Pre-rendered Caption Overlay for Video Uniformity
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Solution Overview
Problem
Existing video caption rendering technologies face challenges in maintaining uniformity across different user devices due to varying software renderers and the inability to render certain captions, such as vertical text or non-standard glyphs, and require changes to the video file when updating or adding new languages, which complicates debugging and editing.
Innovation Solution
A method where pre-rendered visual representations of captions, such as images, are sent out-of-band with video information, allowing user devices to directly overlay these images onto the video without rendering text, ensuring uniformity and compatibility across devices, and enabling changes to captions without modifying the video file.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If software renderers are used to render captions on different user devices, then caption rendering flexibility is improved, but display uniformity deteriorates due to varying renderer implementations
Solution Approach 1:
The patent pre-renders captions into visual representations (images) before transmission to user devices. This preliminary rendering action ensures that captions are rendered consistently in advance, eliminating variations caused by different software renderer implementations on different devices. The pre-rendered visual representations are then transmitted to user devices for direct display, ensuring uniformity across all devices.
2Stability of the object's composition
If captions are multiplexed with video in the same file (in-band), then integration is improved, but flexibility for updating captions deteriorates
Solution Approach 1:
The patent separates captions from video into distinct streams. Captions are transmitted as visual representations in a separate caption stream from the video stream. This segmentation allows independent modification of captions without affecting the video file, enabling easy updates and additions of languages while maintaining integration through the caption overlay process.
3Ease of manufacture
If pre-rendered visual representations of captions are sent out-of-band with video, then caption update flexibility is improved, but data transmission complexity increases
Solution Approach 1:
The patent uses visual representations (pre-rendered images) as intermediaries to carry caption information. Instead of transmitting raw text or multiplexed data, the system transmits pre-rendered visual representations that serve as a mediator between the caption content and the display. This intermediary approach simplifies the transmission process while maintaining flexibility for updates.
Data Source
AI summary
In one embodiment, a method receiving a request for a media program from a user device. The method then determines a set of visual representations of captions for the media program and determines video information for the media program. Visual representations from the set of visual representations of captions are sent with the video information over a network to the user device where text for the captions has been pre-rendered in the sent visual representations before sending of the visual representations to the user device. Also, the user device is configured to directly render and overlay a visual representation of a caption from the visual representations over a portion of the video information without rendering of the text for caption on the portion of the video information at the user device.