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Quick one-liner to merge audio narration with a video
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| ffmpeg -i narration.mp3 -i original.mp4 -filter_complex "[0:a][1:a]amerge,pan=stereo|c0<c0+c2|c1<c1+c3[a]" -map 1:v -map "[a]" -c:v copy -c:a aac -shortest output.mp4 |
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