all that much different, so yay for that?

BasharOfTheAges · Post by **BasharOfTheAges** » Fri Jan 18, 2008 12:04 pm

Are you compressing your audio? That'll save a whole lot of space.

mercythrill · Post by **mercythrill** » Fri Jan 18, 2008 12:16 pm

Ooh. That makes sense.

And it explains the difference between VirtualDub and VirtualDubMod. (I had imported a wave file into VirtualDub to make it mono for uploading online, whereas with VDubMod, I just said, meh, it's good.)

It never even occurred to me that it would be that big of a difference. Thank you!

BasharOfTheAges · Post by **BasharOfTheAges** » Fri Jan 18, 2008 12:33 pm

Yea, a 30MB WAV file will easily turn into a 5MB MP3.

kenzuka · Post by **kenzuka** » Fri Jan 18, 2008 1:17 pm

dreamcatcherr wrote:Ooh. That makes sense.

And it explains the difference between VirtualDub and VirtualDubMod. (I had imported a wave file into VirtualDub to make it mono for uploading online, whereas with VDubMod, I just said, meh, it's good.)

It never even occurred to me that it would be that big of a difference. Thank you!

You can compress audio with vdubmod, just like vdub. When you check the track listing with the tab Track, to the right of the tab Video(sorry if the specific terms are wrong, but I have the french version), you do a right click on your audio track and click on full-processing mode, and after that, just like vdub, you choose your type of compression again by a right-click on the audio track.

mercythrill · Post by **mercythrill** » Fri Jan 18, 2008 3:54 pm

That's fantastic to hear. Thank you. I was always curious why it apparently had no audio compression. Turns out, it does!

Kariudo · Post by **Kariudo** » Sat Jan 19, 2008 1:50 am

if you are feeling a bit adventurous, you could try compressing with x.264 (and audio to LC-AAC).

meGUIor Zarx264GUI can do that (second one is pretty much point-click-encode AFAIK)

I've managed to get .mp4 encodes roughly half the size of their xvid (.avi) counterparts (who knows, maybe I just suck at xvid encodes.)

mercythrill · Post by **mercythrill** » Sat Jan 19, 2008 2:50 pm

Not feeling so adventurous at the moment.

I'm still fretting over my aspect ratio.

I came into this site through the backway, so I'm trying to fix a video I had already started.

Not good.

I went back and resized/cropped the initial DVD rip to 720X480, which should make the pixel ratio = 1 (?), but I'm working in a Premiere project with a 0.9 pixel ratio (which I can't change.)

I'm hoping that simply exporting the video at a 1.0 pixel ratio should leave me back where I started. So, yeah. If xvid works, then I'm grabbing onto it as one piece of solid knowledge I have while I wrestle with this other stuff.

But thanks for the suggestion. (Maybe when I'm more grown-up.)

BasharOfTheAges · Post by **BasharOfTheAges** » Sat Jan 19, 2008 3:29 pm

Aspect Ratio and PAR are 2 different things that aren't dependent on one another. NTSC DVDs are usually encoded 720x480 with a 0.9PAR. After exporting from premiere you can resize for proper TV viewing (same as the DVD) and a 1.0PAR online distro format.