Here are some short files with embedded 608/708 is anyone needs…
Also getting the Decklink to output captions can be a task…
With the Blackmagic DeckLink SDK 12.2 The Win\Samples\bin\ClosedCaptions.exe sample does not have a input file choice or anything, just puts a blue screen and the SDI Monitor shows:
“CEA-708 Closed Captions
Second line of text!” - as captions on the monitor.
Another place to maybe look at getting captions out is with the Medialooks MFormats SDK This is a paid SDK but can demo to get ideas maybe… This works for playing a file with embedded captions and it will output to the decklink SDI, playing audio/ video and 708… Medialooks\MFormats SDK\Samples\C#\Sample File Playback\bin\x64\Debug> Sample File Playback.exe …there are also some C ++ samples too.