rarely use MKV but wantedt o try it out since it support 5.1 audio and MP4 doesn't. First TV show converted fine. Second crashed PD15. When I ran PD15 again, then hardware acceleration would not work. Reboot the PC and it worked again. P15 crashed like 3 times and afterward, HA would not work. I always had to reboot my PC to get HA back. Appears that PD15 has a few bugs using MKV output. Intel i7 4770k, 16GB, GTX1060 3GB, Two 240GB SSD, 4TB HD, Sony HDR-TD20V 3D camcorder, Sony SLT-A65VK for still images, Windows 10 Pro, 64bit
Gary Russell -- TN USA