利用ffmpeg合并(mux)已下载的youtube高清视频与音频文件

1. 分别下载1080p以上的高清视频及其音频

2.安装ffmpeg

3.muxing

ffmpeg -i input_video.mp4 -i input_audio.mp4 -c copy -map 0:v:0 -map 1:a:0 -shortest output.mp4

 

• -map 0:v:0 can be translated as: from the first input (0), select video stream type (v), first video stream (0)
• -map 1:a:0 can be translated as: from the second input (1), select audio stream type (a), first audio stream (0)

• With -c copy the streams will be stream copied, not re-encoded, so there will be no quality loss. If you want to re-encode, see FFmpeg Wiki: H.264 Encoding Guide.
• The -shortest option will cause the output duration to match the duration of the shortest input stream.
• See the -map option documentation for more info.

 

REFER: http://stackoverflow.com/questions/12938581/ffmpeg-mux-video-and-audio-from-another-video-mapping-issue