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FFMPEG can make video from MP3 file and still image:

ffmpeg.exe -loop 1 -i "img.png" -i "%1" -c:v libx264 -tune stillimage -shortest "%1.mp4"

But it honestly encodes the still image during the whole encoding process instead of encoding only a small piece, from key frame to key frame, and then just repeating it. Is there any way to optimize this?

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