Hello there
I am using a Dell XPS 430 to watch mpeg 4:2:2 feeds, and that is a 7-8 year old pc.
Computer specifications:
CPU. Intel Core 2 Quad Q9450 / 2.66 GHz.
Quad-Core.
4gb 10333 mhz ddr3 ram
Nvidia GTX 660 video card with 2gb ram.
Dvbsky s952 twin tuner video card.
120gb ssd drive.
Dvb software such as dvb dream or progdvb.
Apparently you need at least 4gb ram, a quad core processor and an nvidia video card with at least 2gb onboard ram for mpeg 4:2:2 feeds.
This system is quite old but can display one mpeg 4:2:2 feed quite easily. However it does struggle if I try to record a second feed. However if you only want to watch/record one feed at a time, as el samak says, you don't need a state of the art computer.
Streaming is quite easy via webif and vlc when you know how, so long as you can connect the pc and the receiver via a router.
One other option is to record an mpeg 4:2:2 signal from your receiver onto a usb device, transfer the recording to a computer and check if it will play back via vlc. Some receivers allow you to do this, but of course you can not watch the broadcast live. It might be useful for an event you can not get elsewhere.