HEVC Trick Play Signaling via SEI GOP Metadata
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Solution Overview
Problem
Current technologies face challenges in efficiently providing a trick play function for HEVC-encoded content, particularly in transmitting and receiving signaling information for trick play operations, and in defining a suitable file format for HEVC streams to support high-quality, high-speed playback.
Innovation Solution
The solution involves encoding video source data with Supplemental Enhancement Information (SEI) messages containing Group of Pictures (GOP) metadata, including temporal ID, picture type, and temporal sub-layer information, and transmitting this data to enable efficient trick play operations. This includes creating a video stream with personal video recorder (PVR) assist information and using specific metadata to support temporal scalability and high-speed playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If HEVC compression method is used to transmit high-quality content, then the quality of broadcast content is improved, but the amount of data to be transmitted increases
Solution Approach 1:
The patent utilizes temporal scalability parameters in HEVC encoding to create multiple temporal layers (e.g., temporal ID 0 for base layer, temporal ID 1 for enhanced layer). By changing the temporal scaling factor and layer configuration, the system can adapt the amount of data transmitted while maintaining quality, enabling efficient trick play without requiring full HD data at all times.
2Adaptability or versatility
If conventional AVC stream format is used, then trick play function is available, but the scheme cannot be extended to HEVC-encoded content
Solution Approach 1:
The patent creates a universal signaling scheme that works for both AVC and HEVC streams by using standardized SEI message structures and GOP metadata fields. The same basic trick play signaling mechanism can be applied across different encoding standards, extending compatibility without requiring separate complex signaling systems for each codec.
Solution Approach 2:
The patent adapts the trick play signaling parameters to match HEVC-specific encoding characteristics, such as using temporal sub-layer picture type information and HEVC NAL unit types. This parameter adaptation allows the signaling scheme to remain compatible with HEVC while maintaining trick play functionality.
3Manufacturing precision
If full-resolution HEVC content is transmitted for high-quality playback, then the quality of content is improved, but the transmission efficiency decreases
Solution Approach 1:
The patent segments the video stream into multiple temporal layers using HEVC temporal scalability. The base layer (temporal ID 0) contains essential information for standard playback, while enhancement layers (temporal ID 1, 2, etc.) provide additional quality for high-speed trick play. This segmentation allows the receiver to selectively decode only the necessary layers for the desired playback mode, improving transmission efficiency.
Solution Approach 2:
For trick play operations, the system transmits only the necessary temporal layers required for the desired playback speed rather than all layers. When normal playback is needed, only the base layer is transmitted; when high-speed trick play is needed, additional temporal layers are transmitted. This partial action approach optimizes transmission efficiency by avoiding unnecessary data transfer.
Data Source
AI summary
The present invention relates to a device for transmitting and receiving a signal and a method for transmitting and receiving a signal. One embodiment of the present invention provides a method for transmitting a signal, comprising the steps of: encoding video source data and outputting video data including a supplemental enhancement information (SEI) message having group of pictures (GOP) metadata; and transmitting the video data. According to the embodiment of the present invention, a trick play for an encoded stream can be more efficiently provided.