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ffmpeg -hwaccel videotoolbox -i glitch.mp4 -i video-with-new-audio.mp4 -i glitch.mp4 -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0]concat=n=3:v=1:a=1[vv][aa]" -map "[vv]" -map "[aa]" -c:v libx264 -r 50 -c:a aac -strict experimental -b:a 320k output.mp4 |