Intelligent Video Playback Speed Control via Motion Detection
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Solution Overview
Problem
Current video surveillance playback methods are inefficient and inaccurate, as users often miss dynamic content while manually adjusting playback speed, leading to loss of important frames and unsmooth playback, especially when dealing with numerous static pictures interspersed with dynamic ones.
Innovation Solution
An intelligent playback method that automatically adjusts playback speed based on motion detection information, using a linked list to store motion data and control playback speed accordingly, distinguishing between motion and static frames to focus on dynamic content and reduce overall playback time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual means are used to adjust playback speed, then user can control playback, but efficiency and accuracy are low and important dynamic pictures may be missed
Solution Approach 1:
The system automatically detects motion in video frames and adjusts playback speed without user intervention. The playback device retrieves motion information from the video data, determines whether each frame contains motion, and automatically speeds up playback for static frames while maintaining normal speed for dynamic frames, making the system self-regulating rather than requiring manual control
Solution Approach 2:
The system uses motion detection feedback to dynamically adjust playback speed. By continuously analyzing motion information in video frames and using this feedback to control playback rate, the system creates a closed-loop control mechanism that optimizes playback efficiency based on actual content characteristics
2Productivity
If playback speed is constantly adjusted by parsing and encoding speed grade in key frames, then dynamic pictures can be emphasized, but playback becomes unsmooth
Solution Approach 1:
The video playback is segmented into static frames and dynamic frames based on motion detection. Instead of uniform speed adjustment, the system applies different playback rates to different segments (frames), playing back static frames rapidly and dynamic frames at normal speed, thereby maintaining overall playback smoothness while emphasizing dynamic content
Solution Approach 2:
The playback speed is made dynamic rather than static, adjusting automatically based on the motion content of each frame. The system transitions from constant speed playback to variable speed playback where the speed parameter changes dynamically according to detected motion information, optimizing both emphasis on dynamic content and playback smoothness
3Speed
If media server selectively reads video data according to play speed, then playback speed can be adjusted, but playback picture loss occurs
Solution Approach 1:
Motion information is extracted and stored in the video data during the recording phase, before playback occurs. This preliminary preparation allows the playback device to quickly determine which frames are static without needing to selectively read or skip data during playback, ensuring no picture loss while achieving rapid playback of static frames
Solution Approach 2:
Motion information serves as an intermediary between the video data and playback control mechanism. Rather than directly analyzing video frames during playback to determine speed adjustments, the system uses the pre-extracted motion information as a mediator to guide playback speed selection, ensuring both completeness and efficiency
4Reliability
If all video frames are played back at normal speed, then no dynamic pictures are missed, but playback time is excessively long
Solution Approach 1:
The playback speed parameter is changed based on the motion characteristics of each frame. Static frames are played back at a rapid speed (higher playback rate) while dynamic frames are played back at normal speed, thereby reducing overall playback duration while maintaining reliable detection and display of all dynamic content
Data Source
AI summary
The present invention relates to data application technologies in the field of video surveillance, and discloses an intelligent playback method for video records based on a motion information and an apparatus thereof. The method comprises the following steps: searching for all motion detection additional information conforming to a time period of a playback request in a hard disc, and storing the motion detection additional information as a motion information in a motion information linked list in terms of a time sequence; obtaining a current playback mode and a current playback time, and looking up a nearest motion information under the current playback mode and the current playback time from the motion information linked list; matching the found nearest motion information with the current playback time; controlling a playback speed according to a matching result, so as to implement an automatic control of an intelligent playback speed. A real-time, automatic, continuous control of a playback speed can be implemented by repeating performing the above steps, so that automatically adjusting to a normal playback speed when there is motion data and automatically adjusting to a rapid playback when there is no motion data are implemented, and a playback time of video records can be reduced.