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I have a video that first audio stream is aac and the second is DTS. I want to copy the first one but re-encode the second one to aac. The code I use usually is:

#!/bin/bash
ffmpeg -hide_banner -stats -i "Movie.mkv" -c:v libx265 -x265-params crf=20 -map 0 -c:a copy "MovieOut.mkv"

How to do this?

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Use

ffmpeg -i "Movie.mkv" -map 0 -c:v libx265 -x265-params crf=20 -c:a:0 copy -c:a:1 aac "MovieOut.mkv"

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