Selective Re-transcoding of Key-Frame-Aligned Video Segments
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Solution Overview
Problem
In digital media encoding, quality assurance processes are time-consuming and costly due to the need to re-transcode entire groups of files when a single file fails quality control, especially in adaptive streaming where key frame alignment across multiple files with different quality levels is required.
Innovation Solution
The method involves re-transcoding only the failing portion of a digital media file while maintaining key frame alignment by using a timestamp and length of the failing segment, generating a key frame listing file from transcoding statistics, and re-transcoding the original segment to produce a re-transcoded segment with the same key frame locations, allowing substitution without disrupting alignment across files.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire group of key-frame-aligned digital media files is re-transcoded when a single file fails quality control, then quality assurance is ensured across all files, but re-transcoding processing time and computational resources are significantly increased
Solution Approach 1:
The patent divides the re-transcoding operation into two approaches: (1) segment-level re-transcoding where only the specific failing segment is re-transcoded and replaced, or (2) file-level re-transcoding where only the failing file is re-transcoded while other files in the group are preserved. This segmentation allows quality assurance to be applied selectively rather than to the entire group, resolving the contradiction between ensuring quality and minimizing processing time.
2Loss of time
If only the failing portion of a digital media file is re-transcoded, then re-transcoding processing time is reduced, but maintaining key frame alignment across files becomes more complex
Solution Approach 1:
The patent performs preliminary actions by extracting and storing key frame timing information and segment metadata before the re-transcoding process. The system pre-identifies key frame locations, segment boundaries, and alignment parameters, which are then used during selective re-transcoding to automatically maintain key frame alignment. This preliminary preparation simplifies the subsequent re-transcoding operation and eliminates the need for complex real-time alignment calculations.
Data Source
AI summary
Systems and methods are provided for re-transcoding portions of a digital media file while maintaining key-frame alignment across a set of digital media files having the same content. Instead of re-transcoding the entire set of digital media files if a portion of a single video fails quality, the disclosed systems and methods allow only the failing portion of the video to be re-transcoded.