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now is the 3rd post

ffmpeg -i video.mp4 -i audio.m4a \
-map_metadata 0 \ # 全局元数据
-map_metadata:s:v 0:s:v \ # 视频流元数据
-map_metadata:s:a 1:s:a \ # 音频流元数据
-map_chapters 0 \ # 保留章节信息(如果有)
-c copy \
-map 0:v:0 -map 1:a:0 \
output.mp4