====== ffmpeg - Subtitles - Add subtitles from a SRT file ====== ===== Adding Soft Subtitles ===== 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 **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. ---- ===== Adding Hard Subtitles ===== ffmpeg -i input.mp4 -vf subtitles=subtitle.srt output.mp4 **NOTE:** The subtitles will be added to the video using the default font styles. * **-vf** is an alias for **-filter:v**. * **subtitles=subtitle.srt** is the name of the filter followed by the name of the SRT subtitle file. ---- ===== 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. 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 **NOTE:** This will put the subtitles with DejaVu font and size 24 while keeps the quality of the video. ---- ===== References ===== https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes