Tvheadend

Lately I've been having stream issues and continuity errors. I am unsure whether it's related to fluctuating signal quality, my hardware/tuner, or a combination. I've read some posts that mention increasing the buffer for the mux/service to help with this, but I can't find it for IPTV muxes. (Unless this is the 'Buffering limit' setting; if it is, is there a way to change that for the entire network instead of needing to modify each mux individually?)

The reason I need to use IPTV streams is because TVH's HDHomeRun support does not include support for the -CC (CableCard) models. (CableCard tuners use virtual channel maps provided by the CableCard or Tuning Adapter, so specifying a frequency and program will not work; the hardware will tune it, but unless it is addressed by the virtual channel number from the CableCard, it will not decrypt the stream.)