[asterisk-bugs] [JIRA] (ASTERISK-25867) Video delay on app_echo

[Jacek Konieczny (JIRA)]

Jacek Konieczny created ASTERISK-25867:
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             Summary: Video delay on app_echo
                 Key: ASTERISK-25867
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25867
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Applications/app_echo
    Affects Versions: 13.7.2
         Environment: SIPML5 WebRTC client in Firefox or Chrome browser.
            Reporter: Jacek Konieczny


After patching around broken DTLS SRTP for RTCP (ASTERISK-25642) app_echo, started after an audio prompt is played, would still not work correctly. Video would show only after a few minutes, when a new full reference frame is sent.

This is because video frames are forwarded only after all DTLS handshakes are finished and app_echo is started. Any reference frame received earlier would be lost and the caller is not informed about it in any way.

Chrome would send FIR requests immediately, but those would not be forwarded by app_echo. Other clients might not even send the FIR request and expect the reference frame to come on time.

I have made a patch which fixes this behaviour in both cases.



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