Video Management System Event Recording Buffering
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Solution Overview
Problem
Video management systems face data loss during event recording due to the constraints of network bandwidth and storage space, particularly because I-frames are not always available during short pseudo-recording periods, leading to abnormal video recording.
Innovation Solution
A video management system and method that buffers frames with basic video information and saves them upon event detection, using a buffer unit and event recording unit to store and save I-frames and P-frames on a storage medium, with initialization of the buffer at every transmission period or receipt of frames, ensuring reliable event recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pseudo recording time is set short to save storage space, then storage space utilization is improved, but key frames (I-frames) may not be available during the recording period, leading to abnormal video recording
Solution Approach 1:
The system performs preliminary actions by buffering incoming video frames (including I-frames and P-frames) before an event actually occurs. The buffer unit continuously stores received frames during the pseudo-recording period, so when an event is detected, the necessary key frames are already available in the buffer for immediate recording, eliminating the need for long pseudo-recording times.
2Reliability
If the pseudo recording time is extended to ensure key frame availability, then video recording reliability is improved, but storage space is wasted
Solution Approach 1:
The buffer unit acts as an intermediary between the network camera and the recording media. It temporarily holds video frames received from the camera, allowing the system to decouple the recording timing from the frame transmission timing. This intermediary buffer ensures key frames are available when needed without requiring extended pseudo-recording periods, thus saving storage space.
3Quantity of substance
If event recording is used instead of real-time recording to save storage space, then storage space utilization is improved, but video data loss occurs during the time to request and receive video after event detection
Solution Approach 1:
The system continuously buffers video frames in advance before events occur. When an event is detected, the buffered frames are immediately available for recording without requiring a request-and-wait process. This preliminary buffering action eliminates video data loss during event response while maintaining event recording's storage efficiency.
Data Source
AI summary
Provided is a video management apparatus and a method for event recording using the same, which are capable of reducing loss of video data in an event recording. The video management apparatus performs an event recording in cooperation with a network camera to transmit a first frame with basic information of video data and a plurality of second frames with changed information of the video data. The video management apparatus includes a buffer unit to store the first and the plurality of second frames, and eliminate the stored frames according to an external control signal. The video management apparatus further includes an event recording unit to save the first frame and at least one of the second frames stored in the buffer unit, and when detecting an occurrence of events, and frames transmitted from the network camera after the detection of the occurrence of events on a storage medium.