I am having an issue when I trim the video. I am using DVDFab for Mac 9.2.0.8. I select MKV Passthrough as the output version. It will not trim at the second or frame I select. It seems to happen on black frames. I will trim to the last black frame, but it will jump 2 or 3 second to the last none black frame once I start the conversion. In the trim utility, it will display correctly. This happens every time I select a black frame at the end. If it is a none black frame at the end it will not skip. And on occasions the audio is not synced correctly after the conversion using the trim.