Video Reproduction via ISOFF Temporal Layer Access Storage
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Solution Overview
Problem
High efficiency video compression technologies face difficulties in representing and storing temporal layer access location information efficiently, requiring analysis of Network Abstraction Layer (NAL) header information for each sample, which is cumbersome and inefficient.
Innovation Solution
The introduction of an International Organization for Standardization base media File Format (ISOFF)-based storage format that allows for the direct storage and extraction of temporal layer access location information, enabling selective extraction and reconstruction of samples for extended temporal layers without analyzing NAL header information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If temporal layer access location information is stored only through NAL header analysis, then the existing video compression standard is maintained, but the process becomes cumbersome and inefficient
Solution Approach 1:
The patent applies preliminary action by pre-storing temporal layer access location information in the video data structure during encoding. This allows the decoder to directly access temporal layer information without performing complex NAL header analysis during playback, thus improving efficiency while maintaining standard compatibility
Solution Approach 2:
The patent extracts temporal layer access location information from the complex NAL header structure and separates it into a dedicated, easily accessible field in the video data attribute information. This extraction simplifies the access process by isolating the critical information from the cumbersome header analysis
2Loss of information
If NAL header information is analyzed for each sample, then temporal layer access location information can be obtained, but the process is time-consuming and inefficient
Solution Approach 1:
The temporal layer access location information is prepared and stored in advance during the video encoding process. This preliminary action ensures that the information is readily available during playback without requiring time-consuming NAL header analysis for each sample
Solution Approach 2:
The patent creates a simplified copy of the temporal layer access location information in the video data attribute information structure. This copy contains the essential access information in a format that is much faster to process than the original NAL header structure
3Adaptability or versatility
If the existing video file format is used without modifications, then compatibility is maintained, but temporal layer access location information cannot be efficiently stored
Solution Approach 1:
The patent nests the temporal layer access location information within the existing video data attribute information structure. This nesting approach allows the new information to be stored within the familiar ISOFF container structure, maintaining format compatibility while enabling efficient temporal layer access
Solution Approach 2:
The patent adds a new dimension to the video file format by introducing a specific field for temporal layer access location information. This dimensional addition allows the format to store the required information efficiently while still being compatible with existing ISOFF-based structures
Data Source
AI summary
A method and an apparatus for reproducing video data are provided. The method includes the steps of extracting a coded video data stream and video data attribute information from the stored video file, extracting samples relevant to an expanded time layer from the extracted video data stream on the basis of the location information of the sample which allows for temporal layer access contailed in the video data attribute information, and restoring and reproducing the extracted samples.