[opus] Even lower latency for wireless radio mics

Jean-Marc Valin jmvalin at jmvalin.ca
Fri Jun 14 23:30:54 PDT 2013


Sorry about the large delay -- just cleaned up the mailing list queue.
Yes, it is possible to go below 5 ms delay by using custom modes. The
limit is around 1.25 ms frame size + 1.2 lookahead, so 2.5 ms total.


On 03/14/2013 06:30 AM, Simon Blandford wrote:
> Hi,
> Live audio (especially music) applications usually need a total latency 
> of less than 5ms. Correct me if I am wrong but the minimum latency of 
> the Opus codec is 2.5ms (encoder) + 2.5ms (decoder) = 5ms? Is there any 
> way to go down to, say 1.25ms frame size?
> One characteristic of wireless radio mic links, if that helps, is that 
> they usually only need a frequency response from 50Hz to 20KHz rather 
> than the usual 20Hz to 20KHz.
> Bending the code out of spec is acceptable in this particular 
> application because it is normal for radio mic transmitters to be paired 
> with matching receivers from the same manufacturer.
> I would be interested to hear the opinion of the developers to get an 
> idea if codec could be used in live applications.
> Thanks & regards
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