Input #0, matroska,webm, from '../avidemux/VTS_05_1_1st_half_encodethis.mkv': Metadata: ENCODER : Lavf58.20.100 Duration: 00:40:10.33, start: 0.040000, bitrate: 4234 kb/s Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], SAR 1:1 DAR 5:4, 25 fps, 25 tbr, 1k tbn, 50 tbc (default) Metadata: DURATION : 00:40:10.320000000 Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s (default) Metadata: DURATION : 00:40:10.328000000 At least one output file must be specified