Decklink teletext to webVTT

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Decklink teletext to webVTT

vmm2017
I have a broadcast source with "CC" I am using decklink mini recorder.
When I do command as follows:

ffmpeg -f decklink -format_code Hi59 -teletext_lines all -i 'DeckLink Mini
Recorder'

Input #0, decklink, from 'DeckLink Mini Recorder':
  Duration: N/A, start: 0.000000, bitrate: 995869 kb/s
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    Stream #0:1: Video: rawvideo (UYVY / 0x59565955), uyvy422(top first),
1920x1080, 994333 kb/s, 29.97 tbr, 1000k tbn, 1000k tbc
    Stream #0:2: Subtitle: dvb_teletext, 492x250

How do I build a pipline to convert dvb_teletext to webVTT ?

Please help.




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