TMPGEnc PGMX PLAYER is software for playing Pegasys' Next Generation file format "PGMX" file that stores multiple video clips, menus and chapters all in one file*. -What is a PGMX File?- PGMX is short for Pegasys Multimedia Box. Developed by Pegasys, it can store both menu and video content into a single file (.pgmx / .mkv). The video stream is H.264/AVC, and since the file does not depend on physical media such as DVD and Blu-ray discs, it is not limited to certain video characteristics. For e