EDITING
GUIDES -> How to edit a finished DVD
At some point in
time, many find it necessary to edit or correct problems on
an already-existing DVD. This guide will show you how to
extract the video and audio files from the DVD, and then
re-author it to a new disc with new menus, maybe even shrink
it after combining several discs. This guides
requires DVD Decryptor and VOB Edit, both free tools.
There are many reasons a person would want to extract
content from a disc. Maybe the DVD is not full because the
bit-rates were too high? Maybe the audio was the wrong
format or needed restoration work? Maybe the edits were bad.
Or you simply wanted to grab some footage for another
project.
Decompile
the disc
Even if the disc is homemade, load it in DVD
Decrypter. Go into IFO MODE.
Notice the PGC list. These are you video files. You've
got to figure out on your own which PGC goes with which
item. In this example, PGC 1 is the movie (note the 1:39
time stamp) and the others are extras.
Go to Stream Processing. Enable the processing and
select the DEMUX option. Also you can choose what you want.
In this example, I chose to dump the non-English language
tracks and subtitles.
Files. After decrypting the PGC (PGC 2 was used in this
example), you'll find the files on your hard drive. You can
delete the IFO and TXT files, as they are not needed. What
you have left is the M2V video files and the VOB containing
the audio.
Extracting the audio. Close DVD Decryptor and open VOB
Edit. At the bottom right press the OPEN button and go open
the VOB file. A list of information will appear on the
left-half window. Next click the DEMUX button on the bottom
near the OPEN button.
In the window above that opens from pressing DEMUX, select
the audio type that you are extracting. This must be figured
out on your own, thought the left-half window information
normally says PCM Audio Pack or AC-3 Audio Pack in the audio
information. If there are multiple audio streams, then be
sure to tick the "demux all audio streams" option.
This program can also be used to extract video and audio
from VOB files already on your hard drive, though I prefer
the DVD Decrypter method as it is more accurate and can
detect seperate PGC within the same VOB automatically.
You now have your AUDIO and VIDEO files successfully
extracted on your hard drive and ready for further use.
Re-encode,
re-author, re-burn
This is where this guide ends. Now that you have
successfully extracted the video and audio files, you can
re-encode as wanted, or even just re-author and then
re-burn.
Shrink trick. This method is also useful for
compressing several discs onto one disc.
Example: There were three old discs that had PCM audio, were
only 3GB in size, and the video files were cartoons with 9.8
CBR MPEG-2 bit-rates. It was complete overkill and a waste
of space. I took the audio and re-encoded to AC3 with
Besweet. I then made new menus (which actually looked better
than the ones on the source discs) and authored a project to
the hard drive that was about 7GB in size. I then used DVD
Shrink 3 Beta 5 in Deep Analysis mode and shrunk the 7GB
folder to a 4.38GB suitable for burning. The final product
looked as perfect as the original, but at 1/3rd the original
size in terms of discs. Excessively long re-encodes were not
needed. This is not always going to lead to high quality,
but in this example, it did.
Page Last Updated: May 8th 2005
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