[Q] Extracting, editing, .obb files? - Android Q&A, Help & Troubleshooting

Hello all. I was wondering if anyone could give me some information on how to extract an .obb file so that one can edit the contents. In my other thread ( http://forum.xda-developers.com/showthread.php?t=2373834 ) where I was trying to figure out a way to activate the Japanese vocal track in Final Fantasy IV with the game's locale in the US/English. I've hit an impasse as I've been able to deduce that the Google play version of the game (which seems to have a 15mb .apk, and a 400+mb .obb ) retains the Japanese audio track but only plays it in conjunction with JP text if the Android locale/language is Japanese. Thus, I figure that somewhere in that .obb there will be the JP audio track file which I can copy over the English audio track file and thereby access Japanese audio w/ English text since SquareEnix didn't give us the option for some god-awful reason.
However, the only way this can work is if I can get into that .obb file! I saw links elsewhere on the forum suggesting that all I had to do was rename the .obb to a .zip or .rar, and then use 7zip or WinRAR to open it, but attempts with both programs and numerous file types (.zip, .rar , .tar etc..) all report that the file is not an archive and thus cannot be opened. This is different from the .apk file, which easily seems to (upon rename to zip) unveil its secrets with 7zip extraction. So, does anyone know a program or method necessary to unpack/extract/read/edit an .obb file besides the simple archive rename? Is there some Android development program or function?
I'd very much appreciate any insight into how to unpack/edit an .obb file! Thanks!

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Anyone? Can't seem to find any data on this, especially anything sounding remotely reliable, on other sites...

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RanceJustice said:
Anyone? Can't seem to find any data on this, especially anything sounding remotely reliable, on other sites...
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Have you tried 7 zip?? I am also looking to extract it for in game music lol

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jetbruceli said:
Have you tried 7 zip?? I am also looking to extract it for in game music lol
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I have attempted to extract it with 7zip, but to no avail. It says it cannot extract it as an archive. I'd still love to figure out how to do so, to swap around the vocals, but sadly without unpacking the .obb somehow it doesn't seem possible. I am guessing that by the name "opaque binary blob", these are intended to be difficult to unpack/decrypt etc... though perhaps some are easier than others. Are .obb s created via some sort of encrypting process? compiling? both?

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RanceJustice said:
I have attempted to extract it with 7zip, but to no avail. It says it cannot extract it as an archive. I'd still love to figure out how to do so, to swap around the vocals, but sadly without unpacking the .obb somehow it doesn't seem possible. I am guessing that by the name "opaque binary blob", these are intended to be difficult to unpack/decrypt etc... though perhaps some are easier than others. Are .obb s created via some sort of encrypting process? compiling? both?
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Yeah they are encrypted because some open with 7zip like Aspault 8 and other likes NFS Most wanted they in the APK file.

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Hi, did you ever find the solution to this problem? I myself am trying to open the same obb file(to fix the stupid "Load Captain" typo at the start). I have decompiled the apk but am at a loss as to what I should do next. I originally tried dumping the obb file using Jobb, but received a "magic key does not match" error, which leads me to believe it's not a standard archive. The only place I can think of looking is in the .so file, but I'm not sure if I have the patience to sift through all of it.... Keep us posted on any developments, thanks to anyone who can help!
---------- Post added at 04:51 PM ---------- Previous post was at 04:33 PM ----------
A quick search through the apk yields only one result to the string .obb, in the 'DLActivity.class' file.
Code:
static String a()
{
String str = DLActivity.class.getPackage().getName();
return Environment.getExternalStorageDirectory().getPath() + "/Android/obb/" + str + "/main." + 131 + "." + str + ".obb";
}
Now considering the actual name of the obb file is "main.131.com.square_enix.android_googleplay.FFIV_GP.obb" we seem to be on the right track...
I will keep experimenting, let's keep this thread alive!

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try with "RAR for Android"
I even managed to extract obb from gta3 (1.2 GB)

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@RanceJustice it's pointless to swap English audio with Japanese if you can't even understand it. If you can understand it then you should buy the Japanese version. IMO FF4 is better w/o any voices as both the ENG and JPN are medicore.
@jetbruceli the game uses AAC streamed audio nothing special, the music is pre-recorded and you can buy it for $7. You want Final Fantasy IV DS Original Soundtrack.

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RAR for Android as recommended by @cojocaruflrn works!

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Rename the file from .obb to .zip and open the file with winrar thats how you can extract the files from within it how to edit the files inside the .obb are a different question

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Can I rename zip file to apk file,

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any progress? i'm trying to decrypt .obb files from fifa16

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It is possible
I see some videos on YT, editing .OBB files from GTASA, & they just use WinRAR!, but.. How?
youtu.be / 9paQDBMv8wQ

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I could do it, just change .obb to .zip ON ANDROID, (Using some root explorer or WinRar) that's all, sorry for my english gg

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Deathracelord said:
Hi, did you ever find the solution to this problem? I myself am trying to open the same obb file(to fix the stupid "Load Captain" typo at the start). I have decompiled the apk but am at a loss as to what I should do next. I originally tried dumping the obb file using Jobb, but received a "magic key does not match" error, which leads me to believe it's not a standard archive. The only place I can think of looking is in the .so file, but I'm not sure if I have the patience to sift through all of it.... Keep us posted on any developments, thanks to anyone who can help!
---------- Post added at 04:51 PM ---------- Previous post was at 04:33 PM ----------
A quick search through the apk yields only one result to the string .obb, in the 'DLActivity.class' file.
Code:
static String a()
{
String str = DLActivity.class.getPackage().getName();
return Environment.getExternalStorageDirectory().getPath() + "/Android/obb/" + str + "/main." + 131 + "." + str + ".obb";
}
Now considering the actual name of the obb file is "main.131.com.square_enix.android_googleplay.FFIV_GP.obb" we seem to be on the right track...
I will keep experimenting, let's keep this thread alive!
Click to expand...
Click to collapse
Were you able to unpack and repack the Final Fantasy OBB? I am trying to do the same.

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rename it to. zip instead of obb.
Install zarchiver and es file explorer and do the cut,copy, paste,edit

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Dark Knight Begins said:
rename it to. zip instead of obb.
Install zarchiver and es file explorer and do the cut,copy, paste,edit
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Click to collapse
That doesn't work for all OBB files, most of them use different compression methods, and I am not skilled enough to find out which compression method the one I am trying to unpack is using.

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[email protected] said:
That doesn't work for all OBB files, most of them use different compression methods, and I am not skilled enough to find out which compression method the one I am trying to unpack is using.
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I edited gta series, fifa 12(data),14 on that method.
What u wanna do?

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Dark Knight Begins said:
I edited gta series, fifa 12(data),14 on that method.
What u wanna do?
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Final Fantasy 5 OBB, I don't think SquareEnix uses the same compression method as ZIPs.

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[email protected] said:
Final Fantasy 5 OBB, I don't think SquareEnix uses the same compression method as ZIPs.
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Click to collapse
maybe