In step 4, the number of files we want to join is in the value of n (default is 2). Map the resulting audio and video streams to the output.Select the actual streams in a specific order: video and audio from the first, second, and third file.Use -filter_complex to select streams from the input files. ![]() Here’s a quick rundown of what’s going on in the command: To explain the contact filter, we’ll use start.mkv, body.mkv, and rear.mkv with a single audio stream: $ ffmpeg -i start.mkv -i body.mkv -i rear.mkv -filter_complex \
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