Recording video to Matroska file

I am trying to record a video to a Matroska file. I set my sout as:

--sout=#standard{access=file,mux=matroska,dst='file.mkv'}

However, I am unable to play the recorded file. During recording I get 
the error "matroska: Dimensions not set"
Any ideas what I may be doing wrong?
David

-- 

David R Robison
Open Roads Consulting, Inc.
103 Watson Road, Chesapeake, VA 23320
phone: (757) 546-3401
e-mail: [email protected]
web: http://openroadsconsulting.com
blog: http://therobe.blogspot.com
book: http://www.xulonpress.com/bookstore/bookdetail.php?PB_ISBN=9781597816526



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