Program clock reference correction in transport stream processors with rate adaptation

Program clock reference correction in transport stream processors with rate adaptation

The program clock reference (PCR), which is carried by MPEG-2 transport streams, is commonly used for synchronizing different media types, in receivers. In summary, it is a snapshot of the transmitter’s 27 MHz counter and is employed to adapt the local clock. However, the PCR may present inaccuracie...

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Bibliographic Details
Published in:Multimedia tools and applications Vol. 76; no. 12; pp. 14107 - 14128
Main Authors: Savino, Heitor Judiss, de Lima Filho, Eddie Batista
Format: Journal Article
Language:English
Published: New York Springer US 01-06-2017
Springer Nature B.V
Subjects:
Adaptation
Computer Communication Networks
Computer Science
Data Structures and Information Theory
Digital media
MPEG encoders
Multimedia Information Systems
Special Purpose and Application-Based Systems
Stability
Synchronism
Transport
Vibration
Video compression
Jitter
Semaphore
Transport stream
PCR correction
MPEG-2
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Summary:The program clock reference (PCR), which is carried by MPEG-2 transport streams, is commonly used for synchronizing different media types, in receivers. In summary, it is a snapshot of the transmitter’s 27 MHz counter and is employed to adapt the local clock. However, the PCR may present inaccuracies on its time base information, known as jitter, given that the processing chain between transmitter and receiver often modifies relative distances among time stamps. In order to correct such a behavior, some authors have suggested PCR-jitter control schemes, which are able to compensate for new PCR positions, in streams. Nevertheless, as none of them takes into account the asynchronism among all elements involved in this procedure, there is often an increase in jitter. The present paper addresses this problem and introduces a methodology for joint rate adaptation and PCR correction, which has the potential to reduce the output jitter, when it is caused by stream modifications due to a rate adaptation module. Simulation results show that the proposed method is effective and outperforms traditional and more recent schemes presented in the literature, by keeping the output jitter level as close as possible to the one at the input and, consequently, avoiding large clock deviations.
ISSN:1380-7501
1573-7721
DOI:10.1007/s11042-016-3814-3