ffmpeg tạo thumb Video

ffmpeg -i b.mp4 -ss 00:00:00 -codec copy -t 120 output1.mp4 && ffmpeg -i output1.mp4 -vf "setpts=0.2*PTS" -r 6 -an output2.mp4


ffmpeg -i b.mp4 -ss 00:00:00 -codec copy -t 120 output1.mp4
ffmpeg -i output1.mp4 -vf "setpts=0.2*PTS" -r 6 -an output2.mp4