[opus] Even lower latency for wireless radio mics
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:
> 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
> opus mailing list
> opus at xiph.org
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