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ffmpegHow to use map to select streams


If you want to select specific input streams (e.g. first video channel from first file and third audio channel from second file) and use them for your output, you use map:

ffmpeg -i in.mp4 -i in.mp3 -map 0:v:0 -map 1:a:2 out.mp4ctrl + c
-i in.mp4

first input (video file)

-i in.mp3

second input (audio file)

-map

maps selected input streams to output

0:v:0

map first video stream of first input

1:a:2

maps third audio stream of second input

out.mp4

resulting video file