I've been trying out the MythStreamTV functionality since upgrading from R5D1 to R5E50. I could get the stream to start, but the controls didn't seem to work from the StreamTV page. After poking around a while, I found the following changes would get the control buttons working ...

Edit the following files ....

/usr/share/mythtv/mythweb/modules/streamtv/tmpl/default/selectstream.php
/usr/share/mythtv/mythweb/modules/streamtv/tmpl/default/createfile.php

in both files, find occurrences of this path ...

/usr/share/mythstreamtv/

and replace it with ...

/myth/streamtv/

You'll need to do the same thing to the same named files in the .../compact directory as well if you use that template.

In addition, I found the path to the ivtv-tune binary in this file ...

/myth/streamtv/ivtv-tune.sh

needs to be changed from...

/usr/bin/ivtv-tune

to...

/usr/local/bin/ivtv-tune

That makes the channel change command go thru, but I haven't yet figured out what it's supposed to do. I'd love to hear if anyone gets Live TV streaming, as it looks like that's what it's for.