Opened 16 years ago

Last modified 16 years ago

#486 closed defect

Handle audio/speech codec with 'problematic' clockrate — at Initial Version

Reported by: nanang Owned by: nanang
Priority: normal Milestone: release-0.9.0
Component: pjmedia Version: trunk
Keywords: Cc:
Backport to 1.x milestone: Backported:

Description

Some codecs need to be treated special:

  • G.722, because of erroneously assigned in RFC 1890, its actual sampling rate is 16kHz but need to be defined as 8kHz in the SDP and also affecting its RTP timestamp clock rate. (RFC 3551 4.5.2)
  • MPEG audio, for compatibility with other MPEG systems, MPEG Audio uses 90kHz

RTP timestamp clock rate separate from the audio sampling clock rate. (RFC 3551 4.5.13 & RFC 3119)

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