Out of curiosity, why don't you just use MythTV to do the streaming, too? 
You can tell it to use VLC as the video player.

On Tue, 7 Feb 2012, Raymond Norton wrote:

> I use a box for both mythtv and streaming vlc. I need to kill mythtvbackend 
> to make the dvb adapter available to vlc, which is not a problem. However, 
> something has changed that I am not aware of and even though I killall myth, 
> vlc says the dvb adapter is not available. Is there a way to issue a command 
> that frees up the adapter, regardless of what is using it, or  at least find 
> the process that is using it?
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-Yaron

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