ffmpeg での一枚絵動画の作り方
ffmpeg -loop 1 -i img.png -c:v libx264 -t 30 -pix_fmt yuv420p out.mp4
https://trac.ffmpeg.org/wiki/Create%20a%20video%20slideshow%20from%20images より
ffmpeg -loop 1 -i img.png -c:v libx264 -t 30 -pix_fmt yuv420p out.mp4
https://trac.ffmpeg.org/wiki/Create%20a%20video%20slideshow%20from%20images より