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--- ffmpeg:subtitles:add_subtitles_from_a_srt_file [2024/12/30 19:55] – created peter
+++ ffmpeg:subtitles:add_subtitles_from_a_srt_file [2024/12/30 22:10] (current) – peter
@@ Line 1: / Line 1: @@
 ====== ffmpeg - Subtitles - Add subtitles from a SRT file ======
+===== Adding Soft Subtitles =====
+<code bash>
+ffmpeg -i input.mp4 -i subtitle.srt -c copy -c:s mov_text -metadata:s:s:0 language=eng output.mp4
+ffmpeg -i input.mp4 -i subtitle.srt -c copy -c:s srt -metadata:s:s:0 language=eng output.mkv
+</code>
+<WRAP info>
+**NOTE:** Different syntax is used for MP4 and MKV.
+  * **-c** copy specifies that the video is not to be re-encoded.
+  * **-c:s mov_text** sets the SRT file to MOV_TEXT format.
+  * **-c:s srt** sets the SRT file to SRT format for MKV.
+  * **-metadata:s:s:0** means to set the metadata for Stream:Subtitle:Number of stream, starting with 0.
+  * **language=eng** sets the subtitle language to English.
+    * The value for this option uses the [[https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes|ISO 639]] language code which consists of 3 letters for every language.
+</WRAP>
+----
+===== Adding Hard Subtitles =====
 <code bash>
@@ Line 12: / Line 36: @@
 </WRAP>
+----
+===== Adding Soft Subtitles with additional formatting =====
+Use a SRT subtitle file and change the size of the font by putting ASS style format **KEY=VALUE** pairs separated by a comma.
+<code bash>
+ffmpeg -i input.mp4 -vf subtitles=sub.srt:force_style='FontName=DejaVu Serif,FontSize=24' -vcodec libx264 -acodec copy -q:v 0 -q:a 0 output.mp4
+</code>
+<WRAP info>
+**NOTE:**  This will put the subtitles with DejaVu font and size 24 while keeps the quality of the video.
+</WRAP>
+----
+===== References =====
+https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes