I have a Matroska file I put together from a rip of a DVD track with multiple angles. I can choose which track to view with -vid, but I'd like to be able to select during play with the underscore key. From the man page, however, it appears that's not an option for mkv files: _ (MPEG-TS, AVI and libavformat only) Cycle through the available video tracks. -identify gives us: ID_VIDEO_ID=0 [mkv] Track ID 1: video (V_MPEG2), -vid 0 ID_VIDEO_ID=1 [mkv] Track ID 2: video (V_MPEG2), -vid 1 ID_VIDEO_ID=2 [mkv] Track ID 3: video (V_MPEG2), -vid 2 ID_VIDEO_ID=3 [mkv] Track ID 4: video (V_MPEG2), -vid 3 ID_VIDEO_ID=4 [mkv] Track ID 5: video (V_MPEG2), -vid 4 Any thoughts on how hard this would be to support? mrc