Wireless Audio Video Sync via Preliminary Transmission
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Solution Overview
Problem
Multimedia playback systems face issues with unsynchronized audio and video playback due to packet loss during wireless transmission, particularly when using wireless loudspeakers, as existing methods to mitigate packet loss increase processing time and worsen synchronization problems.
Innovation Solution
A method and system for synchronized multimedia playback that initially transmits audio data to a wireless loudspeaker and holds video data for a threshold time equal to the audio transmission delay, allowing both audio and video to be played synchronously by encapsulating audio data into RTP packets and using buffers to manage data transmission and playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the buffer size is increased to compensate for data loss during wireless transmission, then the reliability of audio playback is improved, but the processing time is increased and video-audio synchronization is worsened
Solution Approach 1:
The system performs preliminary actions by transmitting the initial part of audio data to the wireless loudspeaker before video playback starts. This advance transmission allows the audio to be ready for immediate playback, compensating for wireless transmission delays without requiring large buffers that would increase processing time and desynchronize video-audio playback.
Solution Approach 2:
Instead of delaying video playback to wait for audio transmission (conventional approach), the invention inverts the approach by transmitting audio in advance before video starts. This reversal of the temporal sequence allows audio to be pre-positioned at the loudspeaker, eliminating the need for large buffers while maintaining synchronization.
2Reliability
If audio packets are temporarily stored until all are received through WLAN, then packet loss is avoided, but audio playback becomes asynchronous relative to video playback
Solution Approach 1:
The system transmits the initial part of audio data to the wireless loudspeaker before video playback begins. This preliminary transmission ensures that audio data is available at the loudspeaker in advance, allowing playback to start同步 with video without requiring all audio packets to be received and stored beforehand, thus avoiding asynchronous delays.
3Adaptability or versatility
If wireless transmission is used to transmit audio data to the loudspeaker, then system flexibility is improved, but packet loss occurs due to interference
Solution Approach 1:
By transmitting the initial part of audio data to the wireless loudspeaker before video playback starts, the system allows audio transmission to begin immediately without waiting for potential retransmissions. This preliminary transmission approach maintains wireless flexibility while reducing the impact of packet loss, as the critical initial audio data is already in place for synchronized playback.
Data Source
AI summary
A method for synchronized playback of wireless audio and video is applicable to a playback system. The method for synchronized playback includes steps of receiving and processing multimedia data by the playback system, in which the multimedia data includes video data and audio data; wirelessly transmitting the audio data to a loudspeaker and meanwhile holding the video data for a threshold time; and finishing the transmission of the audio data when the threshold time is reached, so that the video data and the corresponding audio data are synchronously played. The method for synchronized playback can control the delay caused by the wireless audio transmission, thus achieving the objective of synchronously playing the audio and video data.