Yaobing, maybe interesting:
The clients doesn't seems to rapport the Tuners status correctly.
Under Show Status at Client 1 it shows all four tuners as idle.
And actually 2 out of 4 were in use.
When looking into MC Server i can notice one tuner been used for a recording.
The second client doesn't rapport the actual recording neither, only the tuner used by itself.
As the signal level is also missing from the OSD.
I'm guessing the status and additional feedback, like signal q, isn't collected from the RTSP.
Maybe this info is helpful somewhere.