Video Decoder Profile Compatibility for Still Pictures
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Solution Overview
Problem
Current VVC specifications face challenges in decoding an extracted IRAP picture from a Main 10 video bitstream using a decoder conforming to the Main 10 Still Picture profile, requiring bitstream rewriting, and also result in an illegal bitstream when trying to decode multiple pictures as only one picture is allowed in the Main 10 Still Picture profile.
Innovation Solution
A method to determine if a decoder conforming to a first profile can decode a video bitstream conforming to a second profile by checking an indicator value and determining if the first picture is a still picture, allowing the bitstream to conform to the first profile without rewriting, and enabling decoding of the first picture even if the bitstream contains multiple pictures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a decoder conforming to Main 10 Still Picture profile is used to decode an extracted IRAP picture from a Main 10 video bitstream, then the decoding capability is limited, but bitstream rewriting is required to enable decoding
Solution Approach 1:
The patent changes the interpretation of profile conformance parameters based on picture type. Specifically, it allows a decoder conforming to Main 10 Still Picture profile to decode pictures from Main 10 video bitstream when certain conditions are met (IRAP picture type, specific parameter values), without requiring bitstream rewriting. This resolves the contradiction by making the decoder's profile interpretation flexible rather than fixed.
2Productivity
If multiple pictures are decoded from a Main 10 video bitstream, then more content is processed, but the bitstream becomes illegal under Main 10 Still Picture profile specifications
Solution Approach 1:
The patent introduces dynamic interpretation of profile constraints based on the actual content being decoded. Instead of rigidly enforcing the single-picture limitation of Main 10 Still Picture profile, the system dynamically allows multiple pictures to be decoded when they meet specific criteria (IRAP picture type, appropriate parameter configurations). This makes the profile conformance rules adaptive rather than static, enabling multi-picture decoding while maintaining profile compatibility.
3Ease of operation
If bitstream rewriting is performed to enable Main 10 Still Picture profile decoding, then decoding capability is achieved, but processing time and complexity increase
Solution Approach 1:
The patent performs preliminary analysis of the bitstream parameters and picture types during the decoding initialization phase, before actual decoding begins. By pre-determining whether the bitstream can be decoded under Main 10 Still Picture profile constraints (checking for IRAP picture types, verifying parameter values), the system avoids the need for time-consuming bitstream rewriting operations during runtime, thus reducing processing time while maintaining decoding capability.
Data Source
AI summary
A method and decoder for determining that a decoder conforming to a first profile is capable of decoding a first picture of a video bitstream conforming to a second profile is provided. The method includes obtaining an indicator value, the indicator value indicating conformance to a profile. The method includes determining whether the first picture in the video bitstream is a still picture. The method includes responsive to the indicator value indicating conformance to the second profile and the first picture is determined to be a still picture, determining that the decoder conforming to the first profile is capable of decoding the first picture of the video bitstream.