FFmpeg提取第一个视频合并第二个视频的音频同时加2个水印

ffmpeg -i ~/Movies/objectC/facebook.mp4 -i ~/Movies/rangzidanfei.mkv -i ~/Pictures/SACC.jpg -i ~/Pictures/IMG_8678.JPG -filter_complex "[2:v] scale=30:30 [wm1]; [3:v] scale=20:20 [wm2]; [0:v][wm1] ove

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