Have you tried streaming via RTSP? If you need to stick with MMS (which is depreciated) you can try to add additional query strings to the URL. Here is an example:
To specify that Windows Media Player has a 50 Kbps connection speed, and that it is trying to get a 100 Kbps stream from the content:
HTML Code:
mms://server/content.wmv?WMBitrate=50000&WMContentBitrate=100000
You can check out all the additional query strings for Windows Media Player
here.
If you want more information about Intellegent Streaming you can read about it
here.
Let us know how it goes!