WEBVTT - English captions for sample-720p-h264-aac.mp4 NOTE 1. The header. A WebVTT file must start with the word WEBVTT, optionally after a byte order mark. Text after a space on the same line is ignored. Free sample WebVTT file from 99helpers.com/file-types/vtt, encoded as UTF-8, as WebVTT requires. NOTE 2. A cue. An optional identifier (here "intro"), the timing line, then one or more lines of text, ended by a blank line. Timestamps use a full stop before the milliseconds, not a comma. NOTE 3. Cue settings. "line:60%" puts the top of each cue at 60% of the picture height. Without it, captions sit at the bottom and would cover the label band burned into this video. intro 00:00:00.000 --> 00:00:01.900 line:60% Free sample WebVTT file from 99helpers.com/file-types/vtt NOTE 4. Captions describe sounds as well as speech, for viewers who can't hear the audio. Square brackets are the usual convention. tone 00:00:02.000 --> 00:00:03.900 line:60% [Steady tone: 440 Hz left, 660 Hz right] NOTE 5. Hours are optional: 00:04.000 means 4 seconds. bars 00:04.000 --> 00:05.900 line:60% Colour bars: red, green, yellow, blue, magenta and cyan. NOTE 6. Simple tags work as in SRT: italic, bold and underline. beep 00:00:06.000 --> 00:00:07.500 line:60% [Beep] A white square flashes at the start of every second. clock 00:00:07.600 --> 00:00:08.950 line:60% The clock at the top counts 30 frames every second. NOTE 7. The last cue ends at 10 seconds, when the video ends. end 00:00:09.000 --> 00:00:10.000 line:60% End of the 10-second sample.