avfilter/framesync: add a new option to set how to sync streams based on secondary input timestamps
Include two values for it, a default one that sets/keeps the current behavior, where the frame event generated by the primary input will have a timestamp equal or higher than frames in secondary input, plus a new one where the secondary input frame will be that with the absolute closest timestamp to that of the frame event one. Addresses ticket #9689, where the new optional behavior produces better frame syncronization. Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: James Almer <jamrial@gmail.com>
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