I have two files, video.mp4 and genaudio.mp3 (both same length). How can I merge the MP3 file with the MP4 using FFMPEG (or any command line program)?
This is what I have so far, but it doesn't replace the audio after spitting it out:
ffmpeg -i video.mp4 -i genaudio.mp3 -c:v copy -c:a mp3 output.mp4 -y