FEC packet loss

[DigitalOneThe]

How to properly configure FEC packet loss?
Do I need some additional packet loss processing in the code?

And what is the packet loss? I need the loss of network packets (audio data that is transmitted over the network).

Guide me on the right path.

Or is it the loss of the audio chunks themselves?

opus_encoder_ctl(encoder, OPUS_SET_BITRATE(64000));
opus_encoder_ctl(encoder, OPUS_SET_COMPLEXITY(8)); 
opus_encoder_ctl(encoder, OPUS_SET_VBR(1));
opus_encoder_ctl(encoder, OPUS_SET_SIGNAL(OPUS_SIGNAL_VOICE));
opus_encoder_ctl(encoder, OPUS_SET_INBAND_FEC(0));
opus_encoder_ctl(encoder, OPUS_SET_PACKET_LOSS_PERC(0));
opus_encoder_ctl(encoder, OPUS_SET_DTX(0));
opus_encoder_ctl(encoder, OPUS_SET_LSB_DEPTH(16));

opus_decoder_ctl(decoder, OPUS_SET_GAIN(0));

[jmvalin]

OPUS_SET_PACKET_LOSS_PERC(0) means you're telling the encoder "there's never any loss". Hence it's not going to use FEC. OPUS_SET_INBAND_FEC(0) also means "don't use FEC".