The Athlon XP cpu and the “Applied Micro APM82181 1GHz” cpu in the the WD MBL are not even close
while yes its possible to get twonky to transcode, they dont officially support transcoding at present
but I wouldnt attempt it on the WD MBL, not worth the effort
It might be best to determine what the blueray player can and cannot play
and then once you know that, you can make a more informed desciscion
on what direction of products or formats you want to use for streaming