zvbi-atsc-cc device node conflict

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I'm using a HVR-1850 in digital mode and get good picture and sound using

 mplayer -autosync 30 -cache 2048 dvb://KCAL-DT

Closed captioning works flawlessly with this command:

zvbi-atsc-cc -C test-cc.txt KCAL-DT

However, if I try to run both at the same time, I get a device node conflict:

zvbi-atsc-cc: Cannot open '/dev/dvb/adapter0/frontend0': Device or resource busy.

How do I get video and closed captioning at the same time?

Cheers,
Dave

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