I have a build of ffmpeg 4.4 with the Blackmagic Design 12.2 SDK included on 
Ubuntu 20.04 and just trying to it to pass 608/ 708 captions embedded in the 
files when playing out the SDI. Trying mpeg-2/ts and mxf. Here are some short 
sample files:

https://www.dropbox.com/s/b0lufj69tyitcbn/1080iSampleFileCC.mpg?dl=0

https://www.dropbox.com/s/ujyna1dx3bhs7p4/720ts_6DK01H_tru720og.ts?dl=0

https://www.dropbox.com/s/jrhzd7kkjfh7kyb/1080mxf_708_I28706.mxf?dl=0

Have tried these lines, they all play fine out the SDI but no captions show:

ffmpeg -i /home/matt/VideoTests/1080i_PS_SampleFileCC.mpg -codec:v mpeg2video 
-cc_stream_map "ccgroup:cc,instreamid:CC1,language:en" -f decklink -a53cc 
boolean -map 0 -vcodec v210 "DeckLink SDI 4K"

ffmpeg -i /home/matt/VideoTests/1080i_PS_SampleFileCC.mpg -pix_fmt uyvy422 -f 
decklink -a53cc boolean -map 0 -vcodec v210 "DeckLink SDI 4K"

ffmpeg -i /home/matt/VideoTests/1080i_PS_SampleFileCC.mpg -codec:v mpeg2video 
-cc_stream_map "ccgroup:cc,instreamid:CC1,language:en" -pix_fmt uyvy422 -f 
decklink -a53cc boolean -map 0 -vcodec v210 "DeckLink SDI 4K"

ffmpeg -i /home/matt/VideoTests/1080i_PS_SampleFileCC.mpg -codec:v mpeg2video 
-cc_stream_map "ccgroup:cc,instreamid:CC1,language:en" -f decklink -a53cc 
boolean -map 0 -vcodec v210 "DeckLink SDI 4K"


Anyone know what I am doing wrong or have any tips? Thanks!

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