I really like WMP11 as my media player/server but unfortunately it's
missing support for the fast becoming cross platform industry standard
H.264/MP4 and could not stream my videos to my Xbox 360. Thankfully
looking over MSDN I found that it was possible to introduce custom
file formats into WMP and I was successful in creating a registry
patch which can stream H.264/MP4/M4V & AAC/M4A to my Xbox 360 from
WMP11.

http://a8t8.spaces.live.com/blog/cns!2518DD508BB713E8!156.entry

With that out of the way although the primary purpose has been
fulfilled I would like to improve on it if possible but here is where
I have hit a brick wall.

There are two outstanding minor issues that I would love to fix and
better tie MPEG4 support into WMP if it is actually possible;
1) The length of audio/video for custom formats is not displayed in
the library or during the now playing when you play something from the
library.
2) Seeking is not supported (is that the right term?) where you can
jump to any point in the video, fast forward/rewind etc when you play
something from the library.

But.. seeking will work if you open the MP4/M4V/M4A in WMP through
explorer or through the File-Open menu in WMP or if the videos end up
in the "Other Media" category in the library. The time length of the
media file also sort of displays semi properly when you do this too
though only for a brief moment if you jump to various points in the
file it will display the time length.

Why it partially works in one way and not through the other I have not
been able to figure out at all & looking over MSDN and the registry I
cannot locate anything that points me in the right direction. Ideally
I would like to at least enable seeking for MP4/M4A/M4V if playing
them through Windows Media Players own media library.

(I have also looked pretty much at every WMP MPEG4 add-in pack and
splitter, registry tweak that's out there and none have been able to
overcome this.)

Is it even possible for custom formats to be fully integrated into
WMP's own library ?

Thanks for any pointers or enlightenment anyone can share.