Audio Extracting With VirtualDub

[aliahmed]

When I Extract a .wav file from a movie in virtualdub the .wav file turns out to be more than 500 MB!! (The Video is only 200 MB). I followed the DivX to VCD Conversion Guide and they said the audio file would be about 10 MB mine is 500.
Does anyone know what the problem is? If you do please help.

[pijetro]

I'll take a guess at the guide you were reading, and assume that you got mixed up with the type of extraction. The 10mb you're referring to seems to me like a demultiplex(straight removal) of an ac3 or mp3 file (audio, direct stream copy), whereas the 500mg file is coming from a full process conversion of an audio format that gets uncompressed to PCM.

[aliahmed]

How do you do a straight extraction (demultiplex), from a .avi?

[pijetro]

Wait a minute, you said you went to the post of divx to vcd. http://www.vcdhelp.com/divxtovcd.htm.
It actually says to watch out, because your file does turn into a huge uncompressed .wav.
But to answer your question, when you go to the audio>direct stream copy, and then scroll over to File>save as wav, what you're doing is telling Vdub to rip the audio from video without any changes. (perhaps an AC3 file). This is why you'll only get a 10 mb file, because it's already compressed. You haven't changed a thing.
What the guides are saying, is that you should change the AC3 (or whatever other compression you've got), to an uncompressed .wav. To do that, you must go to Audio>full processing>uncompressed pcm, then scroll over to File>save as wav.
What you're saying is, rip the audio and at the same time, uncompress it.
The reason for all of this, is because, you're going to eventually merge the new audio file (your uncompressed .wav) with your AVI video when you encode it for VCD via Tmpegenc. (I'm assuming that's what you'll use).
I'll receive write backs about this, but that's the basics of it all.

[aliahmed]

Once you put the big wav and the avi together does it mostly turn out to be under 700 MB. I only want to make my movie on one disc and my movie is under 80 min.