[opus] Using FEC

[Elinor Alpay]

Hi,

I'm trying to use the FEC feature.
I have a service which does the encoding with OPUS_SET_INBAND_FEC(1)
and OPUS_SET_PACKET_LOSS_PERC(20) with 10ms packets.

I'm not clear on the decoding process though.
1- When a packet is lost, do I need to call decode with fec=1 ONLY or do I
need to call decode with fec=0 after as well?
2- How do I know up front the size of the pcm that I send to decode with
fec enabled?

Thanks,
Elinor
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