Video Frame Portion Encoding with Independent Headers
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Solution Overview
Problem
Current HEVC mechanisms are not designed to efficiently handle scenarios involving the streaming of individual tiles or sets of tiles, or the combination of different tiles to compose a new video sequence, requiring additional encoding constraints and rewriting processes.
Innovation Solution
The method involves defining frame portions and signaling them in the bitstream, allowing for the extraction and recombination of these frame portions at decoding while minimizing rewriting processes. This includes encoding frame portions into encoded units, signaling frame portion identifiers, and providing frame portion arrangement information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HEVC tiles are used for parallel encoding, then encoding efficiency is improved, but flexibility for streaming individual tiles or recombining tiles is reduced
Solution Approach 1:
The video frame is divided into multiple independent frame portions, each with its own header containing identification and arrangement information. This segmentation allows individual portions to be extracted, streamed, or recombined independently while maintaining encoding efficiency through parallel processing of separate portions.
Solution Approach 2:
The frame portion structure is designed to serve multiple functions: it enables parallel encoding like HEVC tiles, allows independent streaming of any portion, supports recombination of different portions, and maintains compression efficiency. The universal header format and independent structure make the system adaptable to various应用场景.
2Adaptability or versatility
If individual tiles are streamed or recombined, then flexibility is improved, but encoding constraints and rewriting processes are increased
Solution Approach 1:
During the encoding phase, each frame portion is pre-equipped with a header containing its identification information and arrangement data. This preliminary action ensures that when portions need to be streamed or recombined, no additional rewriting or manipulation of headers is required, significantly reducing decoding complexity.
Solution Approach 2:
Each frame portion is designed to be self-contained with all necessary information (identification, arrangement, encoding parameters) embedded in its own header. This self-service design allows portions to be independently processed, extracted, and recombined without requiring external rewriting processes or dependency on other portions' data structures.
3Adaptability or versatility
If frame portions are independently encoded, then flexibility for extraction is improved, but compression efficiency may be reduced
Solution Approach 1:
The encoding approach applies different quality levels and encoding parameters to different frame portions based on their importance and usage requirements. Critical portions can be encoded with higher quality and more robust parameters, while less critical portions use more aggressive compression, optimizing the overall balance between extraction flexibility and compression efficiency.
Solution Approach 2:
Each frame portion can have its own encoding parameters (quantization, resolution, compression level) independently adjusted. This allows the system to optimize compression efficiency by varying parameters across different portions while maintaining the ability to extract and stream any portion independently with appropriate quality characteristics.
Data Source
AI summary
The present invention concerns a method of encoding video data comprising frames into a bitstream, frames being spatially divided into frame portions, the method comprising:encoding at least one frame portion into one or more first encoded units;wherein the method further comprises:signalling into said first encoded units, at least one frame portion identifier, a frame portion identifier identifying one encoded frame portion; andproviding frame portion arrangement information comprising the frame portion identifier and spatial information about the frame portion.