AVS Forum Special Member
Join Date: Dec 2007
Location: Vancouver, Canada
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That information isn't sent over HDMI, in fact HDMI doesn't have any support for captioning at all.
What you're wanting can only be accomplished by recording the original DVB data, not the decoded HDMI display. Not possible with this card.
LG B7 (OLED65B7P, 2017 -- bought 2017/05/31 & I couldn't be happier so far!) | Panasonic CX850 (TC-55CX850U, 2015 -- bought OLED to replace it due to poor off-angle, weird HDR colors, etc.)
UHD: Philips BDP7501 | HD: PS3, WD TV Live
Denon AVR-890 (2009)