GB28181: Always enable jitter for RTP. (#2647) 导致视频播放卡顿，退出以后正常 #2821

[winlinvip]

描述(Description)

摄像头实时视频卡，测试发现退掉下面这个commit以后视频就正常播放
Commit 3505a85e
GB28181: Always enable jitter for RTP. (#2647)

描述你遇到了什么问题(Please description your issue here)

1. SRS版本(Version):

feature/gb28181
commit 72ad526

1. SRS的日志如下(Log):

[2021-12-27 11:18:51.771][Warn][29280][949461ix][11] RTP: jitbuffer NACK list has grown too large: 275 > 250
[2021-12-27 11:18:51.771][Warn][29280][949461ix][11] RTP: jitbuffer key(32010000001110000001@32010000001310000001) requesting key frame due to too large NACK list.
[2021-12-27 11:18:52.010][Warn][29280][949461ix][11] RTP: jitbuffer NACK list contains too old sequence numbers: 451 > 450
[2021-12-27 11:18:52.010][Warn][29280][949461ix][11] RTP: jitbuffer key(32010000001110000001@32010000001310000001) requesting key frame due to missing too old packets
[2021-12-27 11:18:52.131][Warn][29280][949461ix][11] RTP: jitbuffer NACK list has grown too large: 258 > 250
[2021-12-27 11:18:52.131][Warn][29280][949461ix][11] RTP: jitbuffer key(32010000001110000001@32010000001310000001) requesting key frame due to too large NACK list.
[2021-12-27 11:18:52.418][Warn][29280][949461ix][11] RTP: jitbuffer NACK list has grown too large: 266 > 250
[2021-12-27 11:18:52.419][Warn][29280][949461ix][11] RTP: jitbuffer key(32010000001110000001@32010000001310000001) requesting key frame due to too large NACK list.
[2021-12-27 11:18:52.493][Warn][29280][949461ix][11] RTP: jitbuffer NACK list contains too old sequence numbers: 451 > 450
[2021-12-27 11:18:52.493][Warn][29280][949461ix][11] RTP: jitbuffer key(32010000001110000001@32010000001310000001) requesting key frame due to missing too old packets

1. SRS的配置如下(Config):
   push.gb28181.txt
   重现(Replay)

重现Bug的步骤(How to replay bug?)

1. xxxxxx
2. xxxxxx
3. xxxxxx

期望行为(Expect)

描述你期望发生的事情(Please describe your expectation)