Screen Projection Protocol Selection for Video Frame Reliability
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Solution Overview
Problem
In scenarios where a mobile terminal transmits video streams to multiple display devices, especially with limited network bandwidth, network channels are prone to being blocked, causing frame loss and delay, resulting in poor video picture quality.
Innovation Solution
A screen projection method that employs a reliability transmission protocol for I frames and selectively uses it for certain P frames based on preset conditions, such as inter-frame prediction parameters or importance, while using a non-reliability protocol for other P frames, to ensure transmission reliability and improve video quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reliability transmission protocol is used for all video frames, then transmission reliability is improved, but network bandwidth consumption increases and transmission delay increases
Solution Approach 1:
The patent segments video frames into different types (I frames, P frames, B frames) and applies different transmission protocols to each segment. I frames use reliability transmission protocol, while P and B frames use non-reliability transmission protocol, thereby reducing overall transmission delay while maintaining reliability for critical frames
Solution Approach 2:
The patent applies local quality by differentiating transmission quality based on frame importance. Critical frames (I frames) receive high-quality reliable transmission, while less critical frames (P frames, B frames) receive standard non-reliability transmission, optimizing the balance between reliability and speed
2Speed
If a non-reliability transmission protocol is used for all video frames, then transmission speed is improved, but frame loss increases and video picture quality deteriorates
Solution Approach 1:
The patent segments the video stream into different frame types and applies selective transmission protocols. I frames use reliability protocol to prevent loss, while P and B frames use non-reliability protocol for faster transmission, achieving both speed and reliability
Solution Approach 2:
The patent changes the transmission protocol parameter dynamically based on frame type and network conditions. The system adjusts the reliability parameter of transmission protocol according to the importance of each frame, optimizing both transmission speed and reliability
3Quantity of substance
If network bandwidth is increased to transmit to multiple display devices, then transmission capacity is improved, but network cost increases and system complexity increases
Solution Approach 1:
The patent implements dynamic transmission strategy where the controlling device dynamically selects transmission protocols based on real-time network conditions and frame importance. This dynamic adaptation allows the system to optimize transmission capacity without proportionally increasing system complexity
Solution Approach 2:
The system incorporates feedback mechanisms where the controlling device monitors network status and adjusts transmission protocols accordingly. This feedback loop enables efficient bandwidth utilization and prevents unnecessary system complexity by adapting to actual network conditions
Data Source
AI summary
A screen projection method and a device, the method including performing, by a controlling device, at least one of sending, based on a reliability transmission protocol, in response to an image frame that is to be sent being an I frame, a data packet that carries the image frame, sending, based on the reliability transmission protocol, in response to the image frame being a P frame that meets a first preset condition, the data packet that carries the image frame, or sending, based on a non-reliability transmission protocol, in response to the image frame being a P frame that does not meet the first preset condition, the data packet that carries the image frame.