[_player seekToTime:startTime];
将上述方法替换为下面的方法
[_player seekToTime:startTime toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero];
[_player seekToTime:startTime];
将上述方法替换为下面的方法
[_player seekToTime:startTime toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero];