Video Transcoder Interface Bandwidth Allocation
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Solution Overview
Problem
Conventional video transcoders are limited by their reliance on personal computer platforms, requiring large secondary storage and supporting only a limited number of coding formats, which restricts their ability to efficiently transcode video in real-time for diverse rendering devices with varying video standards.
Innovation Solution
A system comprising a video decoder, encoder, and interface that transfers video data with a lower chroma subsampling ratio to free up bandwidth for non-video data, allowing real-time transcoding across multiple video standards without the need for additional interfaces, thereby improving encoding quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video data is transferred with full chroma subsampling ratio, then video quality is maintained, but bandwidth for non-video data becomes insufficient
Solution Approach 1:
The patent dynamically adjusts the chroma subsampling ratio parameter based on the type of video content being processed. For complex video sequences requiring high quality, a higher chroma subsampling ratio (e.g., 4:4:4) is used. For simpler sequences or when bandwidth is constrained, a lower ratio (e.g., 4:2:0) is applied. This parameter adaptation allows the system to optimize the balance between video quality and available bandwidth for non-video data transfer in real-time.
2Adaptability or versatility
If personal computer platforms with large secondary storage are used, then video transcoding capability is provided, but device complexity and storage requirements increase
Solution Approach 1:
The patent extracts and utilizes the unused bandwidth capacity inherent in video interface specifications. Standard video interfaces are designed to accommodate higher chroma subsampling ratios than typically employed. The invention captures this unused bandwidth and repurposes it for transferring non-video data (such as metadata, timing information, and control signals) between the video decoder and encoder, thereby eliminating the need for separate data buses or additional storage interfaces and reducing overall device complexity.
Solution Approach 2:
The video interface is designed to serve multiple functions simultaneously: it transfers video data at the specified chroma subsampling ratio while also carrying non-video data in the unused bandwidth capacity. This multi-functional approach allows a single interface to handle both video and non-video data transmission, reducing the need for additional separate interfaces or storage components and simplifying the overall system architecture.
3Productivity
If video interface bandwidth is fully allocated to video data, then video data transfer is optimized, but non-video data transfer capability is lost
Solution Approach 1:
The system dynamically adjusts the chroma subsampling ratio parameter based on the type of video content being processed. For complex video sequences requiring high quality, a higher chroma subsampling ratio (e.g., 4:4:4) is used. For simpler sequences or when bandwidth is constrained, a lower ratio (e.g., 4:2:0) is applied. This parameter adaptation allows the system to optimize the balance between video quality and available bandwidth for non-video data transfer in real-time.
Data Source
AI summary
A video transcoding system includes a video decoder, a video encoder, and a video interface. The video decoder is configured to decode a received video signal. The video encoder is configured to encode video data decoded from the received video signal by the video decoder. The video interface couples an output of the video decoder to an input of the video encoder and is configured to transfer video data having a first chroma subsampling ratio. The video decoder is further configured to provide video data having a second chroma subsampling ratio that includes fewer chrominance samples than the first chroma sampling ratio to the video interface, and to provide non-video information generated from decoding the received video signal to the video interface using video interface bandwidth usable based on a difference between the first chroma subsampling ratio and the second chroma subsampling ratio.