I have been playing a little with MM 4.03 as a DLNA server for my Denon 3311ci AVR as a renderer. The Denon only does audio, though it does do AAC from M4A and AAC files (at least, that's how I read Denon's manual). For some reason I tried sending some MP4 files (AVC/AAC) and I was surprised the Denon played the AAC and showed the cover art / metadata. I don't think MM4 is doing any conversion on MP4 files, right? Is there some way to determine exactly what MM is sending? I do seem to lose a couple seconds of audio at the end of the file.
Also, the "webhelp" on auto-conversion could use some fleshing out. I think I get the gist of it but it's kind of hard since I can't seem to see exactly what is coming out of MM. For example the "supported formats" (although the pop-up window is titled "compatible formats" which makes more sense in the context of the conversion rules). I take it the way the format rule is parsed is first the file format is examined and if that passes then the audio and video streams are examined?