Category: Photography & Video Editing

Let’s assume that an MP4 video file has two audio streams, but you only want to keep one.

The following line will create a new mp4 video file that only has the first audio stream:

ffmpeg -i input.mp4 -map 0:v:0 -map 0:a:0 -c copy output.mp4

The following line will create a new mp4 video file that only has the second audio stream:

ffmpeg -i input.mp4 -map 0:v:0 -map 0:a:1 -c copy output.mp4