T4xs series opus codec - Printable Version +- Yealink Forums (http://forum.yealink.com/forum) +-- Forum: IP Phone Series (/forumdisplay.php?fid=4) +--- Forum: T4x Series (/forumdisplay.php?fid=31) +--- Thread: T4xs series opus codec (/showthread.php?tid=46525) |
T4xs series opus codec - volga629 - 03-20-2023 09:47 PM Hello Everyone, I been testing Yealink opus and ran into issue where are SDP in INVITE is not follow RFC 7587 It offer opus/8000, but should be opus/48000 MHz always and actual stream can be adjusted as need it. How possible to open bug report on this Code: User-Agent: Yealink SIP-T41S 66.84.0.15 Explanation Opus supports 5 different audio bandwidths, which can be adjusted during a stream. The RTP timestamp is incremented with a 48000 Hz clock rate for all modes of Opus and all sampling rates. The unit for the timestamp is samples per single (mono) channel. The RTP timestamp corresponds to the sample time of the first encoded sample in the encoded frame. For data encoded with sampling rates other than 48000 Hz, the sampling rate has to be adjusted to 48000 Hz. and Required parameters: rate: the RTP timestamp is incremented with a 48000 Hz clock rate for all modes of Opus and all sampling rates. For data encoded with sampling rates other than 48000 Hz, the sampling rate has to be adjusted to 48000 Hz. and The media subtype ("opus") goes in SDP "a=rtpmap" as the encoding name. The RTP clock rate in "a=rtpmap" MUST be 48000, and the number of channels MUST be 2. The actual rate used is encoded as part of the Opus bit stream. It can be hinted towards with the various fmtp= parameters, but even that is optional. |