Two-Stage Video Transcoder Using Parameter Feedback
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Solution Overview
Problem
Current digital video transcoder systems face challenges in creating high-quality output streams at various spatial or temporal resolutions from a single input stream, particularly in ensuring compatibility with diverse devices and formats while maintaining acceptable video quality.
Innovation Solution
The system employs a two-transcoder module approach, where the first module transcodes an input stream into multiple output streams with different resolutions and formats, and the second module uses extracted parameters to enhance transcoding, producing additional output streams by correlating macroblock resolutions and bit rates, ensuring optimal video quality and format compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single transcoder module is used to transcode input stream, then device complexity is reduced, but the number of output streams and format compatibility is limited
Solution Approach 1:
The transcoder system is divided into multiple independent transcoder modules (first transcoder module and second transcoder module), where each module handles specific transcoding tasks. The first module generates initial output streams while the second module enhances quality for specific resolutions, allowing the system to produce numerous output streams in multiple formats without requiring a single overly complex module.
Solution Approach 2:
Multiple transcoder modules are employed to perform different functions: the first transcoder module handles general transcoding to produce N output streams, while the second transcoder module specializes in enhancing quality for specific resolutions using statistical parameters. This multi-functional approach enables the system to accommodate diverse display devices and formats simultaneously.
2Manufacturing precision
If transcoding is performed at high quality settings, then video quality is improved, but processing time and computational resources increase
Solution Approach 1:
The first transcoder module performs preliminary transcoding to generate N output streams and extract statistical parameters before the second module processes them. This preliminary action allows the second module to focus only on enhancing specific resolutions using pre-computed statistical information, reducing overall processing time while maintaining high quality.
Solution Approach 2:
Instead of applying uniform high-quality transcoding to all output streams, the system uses statistical parameters to apply quality enhancement selectively. The second transcoder module uses extracted parameters to improve quality specifically for output streams where it matters most, rather than uniformly processing all streams at maximum quality settings.
3Manufacturing precision
If statistical parameters are extracted and used to enhance transcoding, then video quality is improved, but system complexity increases
Solution Approach 1:
The system extracts statistical parameters from the transcoding process and feeds them back to enhance subsequent transcoding operations. The first transcoder module generates output streams and extracts statistical parameters, which are then used by the second transcoder module to improve quality. This feedback mechanism enables quality enhancement without requiring complex manual intervention.
Solution Approach 2:
The transcoder system uses its own generated statistical parameters to automatically enhance its output quality. Rather than requiring external quality assessment tools or manual tuning, the system extracts parameters from its own transcoding process and uses them to improve subsequent output streams, making the system self-improving.
Data Source
AI summary
The present invention provides methods and systems that create numerous high-quality output streams at different spatial or temporal resolutions from a single input stream. An input stream is transcoded at a first transcoder module to provide N output streams, wherein each of the N output streams comprises different versions of the input stream. Parameters are obtained during transcoding of the input stream and provided to a second transcoder module together with the input stream. The input stream may be transcoded at the second transcoder module to produce M output streams based on the parameters received from the first transcoder module. The parameters received from the first transcoder module may be used to enhance the transcoding at the second transcoder module.