[smith288]

Not if you output to the tv card from the DirectTV tuner.

Not as convenient, but still possible.

[E. Pluribus Unum]

Not if you output to the tv card from the DirectTV tuner.

Then you can only record the one channel that the tuner is tuned to.

The purpose of MythTV is to have multiple tuners and program it to automatically record different shows at different times on different channels.

Yes, it will work, but you miss 99% of the functionality.