Video Encoding GOP Structure with GF Frames for Packet Loss
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Solution Overview
Problem
Current video encoding methods are inefficient for storage and transmission, leading to weak packet-loss resistance, especially under low network speeds, resulting in delayed playback or frame freezing due to the large size of I frames and reliance on sequential decoding of GOPs.
Innovation Solution
The method involves encoding video data into sequentially arranged groups-of-pictures (GOPs) where the first frame of each GOP is an I frame, and subsequent frames are GF frames, which record changes relative to I or GF frames in previous GOPs, allowing for quicker decoding and improved packet-loss resistance by using intra- and inter-frame prediction algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional video encoding methods are used with large I frames and sequential GOP decoding, then complete video data can be transmitted, but packet-loss resistance deteriorates and playback is delayed under low network speeds
Solution Approach 1:
The patent divides the video stream into groups of pictures (GOPs) where each GOP is an independent decoding unit. The first frame of each GOP is an I-frame that can be decoded independently, while subsequent frames reference previous frames. This segmentation allows the decoder to process and display video data in smaller, manageable chunks, improving packet-loss resistance and reducing playback delay under low network conditions.
Solution Approach 2:
The patent introduces GF-frames that contain predictive information about future frames based on previous frames. By pre-computing and transmitting this predictive data in advance, the system can reduce the amount of actual video data that needs to be transmitted in real-time, improving packet-loss resistance and enabling smoother playback under varying network conditions.
2Adaptability or versatility
If I frames are transmitted to enable random access and decoding, then decoding flexibility is improved, but transmission size increases and packet-loss resistance deteriorates
Solution Approach 1:
The patent segments the video into GOPs with I-frames at regular intervals, creating a structure where each GOP can be independently decoded. This segmentation provides decoding flexibility while controlling the frequency and size of I-frames, balancing random access capability with transmission efficiency and packet-loss resistance.
Solution Approach 2:
The patent modifies the traditional frame structure by introducing GF-frames with predictive coding parameters that reference previous frames. This changes the encoding parameters to reduce the amount of data that needs to be transmitted for each frame while maintaining decoding flexibility through the GOP structure.
3Device complexity
If sequential decoding of GOPs is used, then decoding simplicity is maintained, but packet-loss resistance deteriorates when network speed is low
Solution Approach 1:
The patent segments the video stream into independent GOPs where each GOP contains an I-frame that can serve as a starting point for decoding. This segmentation allows the decoder to handle packet loss more effectively by recovering from lost data in one GOP without affecting subsequent GOPs, improving packet-loss resistance while maintaining relatively simple sequential decoding logic.
Solution Approach 2:
The patent incorporates predictive coding in GF-frames that prepares information about future frames in advance. This preliminary action allows the decoder to have forward knowledge of upcoming frames, improving packet-loss resistance by enabling better prediction and recovery mechanisms while maintaining sequential decoding simplicity.
Data Source
AI summary
A video data encoding method is provided for an encoding device. The method includes obtaining first video data, and encoding the first video data to generate a plurality of sequentially arranged groups-of-pictures. A frame type of a first frame of an initial group-of-pictures in the plurality of groups-of-pictures is an I frame, frame types of first frames of the other groups-of-pictures are GF frames, and each GF frame is configured to record change information of a current frame of a corresponding group-of-pictures relative to an I frame or a GF frame in a previous group-of-pictures. The method also includes successively outputting the plurality of groups-of-pictures according to a sequence of the plurality of groups-of-pictures, to obtain second video data.