TtmlDocument Field Type Repeated Description text string Raw (xml) text of the TTML document mediatime uint64 Media time (units of 100 microseconds) Member of Message Description InspectSubtitlesChunk A chunk of subtitling text, not necessarily representing a formatted cue as will be displayed in the output StreamSubtitlesInputTtml Send a TTML cue as a full TTML document (may be a single cue/ISD or a segment consisting of multiple) TsProgram.TsPid UdpTsInputConfiguration