I have a Knoppmyth box with simply an NTSC tuner card. I want to upgrade to HD. The issue is I already have an ATSC/QAM box (not a PCI card but independent box) that can received the signal. It has many type of outputs on the back.

The question is what do I need to run it into the Myth box? Do I still need an HDTV tuner card or is there another type of card that can accept the signal? Ie. Fancy video card with input

Thanks.

Unless the STB has FireWire, you really don't want to try to record this. I don't think you can (affordable hardware) and if you could, it takes more horsepower than you have. The video comes out of the box fully decoded, and you'd be re-encoding it. That takes too much bandwidth and processing power.

You want to simply add an HD tuner (ATSC and/or QAM) to your box. The Air2PC 5000 is currently the top card, but I have even better luck with the older PCHD3000 and KWorld 110. You can find deals on the KWorld - mine was about $38, but needed a little tweaking (search the forums here) to get it working on R5E50.
These tuners take the already-encoded stream and dump it to disk. This only takes 5% CPU load to do. No encoding necessary. The hard part is in the playback, where you need a 3000Ghz equivalent processor and nVidia 5200 or better. See the writeup on nVidia fixes for R5E50 by mrfarenheight for a fix that helps with xorg performance.

3000GHz? Is that like 1.21 Gigawatts? /backtothefuture

Sorry Thornsoft, couldn't resist.

Martian

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ABIT NF-M2 nView | Athlon 64 X2 3800+ | 2GB DDR2 800 | HDHomerun | GeForce 6150 (onboard) | WD 640 GB SATA HD | DVD-RW (sata) | StreamZap IR receiver with Logitech Harmony remote

Vizio 37" LCD HDTV (1080p)

Great Scott! My kids just discovered that series, and that's all I've been hearing for weeks now. My 8-year-old is getting the trilogy for his birthday - it's on its way from Amazon.com right now.

Anyway, yes. 3.0 Ghz equivalent, such as AMD64 3200, seems to be the baseline for simultaneous HD record/playback.