Ac3Dec is an excellent program for extracting AC3 audio and converting
it to PCM Audio. It can handle almost any Vob or AC3 file with ease. The
quality is not quite as good as GraphEdit, but perhaps that will be fixed
in future updates. As always the DVD Vob files need to be decrypted to
your hard disk or Ac3Dec will not be able to read them.
Put the Ac3Dec.exe file in a folder on your main hard drive (usually
C:) and start up Danni's GUI. Click on the AC3DEC button at the top (encircled
in red) to bring up the Ac3Dec page we see below us. There are lot of
little useful options in Ac3Dec but these are not necessary to explain
here. I will just concentrate on the important task of getting the audio
Press the (A) button and select the
location of the Ac3Dec.exe file.
Then tell it where the first Vob of your movie is by pressing (B)
and selecting it.
You can choose either a Vob or an AC3 file if you wish.
And then tell it where you want to save your final Wave by selecting
I always set the Global Output Gain (D)
to 500 to help boost volume. You can also turn up the 'inverse-squared
gain' if it is still a bit low. If you turn too many channels up you will
generally get distorted audio, so be careful. But play about with these
settings until you are happy with the output. To test the volume etc.,
press the 'Play Source' button (G).
If you have more than one Vob file (as is almost always the case), make
sure the 'Span Over Multiple VOBS Automatically' (E)
is checked. It is important that your Vob files are numbered in order
for this to work. So you should have something like:
This way, when it comes to the end of the first Vob, it will look for
the next one in the list.
One last buy very important option is (F).
Since a DVD can have many language tracks we have to select the correct
one. Usually the default '1st stream' option is English. But test it by
hitting the 'Play Source' button again (G).
Listen to see what language is played, if it is the wrong one, select
the next one above it. If that is wrong try the next one above that and
the next and so on, until you find the correct audio track you want.
When everything is done press the large 'Create my Wav' button.
Up will pop a selection box asking for what audio format you want the
DVD AC3 converted into. Choose PCM 48,000Hz 16 Bit,
Stereo. You could also choose MP3 if you wanted, but for best results
you will need to use PCM. This way you can multiplex it to the video file
and compress it using VirtualDub.
Thats it! A window like the one below will appear telling you the progress
of your conversion. Ac3Dec converts to PCM audio in real time, so it will
take as long as watching the movie to convert it into a Wave file.
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