Technical Specs for Audio Backchannel Support

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Nov 3, 2023
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Hi. I'm trying to get RTSP backchannel working. I believe I'm correctly understanding and applying the SDP, but I'm also well aware that backchannel support is a bit of the wild west. Does anyone have any insight into the specific audio codec / sample rate / encoding details used by any popular camera brand (Dahua/Lorex, Hikvision, in particular)?

I have a wide variety of cameras available to me. I can get growling noises to play which tells me that I'm (probably) talking RTP correctly, but the audio data is not what the camera expects. Probably.

Any insight for any particular camera would be appreciated.
 
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