Windows 7 and GBPVR

[whurlston]

Hmm, that I'm not sure. I haven't used MP3 since switching to Win 7 so you could be right about that.

[crlorentzen]

This should put you on the right track:
http://thegreenbutton.com/forums/t/78749.aspx - Step 7 under 'configuring the tools' is all you need, apart from installing ffdshow or whatever.
Basically you need to 'take ownership' of the DMO codecs, and just rename them to stop them working - then you can use whatever codec you want. I think it only applies to MP3 and MPEG2 - I only disabled MP3DMOD.DLL as it was the only way I could get Ffdshow to be used in Windows 7 (so I could use the dolby prologic decoding for DivX/XviD files with MP3 sound).
It could be that you need to try other codecs for Mpeg2 and Mpeg4, as I have not seen anything like the 'hiks' you describe in Windows 7 (except when any OSD menus are present in EVR)

Thanks for the link, it got me looking in the correct direction to fix the issue. I had to rename msmpeg2adec.dll, to get control of MPEG 2 audio streams, as well as MP3DMOD.DLL, for MPEG 1 - layer 3 audio streams.

I am not sure why GBPVR didn't use the codec specified in Config (ffdshow). Also I am not sure why the Microsoft Decoders were being used when the system default was ffdshow, as tested in Media Player Classic with all internal codecs (source filters and transform filters) disabled.

Must be the way that GBPVR asks the system to generate the graph I guess.