CSharp version of telxcc (from https://github.com/debackerl/telxcc)
telxcc-sharp is a utility for extracting teletext Closed Captions from Transport Streams (.ts/.m2ts) into .srt text files.
Compile with .NET Core 3 - should work on Windows/Linux/Mac.
TelxCCSharp -p 888 -i file1.ts -o sub.srt ↵
Feel free to open an issue - do remember to include a sample file (as a .zip archive).