Digital Video Forums  

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

 
 
LinkBack Thread Tools Search this Thread Rate Thread Display Modes
Old 7 Sep 2008, 06:49 PM   #1
Junior Member
Junior Member
 
Join Date: Sep 2008
Posts: 11
Default Music Video Conversion

This is, in a funny way - something I can't find anywhere help with.
I'm a user of virtualdub for several years now, but my main conversion files are Music Videos, rather than full length files (1 hr / 1:30 hrs).
What I want to know is whether there are specific guidelines to convert Music Videos to DivX/Xvid, and receive the best quality possible, for files that are originally 50 mb or so, into about 25 mb ...
I am trying all sorts of settings, but mostly the picture comes up pixelated. I admit I don't have expert knowledge of the divx codec, but there must be a way to reduce the amount of pixelization...
I used several bitrate calculators, that said I need to put a value of about 503 for that video, but that didn't help.
Any help would be appreciated, as I have several GB's of music videos I want to reduce...
Thank you.
Attached Thumbnails
Music Video Conversion-snapshot.jpg  
dominus is offline  
Old 7 Sep 2008, 08:12 PM   #2
Lord of Digital Video
Lord of Digital Video
 
paglamon's Avatar
 
Join Date: Aug 2005
Location: 22░38'12.55" N, 88░25'20.87" E
Posts: 2,126
Default

What format are the original videos in ? What are the bitrates of the originals ? Please use Mediainfo to provide relevant information about the original files.
__________________

ONLY MOMENTS LINGER...DEWDROPS ON A FALLEN LEAF
paglamon is offline  
Old 7 Sep 2008, 10:29 PM   #3
Junior Member
Junior Member
 
Join Date: Sep 2008
Posts: 11
Default

Nice. I wasn't aware of the existence of media info, I'm using G-spot.
Anyhow, most of the files are mpeg files, with different bitrates.
Let's take the file I attached for example, it's an mpeg (MPEG-PS) with a bitrate of 1,071 Kbps video stream, and a resolution of 352x240 , 29.97 fps and 4:3 aspect ratio.
Enough info?
dominus is offline  
Old 8 Sep 2008, 04:46 AM   #4
Lord of Digital Video
Lord of Digital Video
 
paglamon's Avatar
 
Join Date: Aug 2005
Location: 22░38'12.55" N, 88░25'20.87" E
Posts: 2,126
Default

Quote:
it's an mpeg (MPEG-PS) with a bitrate of 1,071 Kbps video stream
VCD quality is 1150 kbps. Your mpeg has even less bitrate. So the source video is already pretty compressed and not of too good a quality. Compressing it further will surely have its untoward effects(like pixelation). For a low bitrate(as 503 kbps) you MUST do a 2-pass encode. Also,if the original video has any black borders, you should crop them before encoding. And see if you can squeeze out some more bitrate from the audio.

And lastly,at low resolutions(like 352 x 240) pictures will have pixelations on a computer full-screen. Should look somewhat better on your TV.

Some help with XviD configuration in Virtualdub:http://www.doom9.org/xvid-vdub-final.htm

Last edited by paglamon; 8 Sep 2008 at 04:50 AM
paglamon is offline  
Old 8 Sep 2008, 01:28 PM   #5
Junior Member
Junior Member
 
Join Date: Sep 2008
Posts: 11
Default Mpeg conversion

Hey,
Thanks for the reply.
When I used media info on the file it actually said
Bit rate : 1 071 Kbps
Nominal bit rate : 1 150 Kbps

Does this mean it isn't vcd quality?
I actually tried Spamsoft's video converter on the file and it didn't come out pixelated... it just came out bigger.... <g>
The double pass I never tried, perhaps that is my problem. I shall try it and report back.
Thanks for the answers.

Last edited by dominus; 8 Sep 2008 at 03:50 PM
dominus is offline  
Old 8 Sep 2008, 09:02 PM   #6
Junior Member
Junior Member
 
Join Date: Sep 2008
Posts: 11
Default

Nope. No help there, 2nd pass didn't help.
The Xvid tutorial you referred me to had Gordian Knot prefix instructions I couldn't find, and referred to a dvd rip / 700 mb files... Which is exactly my problem - nowhere can I find small files conversion tutorials....
Any other ideas ?
dominus is offline  
Old 8 Sep 2008, 11:25 PM   #7
Lord of Digital Video
Lord of Digital Video
 
paglamon's Avatar
 
Join Date: Aug 2005
Location: 22░38'12.55" N, 88░25'20.87" E
Posts: 2,126
Default

Sorry. At 503 kbps bitrate, you will never get a satisfactory Xvid/DivX avi. You can just try to get the best out of it by going for VBR and 2-pass. How does your avi look on TV ?
paglamon is offline  
Old 9 Sep 2008, 02:10 AM   #8
Lord of Digital Video
Lord of Digital Video
 
Join Date: Dec 2005
Posts: 1,500
Lightbulb

Hi dominus,

If your SOURCE is low quality ... you can only do so much ... may be if you use FILTERS in VDub you can get it a little cleaned up but not much!

G!
gonwk is offline  
Old 9 Sep 2008, 03:25 PM   #9
Junior Member
Junior Member
 
Join Date: Sep 2008
Posts: 11
Default

actually the source isn't very low quality.
I mean, it's not s-vcd quality but it doesn't have the pixelization before I convert it.
But my question is generally for all of my 206 music videos, some of which are better quality and some of which are less.
Paglamon - The vbr/2-pass would mean that I set the audio to vbr, right? How does the audio affect the video conversion? And what would you suggest I set the bitrate to if not to 503?
dominus is offline  
Old 9 Sep 2008, 05:20 PM   #10
Lord of Digital Video
Lord of Digital Video
 
paglamon's Avatar
 
Join Date: Aug 2005
Location: 22░38'12.55" N, 88░25'20.87" E
Posts: 2,126
Default

VBR for video,not audio.In any case,2-pass, IIRC, will automatically choose VBR. If you want the size to be about half the original, obviously the bitrate you can set is also about half the original. So,if you increase the video bitrate the size of file increases.The only other option is to decrease the audio bitrate and increase the video bitrate to keep the target file size same. Now those 1-CD encoding of a standard sized movie(this is the lowest quality acceptable to most) usually keeps the video bitrate at around 800kbps.Which means that the total bitrate(vid+aud) will be about 900+ kbps. That is why reencoding a vcd quality(1150kbps video)video will not be of much help since you are not saving too much bitrate. Try encoding small clips(1 min) of the original video at different bitrates and decide the minimum rate at which you get rid of the pixelation.
paglamon is offline  
Old 9 Sep 2008, 06:09 PM   #11
Junior Member
Junior Member
 
Join Date: Sep 2008
Posts: 11
Default

I feel like I'm struggling against windmills here... I took another file for reference and the pixelization continues.
I even tried 1100 bitrate setting for comparison, and it continues... is it a codec thing? I mean, if I try with Xvid should it better? And the Xvid codec has it's own settings... Arrgg....
dominus is offline  
Old 9 Sep 2008, 09:52 PM   #12
Lord of Digital Video
Lord of Digital Video
 
paglamon's Avatar
 
Join Date: Aug 2005
Location: 22░38'12.55" N, 88░25'20.87" E
Posts: 2,126
Default

Quote:
I took another file for reference and the pixelization continues.
This is the third time I ask the question : How does the encoded file look on TV ?
paglamon is offline  
Old 9 Sep 2008, 11:27 PM   #13
Junior Member
Junior Member
 
Join Date: Sep 2008
Posts: 11
Default

Sorry, I haven't answered this question because I haven't tried it on a tv. I didn't have access to one with the divx... but I'll try it later.
dominus is offline  
Old 10 Sep 2008, 01:28 AM   #14
Lord of Digital Video
Lord of Digital Video
 
paglamon's Avatar
 
Join Date: Aug 2005
Location: 22░38'12.55" N, 88░25'20.87" E
Posts: 2,126
Default

Can you possibly upload a very small(say about 10 MB) sample of the original video and let me see what I can make out of it with XviD/DivX ? Here is a free site for uploading.
paglamon is offline  
Old 11 Sep 2008, 06:44 PM   #15
Junior Member
Junior Member
 
Join Date: Sep 2008
Posts: 11
Default

Okay, took me about a day to find and test a good video splitter (used ezsplitter eventually) that won't change the bitrate/ratio/anything else in the split file.
This is another file, rather than the first one I wrote to you about.
It's original size is 40.2 mb, and as with the rest of my to-b-converted files, I'd be content with up to 75% of it's size after conversion...
<a href='http://www.sendspace.com/file/8uord0'>http://www.sendspace.com/file/8uord0</a>
THanks.
dominus 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Video to Music? Travis355 AVI, DivX/Xvid 2 9 Mar 2006 04:31 PM
Song needs a video: Looking for a partner to create a music video britune General Discussions 1 23 May 2005 11:59 PM
Music video? Cornelius456 General Discussions 4 20 Apr 2003 06:51 AM
Music video? Cornelius456 Junior Members/Newbies 0 20 Dec 2001 09:06 AM



All times are GMT +10. The time now is 04:50 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