[opus] Question on Opus UDP payload

Jean-Marc Valin jmvalin at jmvalin.ca
Wed Apr 27 21:11:03 UTC 2016

I assume that by "UDP payload", you mean RDP payload. In that case, you
can find all the info you need in RFC 7587:



On 03/09/2016 10:36 AM, aj wrote:
> Hi there,
> Im trying to understand the structure of an opus UDP payload. Recently i
> capture a test audio containing opus codec.
> I notice that some packets contains the same number of payload
> block.(e.g.58 bytes) When i look at the UDP data i see the first few
> four bytes were having these hex representation, 0x0d 0x80 0x5d 0xeb
> Can someone explain to me the meaning of the first four bytes in the UDP
> payload for opus.
> Im sorry if my question seems to be naive but im just curious about opus
> codec and the mechanism behind.
> Thank you. Hope to hear your response.
> Regards.
> AJ
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