Individual recording not work

Hi! I have a problem…

  • [Operation details]
    I use sample application (Android version) from source: https://github.com/OpenVidu/openvidu-tutorials/releases/tag/v2.15.0
    I use device A to create SessionA and record with INDIVIDUAL mode. I then use device B to participate in SessionA (SessionA is recording).
  • [Occurrence phenomenon]
    On the screen of device A: device A’s video frame is working properly, device B’s video frame is black.
    On the screen of device B: The video frame of device A and device B works normally.
    On the server there is only video of device A and the video of device B is 0 bytes in size.
  • Environment:
    Device A and device B use Android 10.0
    Openvidu-server
    "VERSION": "2.15.0", "HTTPS_PORT": 443, "OPENVIDU_STREAMS_VIDEO_MAX_RECV_BANDWIDTH": 1000, "OPENVIDU_STREAMS_VIDEO_MIN_RECV_BANDWIDTH": 300, "OPENVIDU_STREAMS_VIDEO_MAX_SEND_BANDWIDTH": 1000, "OPENVIDU_STREAMS_VIDEO_MIN_SEND_BANDWIDTH": 300, "OPENVIDU_SESSIONS_GARBAGE_INTERVAL": 900, "OPENVIDU_SESSIONS_GARBAGE_THRESHOLD": 3600, "OPENVIDU_RECORDING": true, "OPENVIDU_RECORDING_VERSION": "2.15.0", "OPENVIDU_RECORDING_PATH": "/data/record/", "OPENVIDU_RECORDING_PUBLIC_ACCESS": true, "OPENVIDU_RECORDING_NOTIFICATION": "publisher_moderator", "OPENVIDU_RECORDING_CUSTOM_LAYOUT": "/opt/openvidu/custom-layout/", "OPENVIDU_RECORDING_AUTOSTOP_TIMEOUT": 30, "OPENVIDU_WEBHOOK": false.

My question: Why is the video frame of device B black and the video of device B is not recorded on the server?

Thanks all for help!!!