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let me show you the answer.(just a example)step1$ ffmpeg -i ./input.mp4 \-vcodec libx264 \-vb 500k \-r 30 \-x264opts no-scenecut \-g 15 \-acodec aac \-ac 2 \-ab 128k \-frag_duration 5000000 \-movflags frag_keyframe+empty_moov \./encoded.mp4step2$ MP4Box -...

可以comment啊