Group Video Synchronization via LMR Timestamps
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Solution Overview
Problem
Public-safety officers experience confusion due to latency differences in video sharing over LTE networks, causing asynchronous viewing of video among officers discussing the same subject matter, while voice communications via LMR networks remain instantaneous.
Innovation Solution
A method and apparatus for synchronizing group video by transmitting synchronization information, such as frame numbers or timestamps, over an LMR and/or LTE network upon a triggering event like a Push-to-Talk (PTT) button press or touchscreen touch, ensuring all users view the same spot in the video.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If video is shared over LTE network, then data rate is improved, but synchronization between viewers deteriorates
Solution Approach 1:
The patent introduces a synchronization message as an intermediary carrier that transports timing information between viewers. This synchronization message acts as a mediator that coordinates video playback across multiple devices by carrying frame number and timestamp data, resolving the synchronization problem while maintaining high-speed LTE video transmission.
Solution Approach 2:
The system implements feedback by having viewers send synchronization messages back to other viewers in the group. When a viewer successfully receives and processes video frames, they transmit synchronization information containing frame numbers and timestamps to other group members, creating a feedback loop that continuously maintains synchronization across the group.
2Speed
If voice communication is carried over LMR network, then instantaneous communication is achieved, but video sharing capability is lost
Solution Approach 1:
The LMR network is made multi-functional by using it for both voice communication and video synchronization purposes. The same LMR infrastructure that carries instantaneous voice communications is also utilized to transmit synchronization messages, allowing the system to leverage the proven reliable voice network for the additional function of video coordination.
Solution Approach 2:
The patent merges voice communication and video synchronization functions by transmitting both types of data over the same LMR network infrastructure. This combining approach allows instantaneous voice communication to continue while simultaneously using the network for video synchronization, eliminating the need for separate dedicated networks.
3Ease of operation
If users pause and resume video independently, then individual control is improved, but group synchronization deteriorates
Solution Approach 1:
The system dynamically adjusts video playback behavior based on synchronization state. Viewers can independently pause and resume video, but when synchronization is detected (through received synchronization messages), the system automatically advances the video to the synchronized frame number, dynamically reconciling individual control with group synchronization needs.
Solution Approach 2:
The system performs preliminary synchronization by having viewers continuously monitor for synchronization messages and pre-calculate the necessary video frame adjustments. Before group discussion begins, viewers ensure their video playback is synchronized by advancing to the frame number specified in received synchronization messages, preparing the system for coordinated viewing.
Data Source
AI summary
A method and apparatus for synchronizing group video is provided herein. Upon a triggering event, users viewing a video over an LTE network will transmit synchronization information (e.g., a frame number, or a time stamp of the video frame, . . . , etc.) over an LMR and/or LTE network. In response, user devices will synchronize to the same spot in the video.