Video Bitstream Metadata Handling for Random Access Quality
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Solution Overview
Problem
Existing video codec technologies face challenges in efficiently processing and decoding high-resolution video data, particularly during random access scenarios where metadata information for video processing is lost or unavailable, leading to reduced video quality.
Innovation Solution
A method and apparatus for coded video data processing that involves obtaining metadata information for decoding order after a random access point in the bitstream, using metadata identification information to retrieve relevant metadata from a database, and strategically inserting metadata into the bitstream to ensure proper video processing, even during random access events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metadata information is transmitted with every picture in the bitstream, then video processing quality is improved, but bitstream overhead and data transmission volume increase
Solution Approach 1:
Instead of transmitting the actual metadata information with every picture, the patent transmits only metadata identification information (a compact reference) that points to the metadata stored in a separate database. This copying approach allows the decoder to retrieve the full metadata from the database using the identification, thereby maintaining video processing quality while significantly reducing bitstream overhead.
Solution Approach 2:
The patent extracts the bulky metadata information from the bitstream and places it in a separate database, keeping only lightweight metadata identification information in the bitstream. This separation removes the harmful overhead from the video data transmission while preserving the necessary information for video processing through the identification mechanism.
2Quantity of substance
If metadata information is not transmitted in the bitstream, then bitstream overhead is reduced, but video processing cannot be performed correctly after random access
Solution Approach 1:
The patent introduces metadata identification information as an intermediary between the bitstream and the full metadata in the database. This intermediary enables the decoder to request and retrieve the necessary metadata from the database after random access, ensuring video processing availability without burdening the bitstream with complete metadata transmission.
Solution Approach 2:
The patent performs preliminary action by storing metadata information in a database before video decoding. When random access occurs, the decoder can use the pre-stored metadata identification information to quickly retrieve the needed metadata from the database, ensuring video processing can proceed correctly without having the metadata embedded in the bitstream.
3Measurement precision
If complete metadata is stored in database, then video processing accuracy is improved, but database size and storage requirements increase
Solution Approach 1:
The patent applies local quality by storing only the essential metadata identification information in the bitstream rather than complete metadata. The full metadata is stored in the database, but the system only retrieves and processes the specific metadata portions needed for particular video processing tasks, optimizing both accuracy and storage efficiency.
Data Source
AI summary
Disclosed are a coded video data processing method and apparatus which consider a random access, and a coded video data generating method and apparatus which consider a random access. The coded video data processing method includes obtaining a bitstream of coded video data, obtaining metadata information used for video-processing of pictures having a decoding order after a random access point picture in the bitstream, and performing video-processing on decoded video data among the pictures having the decoding order after the random access point picture, based on the metadata information.