RTP Payload Format for Elementary Streams with MPEG Surround Multi-Channel Audio

Doehla, Stefan; Iis, Fraunhofer; Schmidt, Mischa; Sperschneider, Ralph

doi:10.17487/rfc5691

Cited by 1 publication

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References 8 publications

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“…If a layered encoding is used, where the media data is split across several RTP flows, then it is often necessary to exactly synchronise the RTP flows comprising the different layers before layers other than the base layer can be decoded. Examples of such layered encodings are H.264 SVC in NI-T mode [AVT-RTP-SVC] and MPEG surround multi-channel audio [RFC5691]. As described in Section 2, such synchronisation is possible in RTP, but can be difficult to perform rapidly.…”

Section: Application To Decoding Order Recovery In Layered Codecsmentioning

confidence: 99%

Rapid Synchronisation of RTP Flows

Perkins¹,

Schierl²

2010

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This memo outlines how RTP sessions are synchronised, and discusses how rapidly such synchronisation can occur. We show that most RTP sessions can be synchronised immediately, but that the use of video switching multipoint conference units (MCUs) or large source-specific multicast (SSM) groups can greatly increase the synchronisation delay. This increase in delay can be unacceptable to some applications that use layered and/or multi-description codecs.This memo introduces three mechanisms to reduce the synchronisation delay for such sessions. First, it updates the RTP Control Protocol (RTCP) timing rules to reduce the initial synchronisation delay for SSM sessions. Second, a new feedback packet is defined for use with the extended RTP profile for RTCP-based feedback (RTP/AVPF), allowing video switching MCUs to rapidly request resynchronisation. Finally, new RTP header extensions are defined to allow rapid synchronisation of late joiners, and guarantee correct timestamp-based decoding order recovery for layered codecs in the presence of clock skew.

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Section: Application To Decoding Order Recovery In Layered Codecsmentioning

confidence: 99%

Rapid Synchronisation of RTP Flows

Perkins¹,

Schierl²

2010

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show abstract

RTP Payload Format for Elementary Streams with MPEG Surround Multi-Channel Audio

Cited by 1 publication

References 8 publications

Rapid Synchronisation of RTP Flows

Rapid Synchronisation of RTP Flows

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