best way to flush data in sink/queue

[Tim Müller]

In case it wasn't clear from my explanation, the difference between
max-lateness and ts-offset is that the ts-offset is applied
unconditionally and changes the actual output position for all buffers,
whereas max-lateness only allows some slack for late buffers (which
will then be rendered asap).

-- 
Tim Müller, Centricular Ltd - http://www.centricular.com

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