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Extracting .ovl and .aux files? Elite Dangerous.

Read or post about compression. And decompression. Or ask questions how to decompress your files.
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eriger777
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Extracting .ovl and .aux files? Elite Dangerous.

Post by eriger777 » Thu Feb 05, 2015 1:46 am

I recently got a copy of a space game and id like to be able to extract the audio/models from the game.

I've attached an example .ovl file and a .aux file below. I have no knowledge on reverse engineering file formats. So I'm sorry if I'm not the best at learning things. However i will try to do the best that I can. I was able to gather a bit of information on the web. However no one has archived this yet.
'The OVL and OVS files are compressed with zlib. OVL files make up parts of a virtual serialized filesystem, and are partially compressed. OVS files are completely compressed and contains most of the bulk data. Can't give you more info than that at the moment as I'm at work and I've not looked at them for a while.'
Here is the top of the .aux file in hex workshop.
Quick Update: I was able to extract some of the files and get the proper name. However, I'm not able too play them. They're corupt.

I used this quickbms script.
Image


viewtopic.php?f=13&p=74664#p74664

Here is the top of the .aux file in hex workshop.
Image

Here is the .ovl file.
Image


OVL FILE DOWNLOAD: https://mega.co.nz/#!Cx5nHLTa!JgTCENPHM ... orLIdPibqs

AUX FILE DOWNLOAD: https://mega.co.nz/#!60YAkQ5Q!6M_aexZSx ... KM7t26BaUs

AlphaTwentyThree
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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by AlphaTwentyThree » Thu Feb 05, 2015 10:43 am

The OVL contains zlip compressed data (see attachment).
The aux consists of multiple wwise ogg files. Run that one through a file format scanner, searching for WAV, then parse with ww2ogg (codebooks_aoTuV_603).
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eriger777
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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by eriger777 » Thu Feb 05, 2015 4:48 pm

Thanks! I got the .aux working perfectly. However I'm a tad confused on what I should do as the next step on the .ovl file.

eriger777
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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by eriger777 » Sun Feb 08, 2015 2:55 am

Bump?

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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by AlphaTwentyThree » Mon Feb 16, 2015 2:06 pm

eriger777 wrote:Thanks! I got the .aux working perfectly. However I'm a tad confused on what I should do as the next step on the .ovl file.
Well... what is your goal? ;)
If you like what you see, why not click the little Thank You button? ;) It will definitely motivate me! :)
And here's Mr.Mouse's Facebook link: http://www.facebook.com/permalink.php?s ... 8469022795 - thanks ;)

eriger777
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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by eriger777 » Fri Feb 20, 2015 4:23 pm

AlphaTwentyThree wrote:
eriger777 wrote:Thanks! I got the .aux working perfectly. However I'm a tad confused on what I should do as the next step on the .ovl file.
Well... what is your goal? ;)
Id like to be able to get the textures/models. I can send you some more sample files from the models folder?

DancingRobot
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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by DancingRobot » Thu Jul 30, 2015 3:29 am

Was anything figured out on this?

I am interested on trying to extract some sound files also.

locastan
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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by locastan » Tue Oct 13, 2015 11:33 am

Well...I made a little progress in trying to get the textures out of an ovl. I extracted a powerplay icon (...FORC-FDEV-D-1010\Win32\Items\UIStreams\PowerIcons\PowerIcon0\Data.ovl)

First step ofc. offzip on the ovl in question. The extracted dat file seems like a dds file with custom header:
Image
I tried to load it as raw image format in IrfanView (64x64 32BPP RGBA) and could barely recognize a bit garbled ALD Power logo:
Image

I then removed the FFFF and 0000 Blocks to only get the data and loaded again (64x32 32BPP RGBA):
Image

Its not pretty, but should give the more experienced image hackers here some starting point I hope. :)

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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by shakotay2 » Thu Oct 15, 2015 8:44 am

dunno about the icon but when I extracted Data.ovs.textures_l0 from Eagle_Textures
I got this with BC2_UNORM_SRGB (unsure about palette):
eagle.JPG
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Bigchillghost, Reverse Engineering a Game Model: viewtopic.php?f=29&t=17889
extracting simple models: viewtopic.php?f=29&t=10894
Make_H2O-ForzaHor3-jm9.zip
"You quoted the whole thing, what a mess."

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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by locastan » Thu Oct 29, 2015 9:37 am

That looks quite good, despite the colors.

Here is what it looks like in game: http://www.degacom.de/index.php?attachm ... agle3-jpg/
You definitely see those serrated parts in your texture where the paint has worn off at the edges of the ship.

Could there be some kind of alpha map or normal map superimposed causing the color shift?

What does it look like if you swap RGB->BGR or GRB?

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shakotay2
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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by shakotay2 » Thu Oct 29, 2015 8:22 pm

there's no improvement - BGR looks like this for example:
BGR.JPG
Think it's a matter of palette but I don't have the patience to assemble/get the correct one from a 30 MB file.
You do not have the required permissions to view the files attached to this post.
Bigchillghost, Reverse Engineering a Game Model: viewtopic.php?f=29&t=17889
extracting simple models: viewtopic.php?f=29&t=10894
Make_H2O-ForzaHor3-jm9.zip
"You quoted the whole thing, what a mess."

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Re: Extracting .ovl and .aux files? Elite Dangerous.

Post by anotheruser » Tue Mar 28, 2017 5:01 pm

Holey Moley - what a bump!

But did anyone figure out anything about the audio?

I have a 420MB "audio_music_bnk_s.aux" file which I can't extract, despite my best efforts :(

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