avcodec/ccaption_dec: Make real-time latency configurable
Un-hardcode the 200ms minimum latency between emitting subtitle events so that those that wish to receive a subtitle event for every screen change could do so. The problem with delaying realtime output by any amount is that it is unknown when the next byte pair that would trigger output will happen. It may be within 200ms, or it may be several seconds later -- that's not realtime at all.
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