FFmpeg: Speed up compile and FATE tests

[peter_b]

1) FFmpeg build:
By default, FFmpeg compiles/builds using only a single thread.
In order to speed this up, one can run make in parallel mode.

Single threading:

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$ ./configure && make clean && make

Parallel mode:

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$ ./configure && make clean && make -k -j6

"-j" = "-jobs".
"-j6" runs 6 build jobs in parallel.
See: GNU Make Manual: Parallel Execution


2) Run FATE tests:

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$ make -k -j6 fate

The speed-gain is tremendous