On 04-12-2023 18:04, Aditya Dandavate wrote:
On Mon, 4 Dec, 2023, 10:27 pm Ferdi Scholten, <fe...@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 ?
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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.
With my 5 year old laptop (kaby lake based intel i7-8650U 1.9 GHz base,
low power quadcore), opus encoding with ffmpeg at highest quality
settings (-compression_level 10) has no problems encoding stereo input
in realtime. I suggest to try different quality levels and use the best
your hardware supports while keeping up with realtime encoding.
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