[mythtv] mythtranscode --showprogress

[Chris Petersen]

> You should be able to check the value of $? after the pipe has been closed.

Yeah, silly me.  I should have known that (looked it up just after I 
sent that last email).  Now it's a matter of getting that data back to 
the parent process in an easy way.

Anyway, looks like we're well on our way to having a viable 
non-interactive solution to this stuff.

-Chris