transcode.

if something similar is needed for audio filter2 ... I don't think it
is)

code from ILEoo (not sure what this actually does)

Patch by Rov Juvano. thanks.

This removes dummy wakeups, and fixes a deadlock when quitting while
reading from a FIFO.

to produce well-formed pkg-config files.

Require it in configure as well.

This seems to solve the invalid handle problem, as pointed out by
Laurent. However, I get a poststamp-sized video output now...