MakeMKV errors classification
You were directed to this page because MakeMKV encountered errors during processing. These errors all fall into one category usually caused by a single failure. The detailed error description is below.
IPC error (Mac OS X)
The IPC error happens when operating system (Mac OS X) suddenly "looses" the Blu-ray drive. Most of the time this happens with external USB drives and is caused by inadequate USB power. Please try using a powered USB enclosure (or powered USB hub) and short USB cables.