I'm currently trying to use MKVtools to convert a mkv file of an HD film into mp4. It progresses through Step 1 and Step 2 fine, but seems to just run forever after Step 2. The activity menu in MKVtools says nothing but "Step 2 Done", but the activity window on the comp says "mp4box" is running and taking up all of the computer's resources. I assume this is the muxing process when using MKVtools? It would be nice if there was a status or progress bar in MKVtools that showed you how long it would take to finish. Any idea how long an average mux time would be for an HD film using MKVtools?