Log callback interface #91
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This pull request implements a safe interface for setting a log callback and provides a simple default implementation that prints via the
logcrate.It does not change any existing APIs and works on all ffmpeg versions.
It only supports the targets unix and windows but if you know how the varargs parameter looks like on other targets it can be easily extended.
I'm open for discussion about whether this should be behind a feature flag, but I think there aren't any programs out there that don't include log and vsprintf is like 30 LOC.