====  Separate and join again the audio and video from a file using ffmpeg ====

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To **remove audio** from the video file:
<code bash>ffmpeg -i video.mp4 -c copy -an video.out.mp4</code>

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To **add audio** to the video file again:
<code bash>ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac output.mp4</code>