Android SDK Sample App receive video failed

I installed self-hosting server on GCP.
But, android sdk sample app cannot play video from remote client.
Below is the my test environment.

Case 1)

  • Server : My Self Hosting Server
  • Client : PC Browser#1, #2, Android Sample App #1
    – Result
    — PC Browser #1, #2 : Success to recv/send video and audio. (even from android audio, video)
    — Android #1 : Success to recv audio and send video/audio. Failed to recv video.(failed to play video??)

Case 2)

  • Server : My Self Hosting Server
  • Client : PC Browser#1, #2, Android Browser #1
    – Result : Everything is ok.

Case 3)

  • Server : meet.jit.si
  • Client : PC Browser#1, #2, Android Sample App#1
    – Result : Everything is ok.

I don’t know what is the problem… please help me…

Case 4)
Server : My Self Hosting Server
Client : PC Browser#1, #2, Android Jitsi App(From PlayStore) #1
– Result : Everything is ok.