Originally Posted By: Phil.
We have no OTA free HD content here (at least nothing that's commonly available).

You must not be in mainland USA, or even Canada then. Probably in the UK(?). HDTV standards may differ there.

Quote:
I see that the US shops sell HDTV cards - are they doing all their work in hardware?

They don't have any work to do. The HD broadcast simply arrives as a pre-encoded MPEG2 stream with 5.1 surround sound, all encoded. Recording is literally as simple as cat /dev/decoder > /var/saved_this_broadcast.mpg, and takes less than 1% of pretty much any CPU.

-ml