Mit ffmpeg lassen sich mit der nachfolgenden Zeile Untertitel zu einem bestehenden Video hinzufügen.

$ ffmpeg -i input.mp4 -i english.srt -i german.srt -map 0 -map 1 -map 2 -c copy -c:s mov_text -metadata:s:s:0 language=eng -metadata:s:s:1 language=deu output.mp4

Dabei bedeuten die jeweiligen Parameter folgendes.

• -i input.mp4: Specifies your input video file.
• -i english.srt: Specifies your English subtitle file.
• -i german.srt: Specifies your German subtitle file.
• -map 0: Maps the video and audio from the first input file (input.mp4).
• -map 1: Maps the subtitles from the second input file (english.srt).
• -map 2: Maps the subtitles from the third input file (german.srt).
• -c copy: Copies the video and audio streams without re-encoding.
• -c:s mov_text: Specifies the codec for subtitles (for MP4 containers, mov_text is commonly used).
• -metadata:s:s:0 language=eng: Sets the language metadata for the first subtitle track to English.
• -metadata:s:s:1 language=deu: Sets the language metadata for the second subtitle track to German.
• output.mp4: The name of your output file with the embedded subtitles.