Trick Play Signal Transmission Using Pre-Filtering Metadata
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Solution Overview
Problem
Conventional receivers face challenges in achieving high processing speed for trick play functions, especially with high-image quality content like UHD 4K or 8K, due to the lack of pre-filtering information about each picture before video decoding, which hinders smooth X speed reproduction within the maximum bit rate range.
Innovation Solution
A method and device for signal transmission/reception that include pre-filtering information such as transmission unit type and temporal ID in the file format, allowing for efficient trick play by encoding and decoding video data in a format like Base Media File Format or Common File Format, and using PVR assist information with a maximum temporal identification value to support X speed reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-image quality content (UHD 4K, 8K) is transmitted using HEVC encoding, then content quality is improved, but processing speed for trick play cannot be achieved at system level before video decoder input
Solution Approach 1:
The patent applies preliminary action by pre-filtering pictures based on temporal ID and dependency level information before the video decoding process. The receiver extracts pre-filtering information from the bitstream, identifies pictures that can be skipped or processed differently, and prepares filtering decisions in advance. This allows the system to maintain high content quality through HEVC encoding while achieving fast processing speeds for trick play functions by avoiding unnecessary decoding operations on selected pictures.
2Adaptability or versatility
If conventional H.264/AVC compression is used, then compatibility with existing systems is maintained, but data amount increases and cannot efficiently support high-quality UHD content
Solution Approach 1:
The patent applies parameter changes by transitioning from H.264/AVC to HEVC encoding, which fundamentally changes the compression parameters and algorithms. HEVC provides superior compression efficiency that reduces data amount by approximately 50% compared to H.264 at the same quality level, enabling efficient transmission of UHD content. The patent maintains compatibility with existing systems by incorporating standardized signaling mechanisms and ensuring that the enhanced encoding can be processed by modern receivers while still being compatible with existing infrastructure.
3Productivity
If each picture is filtered before decoding, then trick play performance is improved, but device complexity increases due to lack of pre-filtering information
Solution Approach 1:
The patent applies the intermediary principle by introducing pre-filtering information as an intermediate element in the bitstream between the encoder and decoder. This intermediary data structure contains temporal ID, dependency level, and other metadata that guides the picture filtering process. The receiver uses this pre-provided information to make filtering decisions without requiring complex analysis during the decoding process, thus improving trick play performance while avoiding excessive device complexity.
4Quantity of substance
If maximum bit rate range is used for transmission, then data transmission capacity is maximized, but X speed reproduction cannot be smoothly performed
Solution Approach 1:
The patent applies dynamics by implementing adaptive picture filtering based on temporal ID and dependency level information. The system dynamically adjusts which pictures are decoded and which are skipped based on the current playback position and trick play requirements. This dynamic approach allows the system to maintain smooth X speed reproduction by selectively processing only the necessary pictures, while still utilizing maximum bit rate capacity for transmitting high-quality content when needed.
Data Source
AI summary
The present invention relates to a signal transmission and reception apparatus and a signal transmission and reception method. An embodiment of the present invention provides a signal transmission method comprising: a step (S110) of encoding video data; a step (S120) of encoding a file format including the encoded video data, wherein the file format includes pre-filtering information for trick play; and a step (S130) of transmitting data including the encoded file format. According to an embodiment of the present invention, it is possible to provide trick play for an encoded stream more efficiently.