Audio is there and I can hear it without problem on PC...
But on TV it says "audio AC3 not supported" and I'm sure it is supported.
However, stream seems to be a bit "exotic", english is 2nd audio and 1st is german but empty (only header). Probably TV is disappointed by this and doesn't detect well audio to play.
I see only one solution, you have to "fix" concerned streams with a tool such as 'TSdoctor'. I just tried and now I have english audio on TV. Unfortunately this tool is Windows software, not Mac
PVRtoTS just decode "as is", it doesn't care of what's in stream.