[opus] encoder with FEC+DTX enabled but not detecting noise

Suresh Thiriveedi sthiriveedi at gmail.com
Wed Oct 5 10:01:59 UTC 2016


I changed the VAD sensitivity by varying VAD_SNR_FACTOR_Q16 and now it
shows the difference in silence frames.


On 4 October 2016 at 17:57, Suresh Thiriveedi <sthiriveedi at gmail.com> wrote:

> Hi,
> When we pass around 9K samples of only ambient noise (no voice), the
> encoder which is enabled FEC+DTX is detecting only some 140 frames as
> non-voice (returning only TOC, no frame content). We were expecting all or
> more to be identified as non-voice.
> Our idea was to check how the decoder re-generates the original ambient
> noise during the silence duration (when we feed NULL to decoder) when the
> FEC+DTX enabled.
> Please clarify.
> Thanks
> Suresh
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