使用rtspclient读取rtsp流中时间戳突变的问题

[lifeibin]

您好，我在使用rtspclient的过程中发现了一个很奇怪的问题，想请教一下应该怎么解决？
我使用easyrtspclient这个so去解析easypusher推到easydarwin上的rtsp流，打印每一帧视频帧的时间戳，发现一旦递增到了一定的值，时间戳就会发生突变，然后继续递增。我打印出来的日志如下：在22:30:45时候，时间戳发生了变化
22:30:44 [ 2993:BAS] the timestamp is:1569335444781
22:30:44 [ 2993:BAS] the timestamp is:1569335444859
22:30:44 [ 2993:BAS] the timestamp is:1569335444962
22:30:44 [ 2993:BAS] the timestamp is:1569335444999
22:30:44 [ 2993:BAS] the timestamp is:1569335445067
22:30:44 [ 2993:BAS] the timestamp is:1569335445153
22:30:44 [ 2993:BAS] the timestamp is:1569335445200
22:30:45 [ 2993:BAS] the timestamp is:1569335445275
22:30:45 [ 2993:BAS] the timestamp is:1569335445353
22:30:45 [ 2993:BAS] the timestamp is:1569335445414
22:30:45 [ 2993:BAS] the timestamp is:1569335445493
22:30:45 [ 2993:BAS] the timestamp is:1569318668356
22:30:45 [ 2993:BAS] the timestamp is:1569318668404
22:30:45 [ 2993:BAS] the timestamp is:1569318668479
22:30:45 [ 2993:BAS] the timestamp is:1569318668572
22:30:45 [ 2993:BAS] the timestamp is:1569318668615
22:30:45 [ 2993:BAS] the timestamp is:1569318668688
22:30:45 [ 2993:BAS] the timestamp is:1569318668770
22:30:45 [ 2993:BAS] the timestamp is:1569318668832
22:30:45 [ 2993:BAS] the timestamp is:1569318668902
22:30:45 [ 2993:BAS] the timestamp is:1569318668979
想请问一下这是怎么造成的，应该怎么解决呢？