That's quite different from the said burn-in subtitles which have no requirement for subtitle plugins and are there for good.
You may experience distorted/missing subtitles issues. This may render some out-of-sync problems. Sounds good? Sadly, there are lots of reasons why you still need to hardcode subtitles to MP4 or other videos: By doing this, you can get options to toggle the subtitles on or off, adjust how it appears on the video on the displayed media players.
You can softcode subtitles as extra streams of the media file. Hardcode subtitles, also known as, 'burned-in subtitles, or forced subtitles', means burning the subtitle stream onto the video, so the subtitles become part of the video which can be viewed without the requirement for subtitle plugins.
To add and burn-in subtitles to any videos, VideoProc Vlogger is a free and easy way. Summary: Want to hardcode subtitles to your MP4, MKV or other video files? The post will offer you 3 ways to do it such that you can enjoy movies and videos with subtitles on different players and devices.