Multimedia Data Key Frame Access via Reproduction Control
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Solution Overview
Problem
Existing techniques for special reproduction of multimedia data in ISO Base Media File Format are inefficient due to complex data structures and correlations, leading to time-consuming processing and potential delays in accessing key frames for random access and fast-forward operations.
Innovation Solution
A data recording and reproduction apparatus that detects key frames in encoded video data, generates reproduction controlling data to identify time/data locations, and decodes key frames for efficient special reproduction, utilizing a data structure like RandomAccessPointBox to facilitate rapid access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional ISO file format data structures are used for special reproduction, then compatibility with standard formats is maintained, but processing time increases and access efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-generating and storing reproduction controlling data that identifies time and data location information of key frames during the recording phase. This allows the reproduction apparatus to directly access pre-identified key frame locations without performing complex frame extraction processing during playback, thereby resolving the contradiction between maintaining standard format compatibility and improving access efficiency.
2Reliability
If complex data structure correlations are processed during special reproduction, then accurate key frame identification is achieved, but processing complexity and time consumption increase
Solution Approach 1:
The patent extracts the complex frame extraction processing from the reproduction phase and moves it to the recording phase. By generating reproduction controlling data that directly identifies key frame time and location information during recording, the system eliminates the need for complex data structure correlation processing during special reproduction, thus maintaining identification accuracy while reducing processing complexity.
3Ease of operation
If random access to I pictures is performed using conventional methods, then decoding can be performed, but delay occurs and efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by pre-identifying and storing the time and data location information of key frames (I pictures) during the recording process. The reproduction controlling data contains direct pointers to these key frames, allowing the reproduction apparatus to immediately access the required I picture without performing complex decoding or search operations, thereby eliminating delay and improving random access capability.
Data Source
AI summary
Information that identifies key frames in video data within multimedia data is generated as reproduction controlling data and the reproduction controlling data is positioned at a predetermined position in the multimedia data. Upon special reproduction, the reproduction controlling data can be used to easily identify, read out, and reproduce key frames that should be used for random access and the like. By positioning the reproduction controlling data in an area within the multimedia data that is ignored by conventional apparatuses, file compatibility can be also maintained. This attains increased efficiency of special reproduction processing of multimedia that has ISO Base file format or a similar format.