MPEG Video Playback Speed Recovery via Header Data Extraction
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Solution Overview
Problem
Conventional video systems struggle to playback high frame rate recorded video at its true speed due to lack of information about the original recording frame rate, resulting in compatibility issues with existing playback systems.
Innovation Solution
Incorporating a recorded-time-increment-resolution data portion into the user data of the VOL header and each VOP header of an MPEG compressed Group of Pictures (GOP) to represent the true recording frame rate, allowing decoders to recognize and playback video at the intended speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high frame rate video is recorded and stored in conventional MPEG format, then compatibility with existing playback systems is maintained, but the original recording frame rate information is lost making true-speed playback impossible
Solution Approach 1:
The patent extracts the recorded time increment resolution information from the encoding process and stores it separately in the user data portion of the VOL header. This extracted information is then used during playback to calculate the original frame rate, enabling true-speed playback while maintaining compatibility with standard MPEG decoders that ignore the user data portion.
Solution Approach 2:
The patent uses the user data portion of the VOL header as an intermediary carrier to transport the recorded time increment resolution information. This intermediary structure allows the information to be embedded in the standard MPEG bitstream without interfering with normal decoding operations, while providing access to the original frame rate data for specialized playback.
2Ease of operation
If video time stamps are scaled to match a lower frame rate during encoding, then the video can be played back on conventional systems, but the true recording speed cannot be recovered
Solution Approach 1:
The patent performs preliminary encoding of the video at the high frame rate while simultaneously encoding the original time increment resolution information into the VOL header user data portion. This preliminary action preserves the precise timing information before any scaling or conversion occurs, allowing later recovery of the original frame rate even if the video is first played back at a lower rate.
3Reliability
If additional data portions are added to the MPEG bitstream to preserve frame rate information, then true-speed playback becomes possible, but the bitstream complexity increases
Solution Approach 1:
The patent uses the existing user data portion of the VOL header for multiple purposes: it can carry recorded time increment resolution information when high frame rate video is encoded, while remaining compatible with standard decoders that simply ignore it. This multi-functionality allows the same data structure to serve both conventional playback and high-precision true-speed playback requirements without increasing overall system complexity.
Data Source
AI summary
A method to record high frame rate video, compatible with existing industry standards, that permits selecting either slow-motion playback or true speed playback with synchronized audio.