Video Decoding Timing Using Maximum Backward Prediction Delay
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Solution Overview
Problem
Existing video coding methods face challenges in accurately handling output time intervals when using backward interframe prediction, especially with variable frame rates, leading to unnatural video output due to inconsistent delay times.
Innovation Solution
A method that outputs the maximum delay time incurred by backward prediction, allowing for appropriate timing of decoded images by calculating and applying this delay time during both encoding and decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If backward interframe prediction is used to improve encoding efficiency, then encoding efficiency is improved, but output time intervals become inconsistent leading to unnatural video output
Solution Approach 1:
The patent calculates the maximum delay time incurred by backward prediction in advance during encoding, and outputs this delay time information along with the encoded video data. This preliminary calculation allows the decoding side to compensate for the delay and maintain correct output time intervals without requiring complex real-time adjustments.
2Productivity
If multiple reference frames are used in backward prediction to reduce temporal redundancy, then encoding efficiency is improved, but the complexity of handling output timing increases
Solution Approach 1:
The patent extracts the delay time information caused by backward prediction using multiple reference frames and outputs it as separate metadata alongside the encoded video data. This separation allows the decoding side to receive both the video data and the timing compensation information without increasing the complexity of the decoding process itself.
3Adaptability or versatility
If variable frame rates are used to adapt to different content requirements, then adaptability is improved, but accurately determining delay time becomes difficult
Solution Approach 1:
The patent incorporates feedback by calculating the actual maximum delay time based on the specific variable frame rate sequence being encoded, and outputs this calculated delay time as part of the encoded data. This feedback mechanism ensures that the delay time information accurately reflects the actual timing characteristics of the variable frame rate content, enabling precise timing compensation during playback.
Data Source
AI summary
A video processing system is provided with video encoding apparatus 1 and video decoding apparatus 2. The encoding apparatus 1 outputs a maximum delay time that is incurred by backward prediction, in addition to encoded data D1 resulting from encoding of video data D0. The decoding apparatus 2 effects input of the maximum delay time that is incurred by backward prediction, in addition to encoded data D1 from the encoding apparatus 1. Then the decoding apparatus 2 decodes the encoded data D1 with reference to the input maximum delay time to generate motion video data D2.