Break a Leg

FFmpeg 分离音视频，分离左右声道，添加音轨分离音频ffmpeg -i test.mp4 -vn -acodec copy voice.aac准备音轨二ffmpeg -i back.mp4 -vn -acodec copy voice_back.aac分离视频ffmpeg -i test.mp4 –an -vcodec copy video.mp4合并视频ffmpeg -i video.mp4 -i voice.aac -i voice_back.aac -map 0:v -map