captionData property
Controls the types of data that passes to onCaptionInfo outputs. If set to 'all' then 608 and 708 carried DTVCC data will be passed. If set to 'field1AndField2608' then DTVCC data will be stripped out, but 608 data from both fields will be passed. If set to 'field1608' then only the data carried in 608 from field 1 video will be passed.
Implementation
final RtmpCaptionData? captionData;