There is a Mezzmo Roku app, but it uses the Roku Media Player as the play engine.... But then the Mezzmo Android app uses VLC, so there's that. Based on my research, the Roku devices don't support passthrough.
As far as client... Any client that supports DLNA playing will work. For instance, I have used VLC and MX Player both to play from Mezzmo. I did have to use a helper app with MX Player though.
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