Originally Posted by peternagy
That's partially correct. But DVR cable box (or other external sources if supported) can "trick" HDMI by overlaying CC text onto video signal as if it behaves like subtitles (or SDH) and transmit to TV via any digital cable like HDMI, DVI or even component. HDMI does not care what goes on the video signal. What HDMI does not support is the ability to "decode" CC using line 21.
Right. Why can't HDMI be CC in using Line 21. I have my HDMI cable for my Blu-Ray player in using SHD and subtitle. This subtitle is very clearer and no background box than yellow blurr text in using DVD player.