FFMPEG mux video and audio (from another video) – mapping issue

Overview of inputs input_0.mp4 has the desired video stream and input_1.mp4 has the desired audio stream: In ffmpeg the streams look like this: $ ffmpeg -i input_0.mp4 -i input_1.mp4 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ‘input_0.mp4’: Duration: 00:01:48.50, start: 0.000000, bitrate: 4144 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280×720, 4014 kb/s, SAR 115:87 … Read more