Video transmission system with physical layer retransmission and real-time transmission functions

A video transmission system with physical layer retransmission and real-time transmission functions, comprising a first transmission terminal, a second transmission terminal and a transmission channel, wherein the first transmission terminal sends a downlink data packet to the second transmission terminal through the transmission channel, and the second transmission terminal sends retransmission control information to the first transmission terminal through the transmission channel;

• wherein,
• the downlink data packet comprises a retransmittable data packet and a real-time data packet, wherein the real-time data packet is used for transmitting video timing control signals,
• the first transmission terminal comprises a transmission memory, the first transmission terminal stores the retransmittable data packet into the transmission memory, and transmits the retransmittable data packet to the second transmission terminal, wherein the retransmittable data packet comprises a serial number, and a plurality of serial numbers contained in a plurality of consecutive retransmittable data packets are arranged in sequence according to a transmission order,
• the second transmission terminal receives the retransmittable data packet sent by the first transmission terminal, judges an abnormal state of the received retransmittable data packet, and generates retransmission control information if it is judged that the retransmittable data packet is abnormal, wherein the retransmission control information comprises the serial number of the retransmittable data packet to be retransmitted, and the first transmission terminal retransmits the retransmittable data packet to the second transmission terminal according to the retransmission control information,
• the first transmission terminal sends the real-time data packet to the second transmission terminal,
• the second transmission terminal receives the real-time data packet sent by the first transmission terminal, and does not generate retransmission control information regardless of whether the received real-time data packet is abnormal or not,
• wherein if the second transmission terminal judges that the received retransmittable data packet is a correct retransmittable data packet being correctly received, the second transmission terminal does not perform feedback confirmation on the correct retransmittable data packet.