使用kurento视频在几秒后卡死记录

使用kurento进行视频通话的时候，手机端的视频会在几秒后卡主。
错误日志如下

2020-09-17 20:02:38,622262 28868 [0x00007f9902ffd700]   debug rtpjitterbuffer           gstrtpjitterbuffer.c:1510 gst_rtp_jitter_buffer_src_event() <rtpjitterbuffer0>  received custom-upstream
2020-09-17 20:02:38,622317 28868 [0x00007f9902ffd700]   debug agnosticbin               kmsagnosticbin.c:969 kms_agnostic_bin2_src_reconfigure_probe() <kmsagnosticbin2-1:src_0>  Received reconfigure event
2020-09-17 20:02:38,622334 28868 [0x00007f9902ffd700]   debug agnosticbin               kmsagnosticbin.c:754 kms_agnostic_bin2_process_pad() <kmsagnosticbin2-1>  Processing pad: <kmsagnosticbin2-1:src_0>
2020-09-17 20:02:38,622350 28868 [0x00007f9902ffd700]    info agnosticbin               kmsagnosticbin.c:708 kms_agnostic_bin2_link_pad() <kmsagnosticbin2-1>  Linking: <kmsagnosticbin2-1:src_0>
2020-09-17 20:02:38,622370 28868 [0x00007f9902ffd700]   debug agnosticbin               kmsagnosticbin.c:716 kms_agnostic_bin2_link_pad()  Query caps are: video/x-vp8
2020-09-17 20:02:38,622451 28868 [0x00007f9902ffd700]   debug agnosticbin               kmsagnosticbin.c:204 remove_on_unlinked_blocked() <tee4:src_2>  Unlinking pad
2020-09-17 20:02:38,622576 28868 [0x00007f9902ffd700]   debug rtpjitterbuffer           gstrtpjitterbuffer.c:1510 gst_rtp_jitter_buffer_src_event() <rtpjitterbuffer0>  received custom-upstream
2020-09-17 20:02:38,632013 28868 [0x00007f995cfd0700] warning srtpdec                   gstsrtpdec.c:1149 gst_srtp_dec_decode_buffer() <srtp-decoder:rtp_sink>  Unable to unprotect buffer (unprotect failed code 9)
2020-09-17 20:02:38,632053 28868 [0x00007f995cfd0700] warning srtpdec                   gstsrtpdec.c:1178 gst_srtp_dec_decode_buffer() <srtp-decoder>  Other error, dropping
2020-09-17 20:02:38,637366 28868 [0x00007f995cfd0700]   debug rtpjitterbuffer           gstrtpjitterbuffer.c:2504 gst_rtp_jitter_buffer_chain() <rtpjitterbuffer0>  Received packet #14926 at time 0:00:07.077516724, discont 0
2020-09-17 20:02:38,637396 28868 [0x00007f995cfd0700]   debug rtpjitterbuffer           gstrtpjitterbuffer.c:2584 gst_rtp_jitter_buffer_chain() <rtpjitterbuffer0>  expected #14926, got #14926, gap of 0
2020-09-17 20:02:38,637410 28868 [0x00007f995cfd0700]   debug rtpjitterbuffer           gstrtpjitterbuffer.c:2713 gst_rtp_jitter_buffer_chain() <rtpjitterbuffer0>  Clearing gap packets
2020-09-17 20:02:38,637423 28868 [0x00007f995cfd0700]   debug rtpjitterbuffer           rtpjitterbuffer.c:457 calculate_skew()  extrtp 1287913942, gstrtp 3:58:30.154911111, base 3:58:24.712911111, send_diff 0:00:05.442000000
2020-09-17 20:02:38,637437 28868 [0x00007f995cfd0700]   debug rtpjitterbuffer           rtpjitterbuffer.c:612 calculate_skew()  skew 0, out 0:00:07.096150851
2020-09-17 20:02:38,637449 28868 [0x00007f995cfd0700]   debug rtpjitterbuffer           gstrtpjitterbuffer.c:2050 update_timers() <rtpjitterbuffer0>  0, 0, #14924<->#14926 gap 2
2020-09-17 20:02:38,637462 28868 [0x00007f995cfd0700]   debug rtpjitterbuffer           gstrtpjitterbuffer.c:2809 gst_rtp_jitter_buffer_chain() <rtpjitterbuffer0>  Pushed packet #14926, now 2 packets, head: 0, percent -1

libSRTP error code 9 (source code) 表示已**用于重放攻击的自动检测（和预防）机制，并且libSRTP库已丢弃该数据包。
这个错误在kurento 6.12.0版本中被正式修复。
只需要升级到6.12.0即可
相关链接
https://github.com/Kurento/bugtracker/issues/246
https://groups.google.com/g/kurento/c/cKzgDVrAch4/discussion

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