Start Remux MKV Maker (1). Click the "Select Video" button (2). Select your video and click the "Open" button (3). If you want to create more than one video, keep clicking "Select Video" to add videos to the queue. Once you are ready to create your MVA+MVB videos for all the videos in the queue, click the "Start" button. Once the process is complete you can find your new MVA+MVB videos by clicking on the "Open Output Folder" button (4).