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--- ffmpeg:subtitles:add_subtitles_from_another_file [2024/12/30 19:30] – created peter
+++ ffmpeg:subtitles:add_subtitles_from_another_file [2024/12/30 19:37] (current) – peter
@@ Line 1: / Line 1: @@
 ====== ffmpeg - Subtitles - Add subtitles from another file ======
-Assuming a.mkv contains only the **video** and **audio**, but b.mkv contains **subtitle** data to be included.
+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>