While trying to tweak errors away from my MP logs, I found many lines like these in TsWriter.log:
[2016-11-02 10:30:31,698] [a156c20] [273c] - pmtgrabber: set callback:6fbfc38
[2016-11-02 10:30:31,698] [a156c20] [273c] - pmtgrabber: grab pmt:105 sid:1111
[2016-11-02 10:30:41,704] [a156c20]...