ffmpeg 画中画示例

ffmpeg -i back.png -i 2.mp4 -i 1.mov -i 17colorlogo.png -filter_complex 
"[0:v]scale=720:-1[a];
[1:v]crop=720:498,scale=720:-1[d];
[a][d]overlay=0:250[b];
[2:v]scale=1280:-1,crop=720:534[c];
[b][c]overlay=0:1280-overlay_h[t];
[3]scale=155:-1[logo_0];
[t][logo_0]overlay=40:45,
drawtext=fontfile='HeitiSC':fontcolor=white:fontsize=16:borderw=1:bordercolor=black@0.5:text='测试':x=10:y=h-text_h-10,
drawtext=fontfile='HeitiSC':fontcolor=white:fontsize=16:borderw=1:bordercolor=black@0.5:text='测试':x=w-text_w-10:y=h-text_h-10,
drawtext=fontfile='HeitiSC':fontcolor=white:fontsize=50:borderw=1:bordercolor=black@0.5:text='测试':x=(720-text_w)/2:y=120,
drawtext=fontfile='HeitiSC':fontcolor=white:fontsize=50:borderw=1:bordercolor=black@0.5:text='测试':x=(720-text_w)/2:y=185,
subtitles=1.srt:force_style='Alignment=2,MarginV=100,Fontsize=8,Fontname=HeitiSC'" -y out.mp4