How to hardcode subtitle into a video with FFmpeg?

superuser.com/questions/869248/hardcoding-subs-with-ffmpeg
askubuntu.com/questions/485100/how-may-i-burn-srt-subtitles-to-video-with-avconv

On Ubuntu 20.10, just:

ffmpeg -i input.mp4 -vf "subtitles=subtitle.srt" output.mp4

To change font size: stackoverflow.com/questions/21363334/how-to-add-font-size-in-subtitles-in-ffmpeg-video-filter

ffmpeg -i input.mp4 -vf "subtitles=subtitle.srt:force_style='Fontsize=64'" output.mp4

The default appears to be 24, so just multiply that by whatever seems like a reasonable factor.

Note howver that .ass subtitle files can contain style information, which ffmpeg respects. Aegisub can produce and preview such styles, making .ass one of the best options.

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