If the video is hosted on a site which requires the caption in a .srt, .vtt, or, .sbv file, you can download the caption file in YouTube.
Os bydd y fideo’n byw ar safle sy’n gofyn am gael capsiynau mewn ffeil .srt, .vtt, neu .sbv, gallwch lawrlwytho’r ffeil capsiynau yn YouTube.