First Person: WebVTT versus TTML

Andreas Tai

Subtitles like half a tweet. Formatting, timing. Used to get transmitted during the vertical blank interval. Europe uses ebu-stl binary format. Timing, alignment. Limited formatting, file size, character sets. Two alternatives, TTML and WebVTT. TTML XML based, supported by broadcasters and video players. WebVTT text based, supported by browser vendors. QC important to broadcasters, so XML. Web more about error handling. (Seems like this could easily have been avoided.)

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