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ffmpeg - Subtitles

ffmpeg supports both hard subtitles and soft subtitles.

Hard Subtitles are subtitles that are hard coded to a video and are burned into the video and cannot be removed once they have been added.
Soft Subtitles are not burned into a video. They can be enabled and disabled during the video playback. This gives users more flexibility and more control over how they want to watch the video.