10.1. Time to start extracting the audio. This is where my knowledge really fades away, so, if anyone can see anything incorrect here, please, feel free and let me know. First we need to open command prompt. Do so if you know, if you don't,go "Start > Run > Type 'cmd' " or press "Ctrl + R and type 'cmd' ". Then press "Ok"

10.2. Now, what you need to do, is changed the directory Command Prompt is looking in to the directory you extracted EAC3TO. If you listened to me, you should be able to directly type my string in to do it, otherwise, you will need to find it out. The command for opening a folder is:
Code:
cd <drive letter>:\<directory 1>\<directory 2>\<directory 3>\
If for some reason, you decided to make life difficult and extracted EAC3TO more than three folders deep, than the pattern just keeps going, I'm just not gonna sit here and type it down to the windows limit of 32000. (This guide's taking long enough :p)
For me, I type:
If you haven't typed something correctly, like forgotten a drive letter, or a backslash, or the folder simply isn't in that location. You will get a message saying:
Code:
The system cannot find the path specified
In that case, go back and try it again
If it HAS worked out correctly, it won't give you any special message, instead, it'll just have what used to be just:
To what it should be for this to finally work now:
Hopefully your Command Prompt window should look something like:

10.3.1. NOTE: All strings from here on in, will only work if you have successfully opened the EAC3TO directory in Command Prompt. Now, this is where things may get slightly confusing, as I guarantee all of us have placed our movie in different locations. Bear with me though, I'll try and make this as simple as possible.
What we need to do here, is open the main .M2TS file, with the program to search for the audio streams. The string you have to enter will be:
Code:
eac3to <drive letter>:\<directory 1>\<directory 2><directory 3><directory 4><main .m2ts file name>.m2ts
NOTE: Remember how I said to rename the output folder back in step 8.6? Well guess what, if you've done it, your fine here, if not, you have to remove the spaces from your folders names because this program will not work with spaces in folder names.
In my case, with the folder stored in the root directory of my W
drive, I must type:
Code:
eac3to W:\the_dark_knight\bdmv\stream\00007.m2ts
If everythings worked out, your command prompt window should look a little something like this:

10.3.2. Here's just the little rundown of what those mean
1) "Chapters, 39 Chapters" That's just the chapters in the movie. If you want a little more information about the movie, look slightly above that in white bold.
2) "VC-1, 1080P24 /1.001 <16:9>" That's the main video stream, encoded in VC-1, has a resolution of 1080P, runs at an average of 24 Frames Per Second, and has an aspect Ratio of 16:9
3) "AC3, English, 5.1 Channels, 640KBPS, 48kHz". That's the Audio stream, and the one that I will be using. It's encoded in AC3, spoken in english, utilizes 5.1 Surround sound, and is at a bitrate of 640kbps. NOTE: You'll need to remember what type of stream it is you are using, whether it's AC3 or DTS for later. For AC3 go to 10.4 for DTS go to 10.5
4) "True HD/AC3" That's basically the same thing, as you can see, it's got #3 embedded into it anyway.
5-11) They're all audio streams for different languages.
12-35) All the subtitles. You can extract these if you want, but I don't know how, and it's not necessary, so I won't be explaining how to do so :p
10.4. To extract the audio of an AC3 stream, you must use the following command:
Code:
eac3to "<Source Drive Letter>:\<Source Folders>\<File name>.m2ts" <Track #>: "<Destination Drive Letter>:\<Destination Folders>\Audio Track.ac3"
Following that, using my encode as an example, the command would end up being:
Code:
eac3to w:\the_dark_knight\bdmv\stream\00007.m2ts" 3: "w:\the_dark_knight\audio_track.ac3"
If all has worked out correctly, command prompt should show something like this:

Once it has finished, it should say "Done" and look a little something like:

10.5. For DTS/TrueHD Audio, I'm extremely sorry, but I haven't dealt with that yet, so I'm not sure on how to do it. Once I come across one, and figure out how to do it correctly, then I shall update this thread. In the mean time, just search for extracting DTS audio from .M2TS files on google....Once again, I apologize.
10.6. Now you should have successfully extracted the audio from the blu-ray movie. You can now close Command Prompt by pressing the X in the top right corner, or by typing "Exit". Whatever suits you.