ffmpegでmp4からHLSへ変換する
ffmpeg -i video.mp4 \
-c:v copy -c:a copy -f hls -hls_time 9 -hls_playlist_type vod \
-hls_segment_filename "video%3d.ts" video.m3u8
音を消す場合
ffmpeg -i video.mp4 \
-c:v copy -c:a copy -f hls -hls_time 9 -hls_playlist_type vod \
-hls_segment_filename "video%3d.ts" -an video.m3u8