Digital Video Forums  

Go Back   Digital Video Forums > Other > Archive (Closed) > Other Software

 
 
LinkBack Thread Tools Search this Thread Rate Thread Display Modes
Old 27 Jul 2005, 09:38 AM   #1
Junior Member
Junior Member
 
Join Date: Jul 2005
Posts: 4
Default Virtualdub makes my mpegs BIGGER??

Gentlemen,

Please forgive a COMPLETE noob here, but I'm having a BIG problem compressing video with Virtualdub.

I import the video from my camera as MPEG-1.

I open the video in Virtualdub and try to convert it to an AVI and compress it. I have tried using several of the codecs that are shown in Virtualdub, I have tried to alter the framerate and I have even selected "no audio". No matter what I do, Virtualdub turns my 10mb MPEG-1 into an AVI of about 48mb!!

I'm sure there is something simple that I'm missing here and I'm sure one of you experts can clue me in in about 30 seconds. I tried searching the forums first, but to no avail.

Please help.

Thanks

SSB
singleshotbuff is offline  
Old 27 Jul 2005, 10:12 AM   #2
Demigod of Digital Video
 
LT. Columbo's Avatar
 
Join Date: Nov 2004
Location: Los Angeles, CA
Posts: 10,671
Default

what are your compression settings for the video?
__________________
"One day men will look back and say I gave birth to the 20th Century". Jack The Ripper - 1888
Columbo moments...
"Double Shock" "The Greenhouse Jungle" "Swan Song" FORUM RULES
"You try to contrive a perfect alibi, and it's your perfect alibi that's gonna hang ya."
(An Exercise In Fatality, 1974)


LT. Columbo is offline  
Old 27 Jul 2005, 10:28 AM   #3
Junior Member
Junior Member
 
Join Date: Jul 2005
Posts: 4
Default

Columbo,

I'm not 100% sure, I know I changed the framerate down to 24(?) fps, and I think I turned the quality down from 100 to 75. What else should I adjust and how? Sorry if I sound dumb, I'm just trying to learn this.

SSB
singleshotbuff is offline  
Old 27 Jul 2005, 11:22 AM   #4
Lord of Digital Video
Lord of Digital Video
 
tigerman8u's Avatar
 
Join Date: Aug 2003
Posts: 2,123
Default

lowering the fps won't make the file smaller. video bitrate and audio k/bps will lower the file size. I use 124k/bps cbr 16 bit stereo for audio. for mpeg 1 resolution (352x240/288) you should be able to use 700-800k/bps and get good results.
tigerman8u is offline  
Old 27 Jul 2005, 01:25 PM   #5
Junior Member
Junior Member
 
Join Date: Jul 2005
Posts: 4
Default

Gentlemen,

Thanks for the help, it got me started in the right direction. Here's what I have accomplished so far.

I switched to DiVx 4.1 codec.

I wound up (through trial and error) with 38-39 KBPS.

These changes have allowed me to shrink a 10mb MPEG-1 down to 2.3MB with acceptable quality.

Next I recaptured the video as a higher quality avi and wound up with a 181MB file that I was able to compress with these setting down to 1.8MB, still with acceptable quality.

This has led to another issue/question, if I may.

While the quality is still decent, the video is fast. Sort of like fast forward on the camcorder. The original 181MB clip is 1.01 min in duration while the compressed clip is only 0.49 min in duration. What have I done and how do I slow it down while retaining the quality I have achieved?

Thanks in advance for any help.

SSB
singleshotbuff is offline  
Old 27 Jul 2005, 04:14 PM   #6
Lord of Digital Video
Lord of Digital Video
 
tigerman8u's Avatar
 
Join Date: Aug 2003
Posts: 2,123
Default

"the video is fast. Sort of like fast forward on the camcorder"

sounds like you changed the fps on the video. load the original in virtualdub and click file>file information and check the length and fps of the video. do the same for compressed file. If you speed up the fps you can get the fast forward effect because the video is running faster. the fps can be changed but it has to be done properly.
tigerman8u is offline  
 

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off




All times are GMT +10. The time now is 03:14 PM.

Kirsch designed by Andrew & Austin


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright © 1999 - 2018 Digital Digest

Visit DivXLand   Visit dvdloc8.com