Carry the chroma location through the filter graph the way the other video
color properties already are. The decoder's value reaches buffersrc, the
encoder's accepted list reaches the sink, and the graph converts between
them.
This also makes an explicit -chroma_sample_location do something useful on
the output side. It used to only tag, and warn when the tag disagreed with
the frame, which is why the warning goes away here.
Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
02abeae2c7