====== ffmpeg - Audio - Add audio to a video file ======

Adding an audio file to a video is achieved with mapping.

  * Video files can contain more than just a video and audio stream, they can have multiple audio streams for different language as well as subtitle files.
  * Mapping for a video stream also contains the different quality and bitrate options.

----

===== Example =====

<code bash>
ffmpeg -i video.mp4 -i audio.mp3 -c copy -map 0:v:0 -map 1:a:0 output.mp4
</code>

<WRAP info>
**NOTE:**  This maps the video to the first video stream of the output (default) and the audio onto the first audio stream in the output file.

  * This command copies the two files into one without any compressing;
  * If one file is longer than the other use **-shortest** which finishes the encoding when the shortest stream ends.

</WRAP>