Transport Stream Recording via PID-Based Reference Frame Selection
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Solution Overview
Problem
Existing methods for recording digital television transport streams cannot selectively record recent portions in real-time, leading to image interruptions and requiring additional processes for regenerating video data.
Innovation Solution
The use of a packet identifier (PID) for identifying packets, recording-location information, and a reference frame to selectively map recording space, allowing real-time recording and regeneration of transport streams without image interruptions, using a PID-generating module, management module, and controller to determine the initial recording location based on PID changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional PTS buffer methods are used for recording transport streams, then video data can be stored, but selective recording of recent portions in real-time is not possible and image interruptions occur during regeneration
Solution Approach 1:
The patent segments the transport stream into individual PES packets and identifies reference frames within them. By segmenting the video data structure and using packet identifiers (PID) to mark specific frames, the system enables selective recording of recent portions without requiring buffer management that causes image interruptions. This segmentation allows real-time selective recording while maintaining image continuity.
2Ease of operation
If additional processes are implemented to verify PTS values and manage buffers, then video data regeneration can be controlled, but device complexity increases and real-time selective recording becomes difficult
Solution Approach 1:
The patent extracts the PTS verification and buffer management functions from the recording system by using packet identifiers (PID) and reference frame markers directly in the transport stream. Instead of complex buffer management processes, the system extracts only the necessary packets for selective recording based on PID changes, simplifying the device while enabling easy selective recording operation.
Solution Approach 2:
The transport stream itself carries the necessary information (PID, reference frame markers) that enables selective recording without external buffer management. The system uses self-contained packet identifiers and frame markers within the stream to automatically manage recording operations, eliminating the need for complex external PTS buffer management processes.
3Adaptability or versatility
If the entire transport stream is recorded continuously, then no image interruptions occur, but recording space is wasted and recent portion selective recording is not enabled
Solution Approach 1:
The patent performs preliminary identification of reference frames and packet identifiers (PID) within the transport stream before recording. By pre-marking reference frames and organizing packets with unique identifiers, the system prepares the data structure for efficient selective recording. This preliminary organization enables recording only recent portions while maintaining adaptability for different recording scenarios and optimizing storage space utilization.
Data Source
AI summary
Provided are method and apparatus for recording transport stream. Apparatus for recording transport stream includes a packet identifier (PID)-generating module which generates a PID for a packetized elementary stream (PES) packet; a management module which transmits the PES packet to be stored in a predetermined recording medium depending on whether there has been any change in the PID; a controller module which determines whether to record a first reference frame or a second reference frame of a video frame of the PES packet; and a packet-recording module which resets an initial recording location in the predetermined recording medium based on a result of the determination.