MPEG-2 TS Media File Transmission via PTS to MPT Mapping
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Solution Overview
Problem
MPEG-2 Transport Streams struggle with efficient transmission and synchronization of high-resolution media files over IP networks, particularly in scenarios involving stereoscopic 3D, UHD, and hologram broadcasting, due to limitations in providing precise media presentation time information for random access and continuous playback.
Innovation Solution
The method involves mapping Presentation Time Stamps (PTS) of MPEG-2 TS packets to Media Presentation Time (MPT) and transmitting synchronization information, allowing for precise media presentation timing and synchronization across multiple program elements, even in cases of PTS discontinuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MPEG-2 TS is used to transport high-resolution media files over IP network, then media transmission is enabled, but transmission efficiency deteriorates
Solution Approach 1:
The patent segments the MPEG-2 TS stream into chunks and encapsulates them in ISO Base Media File Format containers, allowing efficient IP network transmission while maintaining the ability to handle high-resolution content. This segmentation enables random access and synchronized playback without requiring the entire stream to be transmitted first.
Solution Approach 2:
The patent introduces Media Presentation Time (MPT) as an intermediary timing mechanism that bridges MPEG-2 TS Presentation Time Stamps with ISO Base Media File Format timing. This intermediary allows synchronized playback across different media formats and networks while maintaining transmission efficiency.
2Measurement precision
If MPEG-2 TS packets are transmitted over IP network, then media delivery is achieved, but synchronization precision deteriorates
Solution Approach 1:
The patent performs preliminary timing synchronization by mapping MPEG-2 TS Presentation Time Stamps to Media Presentation Time before transmission. This preliminary action ensures that timing information is preserved and synchronized playback can occur without loss of precision, even when PTS discontinuities occur.
Solution Approach 2:
The patent implements feedback mechanisms through synchronization information that tracks and compensates for PTS discontinuities. By monitoring timing deviations and providing corrective synchronization data, the system maintains precise media presentation timing throughout transmission and playback.
3Ease of operation
If random access to media file is enabled, then playback flexibility is improved, but synchronization complexity increases
Solution Approach 1:
The patent divides the media file into segmented chunks within the ISO Base Media File Format structure, with each segment containing necessary synchronization information. This segmentation enables random access to any segment independently while maintaining synchronization through the embedded timing data, reducing the complexity of global synchronization mechanisms.
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AI summary
A method and apparatus for transmitting and receiving an MPEG-2 TS-based media file are provided. In the method of transmitting an MPEG2 Transport Stream (TS)-based media file, a Presentation Time Stamp (PTS) of a Presentation Unit (PU) is mapped to a Media Presentation Time (MPT) for synchronization with other media with respect to at least one program element forming a program included in the media file; and synchronization information including the mapped media presentation time is transmitted together with the media file, wherein the media presentation time is provided for a first PU in a segment of the transmitted media file.