WMA is a audio format what format is the video part??
eg, divx/avi or xvid etc ???
To find out what format the movie was originally made in both audio and video go to the link below and download and install the GSPOT proram.
http://headbands.com/gspot/
Open the prog and load your movie file into it and it will give you the info
Once you have the info we can take it from there on how to convert the video and audio so they can play on dvd.