Michael Niedermayer 3182114f88 avutil/log: Add av_log_once() for printing a message just once with a high log level ...

Compared to ad-hoc if(printed) ... code this allows the user to disable
it by adjusting the log level

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

2020-02-12 10:25:25 +01:00

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