====== ffmpeg - Subtitles - Add subtitles from another file ======

Assuming

  * a.mkv contains only the **video** and **audio**.
  * b.mkv contains some **subtitle** data to be included

<code bash>
ffmpeg -i a.mkv -i b.mkv -c:v copy -c:a copy -c:s copy -map 0:0 -map 0:1 -map 1:2 -y out.mkv
</code>

<WRAP info>
**NOTE:**  The mapping syntax is:

  * **0:0** refers to stream 0 from file 0 (the first file, which is a.mkv).
  * **0:1** refers to stream 1 from file 0 (the first file, which is a.mkv).
  * **1:2** refers to stream 2 from file 1 (the second file, which is b.mkv).


To determine the mapping for the subtitle, run:

<code bash>
ffmpeg -i b.mkv
</code>

and see which stream contains the **subtitle** data.

</WRAP>