ffmpeg -i uploadfile/video/test.wmv -c:v libx264 -strict -2 uploadfile/mp4/test.mp4
ffmpeg -i uploadfile/video/test.wmv -c:v libx264 -strict -2 -s 1280x720 -b 1000k uploadfile/mp4/test.mp4
ffmpeg -f avfoundation -pixel_format nv12 -i "1" -vcodec libx264 -preset ultrafast -g 15 -s ${w}x${h} -x264opts bitrate=${bit_rate} -r 10 -f flv rtmp://123.51.51.111:1935/live/livestream
ffmpeg -i playlist.m3u8 -bsf:a aac_adtstoasc -vcodec copy file.mp4
ffmpeg -i "concat:1.ts|2.ts|..." -acodec copy -vcodec copy -absf aac_adtstoasc "/out.mp4"
ffmpeg -i d41d84b33d901718a85803c3a4747fc5.mp4 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//
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