Streaming to Facebook, lost around 40sec

[CasperMok]

For 1/2 out of 10 streamings to Facebook, there is around 40 sec short of video on what being seen on Facebook than what expected. Here are the tests we have done. FYI, Facebook uses RTMPS.

iPhone XS, iOS 13.4
Streaming to Facebook
1: 3:30 app/ 3:09 Facebook / 0:21 difference
2: 3:30 app/ 3:18 Facebook / 0:12 difference
3: 3:00 app/ 2:40 Facebook / 0:20 difference
4: 6:10 app/ 5:59 Facebook / 0:11 difference
5: 2:00 app/ 1:12 Facebook / 0:48 difference
6: 4:30 app/ 4:17 Facebook / 0:13 difference
7: 3:00 app/ 2:57 Facebook / 0:03 difference
8: 3:50 app/ 3:44 Facebook / 0:06 difference
9: 2:30 app/ 2:27 Facebook / 0:03 difference
10: 3:30 app/ 3:27 Facebook / 0:03 difference

iPhone 6s, iOS 11
Streaming to Facebook
1: 3:30 app/ 3:25 Facebook / 0:05 difference
2: 3:32 app/ 3:29 Facebook / 0:03 difference
3: 3:00 app/ 2:57 Facebook / 0:03 difference
4: 2:15 app/ 1:31 Facebook / 0:44 difference
5: 2:00 app/ 1:14 Facebook / 0:46 difference
6: 4:32 app/ 4:08 Facebook / 0:24 difference
7: 3:00 app/ 2:45 Facebook / 0:15 difference
8: 4:50app/ 4:48 Facebook / 0:02 difference
9: 2:30 app/ 2:09 Facebook / 0:21 difference
10: 3:30 app/ 3:27 Facebook / 0:03 difference