Codec Negotiation for Wireless Video Transmission
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Solution Overview
Problem
Existing methods for transmitting video content over wireless networks face challenges in real-time reproduction and small bandwidth communication links, as non-compressed transmission is time-consuming and compressed transmission requires notification of the codec type to the receiver.
Innovation Solution
A method and apparatus for transmitting video content using multiple codecs, where a first device sends a codec selection request frame to a second device, receives approval, and transmits compressed video content based on the response, including capability requests and responses to determine supported codecs and compression capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If video content is transmitted in a non-compressed form, then the video quality is preserved without degradation, but the transmission time increases and bandwidth consumption increases
Solution Approach 1:
The patent applies preliminary action by performing codec selection and capability negotiation before the actual video content transmission. The transmitting device sends a capability request frame to identify supported codecs, and both devices agree on a common codec beforehand. This preliminary setup enables efficient compressed transmission without quality degradation, as the appropriate compression algorithm is predetermined based on device capabilities and network conditions.
2Loss of time
If video content is compressed using a codec, then the transmission time is reduced and bandwidth efficiency is improved, but the receiver must be notified about the codec type used
Solution Approach 1:
The patent segments the transmission process into distinct phases: capability negotiation phase (exchanging capability request and response frames to identify supported codecs), codec selection phase (agreeing on a common codec), and actual video transmission phase. This segmentation reduces complexity by handling codec identification separately from content transmission, allowing the receiver to be properly notified of the codec type through structured negotiation frames without complicating the main video data flow.
3Adaptability or versatility
If multiple different codecs are supported by devices, then the adaptability and compatibility are improved, but the difficulty of codec selection and agreement increases
Solution Approach 1:
The patent implements feedback mechanisms through capability request and response frames. The transmitting device sends a capability request frame listing its supported codecs, and the receiving device responds with a capability response frame indicating which codecs it supports. This bidirectional feedback enables automatic codec agreement by identifying the intersection of supported codecs, making multi-codec support manageable through structured negotiation rather than manual configuration.
Data Source
AI summary
A method and apparatus of transmitting video content compressed by a codec to a second device is provided. The method includes: transmitting a codec selection request frame to the second device, the codec selection request frame includes an identifier of at least one codec to be used to compress the video content and requests approval of the use of the at least one codec; receiving a codec selection response frame from the second device, the codec selection response frame includes approval information indicating whether the use of the at least one codec is approved; and transmitting video content compressed by the at least one codec to the second device based on the codec selection response frame.