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Why burned in rather than a track you can toggle

A separate subtitle track is the better technology where it is supported: it can be switched off, translated, and styled by the player. The trouble is that most social platforms never show one at all, so a caption sitting in a track nobody renders helps nobody. The [msm_tool slug="video-subtitles"] draws each line directly onto the frames it belongs to instead, and encodes the video once with the words already part of the picture — which is why they show up in a muted feed, in a player with no subtitle button, and after the clip has been downloaded and reposted somewhere else entirely.

It will not listen to the video for you

Turning speech into text needs a model far larger than a browser can load, so the words have to come from an SRT or VTT file, or be typed by hand in the same shape: a timestamp line, an arrow, an end time, then the words. Both a comma and a full stop are accepted before the milliseconds, since different tools export the format slightly differently.

The outline is not a style choice

Every line is drawn with an outline regardless of what else is set, because plain white text disappears the moment the footage behind it turns pale — the ordinary reason a burnt-in caption becomes unreadable. The outline costs nothing to render and holds up over any background, which is the point of it not being optional.

Size for the phone it will actually be watched on

Feed video autoplays muted on almost every platform, which makes a caption the content rather than an accessibility extra — if a clip depends on its audio to make sense, most people who see it never hear it. Text that looks generously sized on an editing monitor reads small on a handset held at arm's length, so the large setting is usually the right call even though it looks oversized while you are working on it.

What a caption running past the end is telling you

A warning that the last caption ends after the video does almost always means the timing file was written for a different cut of the footage — a version before it was trimmed, or a different export entirely. The line stating when the final caption lands is worth checking against the video's actual length before encoding.

Once it is burned in, it stays

There is no undo for this the way there is for a subtitle track: the captions become part of the picture and cannot be hidden or translated afterwards. Keep the original video file and the subtitle file separately, since running this a second time on the burnt-in output would draw a fresh layer of text over the first.