docs: async def _send_rtcp_pli(self, media_ssrc):
          """
          Send an RTCP packet to report picture loss.
          """
          if self.__rtcp_ssrc is not None:
              packet = RtcpPsfbPacket(fmt=RTCP_PSFB_PLI, ssrc=self.__rtcp_ssrc, media_ssrc=media_ssrc)
              await self._send_rtcp(packet)