Hardware accelerated mkv x264's (DXVA) in Vista x64

[Saosin]

This is my first post here at Doom9, so hi all! :D

I've read quite a lot of posts regarding this subject but none have mentioned anything about hardware accelerated x264 in Vista x64. I have an 8800GT 512MB (169.25 WHQL drivers) which I've heard uses Purevideo 2.

The user TheShadowRunner mentioned that CL264dec.ax version 1.99.0.1405 works perfectly for decoding 720p mkv x264's, but that version is nowhere to be found... I tried using the latest version of PowerDVD (7.3 Build 3730) but it doesn't even show an error message when I try to play my mkv x264's. God I hate PowerDVD. Anyways, I located PowerDVD's CL264dec.ax and copied it to System32 and SysWOW64 but "regsvr32 CL264dec.ax" won't register the file, it just gives me the following error:
The module "CL264dec.ax" may not compatible [sic] with the version of Windows that you're running. Check if the module is compatible with x86 (32-bit) or x64 (64-bit) version of regsvr32.exe.

So, what can I do to make hardware accelerated x264's possible? Is it even possible today?

[CruNcher]

There are still problems under yet uknown circumstances that can couse problems with Hardware Playback especialy with .MKV Haali Splitter->Cyberlink Decoder.
It's hard to find something to explain them as their is no action from Haalis side yet to look into this, because he can't really replicate them without the Hardware.
PowerDVD is restricted to a certain type of playback formats it will not accept .mkv but you can try to rename it to something else and try to playback it for example .m2ts should work
Here http://forum.doom9.org/showthread.php?t=132924&page=11 you gonna find all the answers to problems with X264 and Hardware accelleration most problematic ones are fixed or worrkarounds are existing. Can't help you tough with your Vista problems as im not on Vista sorry.

[Saosin]

Re-encoding is not an option, but thanks for the answer anyhoo.

One question still remains - does anyone know how to register CL264dec.ax in Vista x64?

[audyovydeo]

One question still remains - does anyone know how to register CL264dec.ax in Vista x64?

I think your error message was plain enough : Vista64 most probably does not want to register this 32-bit codec.

I've managed to register that codec in XP32, but you get other errors
("Cannot load the Cyberlink H.264 driver file. The driver file may be missing").
Tried with 1.7.0.1626, 1.7.0.2203, 2.0.0.1904

So i'm not sure one can use CL264dec.ax without PowerDVD, let alone install a 32-bit version on 64-bit Windoz

cheers
audyovydeo