[MEncoder-users] Bug / feature request

[Will]

I have managed to re-encode an mpeg file into two files "video.avi"
and "audio.ogg" using mencoder x264 and oggenc respectfully.
When i try to mux the files into one i get this output
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mkvmerge v2.0.0 ('After The Rain Has Fallen') built on Feb  7 2007 18:53:46
'video.avi': Using the AVI demultiplexer. Opening file. This may take
some time depending on the file's size.
'audio.ogg': Using the OGG/OGM demultiplexer.

Error: 'video.avi' track 0: Could not extract the decoder specific
config data (AVCC) from this AVC/h.264 track.
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I use Kubuntu Feisty, with ubuntu & medibuntu repositories on AMD
Duron machine. Is this a bug or did I miss something in the process?