Anyone know how to get Closed Captioning (CC) to work on HDTV programs recorded via firewire?

I am (mostly) successfully recording via firewire to a Motorola 6200, but have been asked to enable Closed Captioning.

Thanks in advance.

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ECS 741GX-M Rev 1.0A
SIS chipset
(GQ3131 aka Fry's $99 special)
Semperon 2200
1G RAM
Nvidia FX-5200 svideo out
Hauppauge WinTV PVR-500 MCE (Phillips)
200GB ST3200822A Disk
40GB WDC WD400BB-22JHC0
BTC 9019URF Wireless Keyboard/Mouse

I'm on R5D1 and CC works fine on recordings captured from the Motorola 6200 box over firewire. You need to enable capturing of the CC data in the "general" section of myth setup. Myth setup is accessed by hitting ALT-s on your keyboard. I don't remember exactly which setting it is, but it's titled something like "NTSC VBI", if memory serves me correctly.

On playback, turn on CC playback. This can be enabled from the playback menu or by hitting the letter T.

Marc