Taking a crack at this after a long time, from your logs:
ERROR> 2018-01-12T23:46:39 MCEBuddy.AppWrapper.Handbrake → Hardware encoding appears to have hung, no progress in the last 300 seconds.
This is likely due to an unstable Intel Display Driver. Try updating or using a stable Intel Display Driver.
Terminating process.
Looks like your graphics driver may have updated and the new one is unstable and it’s falling back to software encoding. Try to use a recommended version.