osx - AVPlayer seekToTime -


i using periodictimeobserverforinterval update plot reflect current audio waveform. works great , has been giving me no trouble. stays in sync pausing , starting. however, when tried introduce arbitrary seeking code, waveform visual becomes out of sync playing audio. doesn't make sense me unless time sent observer wrong after calling seek function.

            // timescale = 22050 = samplerate             let timescale = self.player.currentitem.asset.duration.timescale;              self.player.seektotime(cmtimemakewithseconds(float64(time), timescale), tolerancebefore: kcmtimezero, toleranceafter: kcmtimezero, completionhandler: {                 (bool) -> void in                 self.player.play();             });

i can't figure out why function causing visual out of sync.


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