[FFmpeg-user] Question about libopus encoding.

[Aditya Dandavate]

On Mon, 4 Dec, 2023, 10:27 pm Ferdi Scholten, <ferdi at sttc-nlp.nl> wrote:

> *cap_soundcommand* "ffmpeg -f s16le -ar %s -ac 2 -i - -c:a libopus -vbr on
> > -compression_level 0 -application lowdelay -b:a 128k -y temp_a.nut"
> >
> > Is this VBR encoding, is `-b:a 128k` the average bitrate or
> maximum/minimum
> > allowed bitrate ?
> > _______________________________________________
> It is vbr recording with an average bitrate of 128k
>
> You further restrict the encoder optimizations (with -application
> lowdelay, which tries to eliminate the lowest quality encoding modes)
> which might (or not) also lead to lesser quality and almost certainly to
> bigger then needed encodes. (The opus api documentation specifically
> states to use it with caution...)
>
> You can omit -vbr on as it is the default setting.
>

Okay. I will change to `application audio` as it is better (faithfulness to
the audio).

I need realtime encoding so I put -compression_level 0 to enable fast
encoding speed.

Thanks.

>