Captions the viewer can turn on or off. Open captions are burned into the picture and cannot be switched off.
Also called: CC, open captions, burned-in captions
Closed captions ride in a separate track. The player draws them. The viewer can hide them, change the size, or pick another language. Open captions are pixels in the video. They survive a mute, and they also survive every export, whether you want them or not.
YouTube's CC button reads a closed track. A thumbnail or a Short with words painted on the picture is using open captions for those words.
An extractor can only read a closed track. Burned-in words are part of the image. No caption endpoint will return them. If a video has open captions and no closed track, the honest transcript tool returns a miss.
If you need those words, you either type them or run optical character recognition on frames. That is outside what a caption extractor does.
Captions the viewer can turn on or off. Open captions are burned into the picture and cannot be switched off.
Closed captions ride in a separate track. The player draws them. The viewer can hide them, change the size, or pick another language. Open captions are pixels in the video. They survive a mute, and they also survive every export, whether you want them or not.
Start with transcript-generator, subtitle-downloader.