MythTV
MythTV is an exceptional linux based PVR. It has an interesting and very configurable split frontend/backend architecture.
One traditional use for this split architecture is to put all the mass storage and recording hardware in a box under the stairs and then have a lightweight (and silent) machine plugged into the TV. Encoding video in realtime requires either some pretty powerful CPUs or alternatively dedicated hardware.
Enter DVB-T and a USB dongle to capture DVB mpeg streams.
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