I am working with a web application using Node.js and Express, and I display a video with some subtitles generated dynamically. I was wondering if there was a way to integrate this subtitles in the video so that the user could download this new video.
2 Answers
Probably not.
As you said, the subtitles are dynamic and are not 'baked' into the video. You'd have to re-render the video with the subtitles in order to ship them together.
A solution might be to zip the video alongside with a subtitle file (.srt) so that the user can view them with a video player like VLC. This also gives you the option to add multiple languages for example.
You'd need to transcode/transmux the video in ffmpeg or some other tool. Ideally you'd create your subtitles in SRT or webvtt format, then add them to the video file: ffmpeg -i video.mp4 -i subtitles.srt -c copy video_with_subtitles.mp4. Or you could "burn" them into the video, but that's usually not the preferred experience.
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