Found 2 packages
A teletext subtitle decoder, in C# targetting NET standard 2.0
A .NET 9 C# library for parsing and extracting data from MXF (Material Exchange Format), extracted data streams, VBI (Vertical Blanking Interval), T42 (Teletext packet stream), and MPEG-TS (Transport Stream) files, with SMPTE timecode and Teletext caption support (OP-42 & OP-47 in particular).