Stream Generating Apparatus for Accurate Slow-Motion Playback
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Solution Overview
Problem
Existing stream generating apparatuses fail to accurately achieve slow-motion playback of video streams recorded with fast imaging, as the playback time control information recorded during standard frame rates does not align with the intended playback speed, resulting in skipped frames during slow-motion playback.
Innovation Solution
A stream generating apparatus that includes a moving picture encoding processing section, a time control information generating section, and a multiplexing processing section, which generates a multiplexed stream by encoding moving picture data at different frame rates and creating playback time control information with specific intervals corresponding to the reference frame rate, allowing for playback at a speed different from the input-time speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If playback time control information synchronized with real time is recorded during fast frame rate imaging, then the time information accurately reflects the recording period, but the playback speed becomes too fast and skips frames during standard frame rate playback
Solution Approach 1:
The patent changes the parameter of time control information generation from real-time synchronization to fixed-interval generation based on reference frame rate. Specifically, the time control information generating section generates playback time control information at fixed intervals corresponding to the reference frame rate, regardless of the actual input frame rate. This parameter change allows the playback system to control display speed independently from the recording speed, resolving the contradiction between accurate time recording and controlled playback speed.
2Adaptability or versatility
If video data is imaged at a frame rate several times faster than standard frame rate, then slow-motion playback capability is enabled, but the playback cannot be accurately controlled to match user intention
Solution Approach 1:
The patent introduces an intermediary component - the time control information generating section - that acts as a mediator between the variable frame rate input and the standard frame rate playback. This intermediary generates fixed-interval time control information based on reference frame rate, decoupling the relationship between input frame rate and playback frame rate. This allows the system to reliably play back video at standard frame rates while accepting input at various frame rates, thus enabling both adaptability and reliability.
3Ease of operation
If standard time control information generation method is used, then the system works correctly for normal frame rate video, but it fails to achieve accurate slow-motion playback for fast frame rate video
Solution Approach 1:
The patent makes the time control information generating section universal by designing it to generate time control information based on a reference frame rate regardless of the actual input frame rate. This multi-functional approach allows the same system to handle both standard frame rate video (where input frame rate equals reference frame rate) and fast frame rate video (where input frame rate exceeds reference frame rate). The system thus achieves both standard playback compatibility and slow-motion playback capability through a single unified mechanism.
Data Source
AI summary
There is provided stream generating apparatus which generates a multiplexed stream including moving picture data. The apparatus includes a moving picture encoding processing section for generating a moving picture stream by encoding the moving picture data allowing switching between a reference frame rate and more than one frame rate different from the reference frame rate according to a desired timing; a time control information generating section for generating playback time control information with certain intervals corresponding to picture frame display cycles relevant to the reference frame rate, for each picture frame inputted to the moving picture encoding processing section; and a multiplexing processing section for generating the multiplexed stream by multiplexing the moving picture stream and the playback time control information.