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I have two video (with audio) clips that I want to join. The first clip has the following format: Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 358 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 192 kb/s (default) Metadata: handler_name : SoundHandler Side data: audio service type: main And the second: Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 320x240, 88 kb/s, 8 fps, 8 tbr, 16384 tbn, 16 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 11025 Hz, mono, fltp, 96 kb/s (default) Metadata: handler_name : SoundHandler Side data: audio ...