Table of Contents

ffmpeg - Subtitles - Add multiple subtitles

Add both SRT subtitles

ffmpeg -i input.mp4 -i subtitle.en.srt -i subtitle.chi.srt -map 0 -map 1 -map 2 -c copy -c:s mov_text -metadata:s:s:0 language=eng -metadata:s:s:1 language=chi output_eng_chi.mp4

NOTE: This adds two

Add another SRT subtitle

This assumes that the input file already has a subtitle. 

ffmpeg -i input_english.mp4 -i subtitle.chi.srt -map 0 -map 1 -c copy -c:s mov_text -metadata:s:s:1 language=chi output_chi.mp4

NOTE:

  • -map 0 refers to the video, input_english.mp4, which already contains existing english subtitles.
  • -map 1 refers to the subtitle file, subtitle.chi.srt, to add a different subtitle to the output.

Without -map, ffmpeg will select only one subtitle stream among all inputs.