Nenad Milidrag ha scritto: > Hi everybody, > > I have found following question asked number of times but I could not found > the answer. I would appreciate if somebody shed some light on this subject, > like if there is undergoing standardization of this matter or any widely > accepted solution. > > Since each codec has different support for packetization interval (ptime) > and SDP can specify multiple coders there is a need for specifying multiple > ptime attributes. However, so far I have not seen anybody using multiple > ptime attribute in one SDP. I saw suggestions that something like: > > m=audio 10000 RTP/AVP 0 8 > a=rtpmap: 0 PCMU/8000 > a=ptime:20 > a=rtpmap: 8 PCMA/8000 > a=ptime:30 > > , could be used but no RFC describes it and I have not seen it in practice. > > Thank you, > Nenad > ptime is a media attribute, so it can appear once inside a media definition (after "m line" and before another "m line"). This means that all payloads defined for the media have the same ptime. See RFC 2327.
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