Xvid Compression Questions

[MaggIvy]

Hi, well i have a question. I am trying to compress a 4 minute video using Xvid two pass mode. On the first pass, it comes out as 84 MB. I think that is a bit big for a 4 minute video, though i have read somewhere that a video should be 20 MB per minute, if true then my video should be fine right? Also, when i try second pass, it blows up to over 200 MB.

I have read the following tuts, and etc...

1 (http://forum.doom9.org/showthread.php?t=16935)
2
(http://forum.doom9.org/showthread.php?t=92046)3 (http://www.animemusicvideos.org/guides/avtech/xvid.html)

I have tried using the old xvid, the new xvid, everything and nothing works. I have heard from #3 that if your first pass on vdub is a good size that you shouldn't have to do it over again. Is this true?

Heck, even single pass, when using the calculator fails to work or bring down the file size to what i consider is a good size. Anyone have any ideas? :confused:

[CWR03]

It's hard to know how well your video will compress without knowing more details about it (Framerate, resolution, amount of motion, whether or not it's interlaced and if you're trying to keep it interlaced). If you're using a 2-pass method, your target size should be met unless you've done something wrong. You might start by uninstalling Xvid completely, searching for the xvid.ax and xvid.dll files and deleting them and reinstalling XviD. Installing a version over another is a common cause of filesize problems.

You might even consider using AutoGK.

[MaggIvy]

(Framerate, resolution, amount of motion, whether or not it's interlaced and if you're trying to keep it interlaced). If you're using a 2-pass method, your target size should be met unless you've done something wrong. You might start by uninstalling Xvid completely, searching for the xvid.ax and xvid.dll files and deleting them and reinstalling XviD. Installing a version over another is a common cause of filesize problems.

You might even consider using AutoGK.

Framerate: 23.976
Resolution: 640 by 360
Amount of Motion: A LOT
Interlaced: No

I have tried doing it in quantinization mode at 4 i got a good size but it was very pixellated...I think I'll try that and autogk.

What is the newest version of Xvid?

[jon.schaffer]

The most important question is: What is your target file size?
(If you have a doubt about your installation, click on "load defaults", if there were an error somewhere, it should fix it.)

What is the newest version of Xvid?
It is irrelevant here. The newest versions are not better in order to cope with possible size prediction problems. But you can try here:
http://esby.free.fr/CelticDruid/mirror/XviD/

[MaggIvy]

The most important question is: What is your target file size?
(If you have a doubt about your installation, click on "load defaults", if there were an error somewhere, it should fix it.)


It is irrelevant here. The newest versions are not better in order to cope with possible size prediction problems. But you can try here:
http://esby.free.fr/CelticDruid/mirror/XviD/

Thank you. My target file size is 50MB. I will try and load defaults and reinstall xvid to see what happens.

Umm, which one do i download?

[foxyshadis]

The top one is the most current, but may be unstable, the 1.1.0 is the last stable version.

[MaggIvy]

The top one is the most current, but may be unstable, the 1.1.0 is the last stable version.

What are the bugs and whatnot thats wrong with it?

[Your_Idol]

Unless you need to limit the file size for some reason i would suggest you go for good quality by using single pass with quantizer of 3 no mater what the file size. For "Amount of Motion: A LOT" 80mb sounds fine.

[MaggIvy]

Ok thank you. I will try it.

Well, i've tried it and i got a lot of ugly pixellation...I guess bigger might be better...

[MaggIvy]

You might start by uninstalling Xvid completely, searching for the xvid.ax and xvid.dll files and deleting them and reinstalling XviD. Installing a version over another is a common cause of filesize problems.

Ok, i have found out that i have had, 3 xvid installs over top of each other. I have deleted everything that you have pointed out and re installed with the new xvid. Tried compressing all over again, and, nothing has changed. Same old crap...I really don't know what to do anymore then to leave it at 80MB.

I'm reformatting my puter soon so i hope that it fixes itself...:logfile:

[CWR03]

Try installing the latest stable XviD (version 1.1.0), then uninstall and reinstall it again. Regardless of prior installs, that should clear up any problems.

[foxyshadis]

If you've hit load defaults, then the problem is simple: You have audio involved in the chain somewhere. Load your first pass avi in and look at vdub's info, the video should be 1 kbps and the audio something like 1411 kbps or 1536 kbps. The fix is that before starting compression, you either turn audio off, and compress & mux it separately, or you make sure to use a codec on it. First pass should be in the ~1meg range, or less, not 80 megs (unless full first pass is checked).

[MaggIvy]

The fix is that before starting compression, you either turn audio off, and compress & mux it separately, or you make sure to use a codec on it. First pass should be in the ~1meg range, or less, not 80 megs (unless full first pass is checked).

Ohh ok, so what i do is, first pass without audio or select no audio and then with second pass put the audio back on? And yep, full first pass is checked.

[foxyshadis]

Save the audio from virtualdub, and encode it with, say, belight. Then mux it back in with the final encoded file. In the meantime, choose no audio during the video compression.

[Blue_MiSfit]

I've done that so many times. Amazing how much a fat 1.5 mbit PCM WAV can blow up the file size of an AVI :)

[MaggIvy]

Save the audio from virtualdub, and encode it with, say, belight. Then mux it back in with the final encoded file. In the meantime, choose no audio during the video compression.

Thanks, I hope this works.