[Matroska-users] Problems with Theora in VLC

[Fraggle]

Hello,

I'm having a bit a trouble getting a .mkv file working in VLC (0.8.6d )
when it contains a Theora stream.  Any audio in the file plays fine, but
no video, and the messages says:

mkv error: unknown codec id='V_THEORA'
main error: no suitable decoder for module for fourcc 'undf'.
VLC probably does not support this sound or video format.

I can play the video when it's in it's original ogg container.

Any ideas?