四画面
ffmpeg -i ~/Downloads/1.mp4 -i ~/Downloads/2.mp4 -filter_complex "[0:v]pad=iw*2:ih*2[a];[a][1:v]overlay=w[b];[b][2:v]overlay=0:h[c];[c][3:v]overlay=w:h" -y ~/Downloads/out.mp4
双画面
ffmpeg -i ~/Downloads/4.mp4 -i ~/Downloads/1.mp4 -filter_complex "[0:v]pad=iw*2:ih[a];[a][1:v]overlay=w" -y ~/Downloads/out.mp4
混音【背景声音和MP4声音同时存在】
ffmpeg -i ~/Downloads/4.mp4 -i ~/Downloads/mp3.mp3 -filter_complex "[1:a]aloop=loop=-1:size=2e+09[out];[out][0:a]amix" -ss 0 -t 60 -y ~/Downloads/out_mp3.mp4
去掉原视频音轨
ffmpeg -i ~/Downloads/4.mp4 -c:v copy -an ~/Downloads/out_jy.mp4
添加背景音乐
ffmpeg -i ~/Downloads/mp3.mp3 -i ~/Downloads/4.mp4 -y ~/Downloads/out_bg.mp4
截取音频
ffmpeg -i ~/Downloads/mp3.mp3 -ss 00:00:10.0 -t 00:00:40 -acodec copy ~/Downloads/out_mp3_hight.mp3
