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Unit [VCL and LCL] MRVType;
Unit [FMX] fmxMRVType;
type
  TRVGetMediaStreamIndexEvent = procedure(Sender: TObject; 
    StreamCount: Integer; var StreamIndex: Integer) of object;
This is the type of the following events:
•TRVCamSender.OnConnected, OnConnecting, OnDisconnect, OnConnectError
•TRVCamReceiver.OnConnected, OnConnecting, OnDisconnect, OnConnectError
This event allows choosing a video or an audio stream to play.
Parameters
StreamCount – the count of video or audio streams in a video file
StreamIndex – index of the media stream to play