In this guide I will show you how to extract the audio from your AVI file and save it as a .AC3 file.
You will need <a href="http://www.digital-digest.com/software/download.php?sid=237&ssid=0&did=15" target="_blank">VirtualDubMod</a> for this guide. This method will only produce a true AC3 file if the source audio is actually AC3 audio. If it isn't VirtualDubMod will just demux it with the file extension .AC3 . It would still be a constant bitrate mp3 etc.
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Go ahead and start up VirtualDubMod and load your AVI file. You would do so by clicking "File", then "Open video file..." (red). [Screen Shot Below]
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This error message might pop up, if it does click "No" (blue). [Screen Shot Below]
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After it has loaded, click "Streams" at the top (green) then click "Streams List" (purple). [Screen Shot Below]
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After that this screen will come up. Here just click the audio stream (red) in the list, then click the "Demux" button (blue). [Screen Shot Below]
You will need <a href="http://www.digital-digest.com/software/download.php?sid=237&ssid=0&did=15" target="_blank">VirtualDubMod</a> for this guide. This method will only produce a true AC3 file if the source audio is actually AC3 audio. If it isn't VirtualDubMod will just demux it with the file extension .AC3 . It would still be a constant bitrate mp3 etc.
<hr>
Go ahead and start up VirtualDubMod and load your AVI file. You would do so by clicking "File", then "Open video file..." (red). [Screen Shot Below]

<hr>
This error message might pop up, if it does click "No" (blue). [Screen Shot Below]
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<hr>
After it has loaded, click "Streams" at the top (green) then click "Streams List" (purple). [Screen Shot Below]
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<hr>
After that this screen will come up. Here just click the audio stream (red) in the list, then click the "Demux" button (blue). [Screen Shot Below]
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