Question about DRED about opus HOT 4 CLOSED

Opus is trying to optimize for whatever packet loss rate you set with OPUS_SET_PACKET_LOSS_PERC. If you tell it to optimize for the no-loss (0%) case, then there's no point in wasting bits for DRED. The exact loss you specify will influence the amount of DRED used. If in doubt, you can always try with 20% and see from there.
As for your third question, I don't understand it.

from opus.

Thanks a lot, that explains it. From my previous understanding, OPUS_SET_PACKET_LOSS_PERC was only relevant for LBRR, so that hadn‘t been obvious for me from the documentation.

Regarding my third question. The docs state: „ OPUS_SET_DRED_DURATION: If non-zero, enables Deep Redundancy (DRED) and use the specified maximum number of 10-ms redundant frames.“

Do I interpret it correctly that if I set this value to 50, I get 500ms of DRED data per frame, even if I choose to encode frames of 20ms or 5ms length?

I also noticed from experimenting that the amount of DRED data (in milliseconds) available is limited by bitrate, is that correct?

from opus.

OPUS_SET_DRED_DURATION is always in units of 10 ms, but things are more complicated underneath anyway. And it specifies the maximum the application allows. There may be less than that due to available bitrate.

from opus.

Thanks, that's all I needed to know!

from opus.