[opus] recommended opus bitrate / opusenc setting for general?

Thomas Daede tdaede at mozilla.com
Sat Oct 24 22:16:02 PDT 2015

Everything above 96kbps on that table is speculative, as the highest
multi-participant listening testing done was at 96kbps. Here's the
results from that test, if you're curious:


As you can see, at that rate Opus ranged from slightly perceptible to
imperceptible. Also importantly, note how few of the donors were able to
give significant results on most tracks. This makes a 128kbps or higher
test impractical as there would not be enough listeners capable of
hearing a difference. The HydrogenAudio wiki should probably be updated

FWIW I cannot ABX 96kbps Opus from lossless, so that's what I use for
music storage on my portable player.

On 10/24/2015 09:01 PM, Christoph Anton Mitterer wrote:
> Hey.
> I just wondered,... which is the recommended bitrate and further
> settings of opusenc (like complexity and framesize) for general music
> (e.g. including classical music) to achieve more or less transparency?
> Talking about CD level audio (16bit; 44,1 kHz; Stereo)
> The only source I could find regarding that was:
> http://wiki.hydrogenaud.io/index.php?title=Opus#Music_encoding_quality
> But that seems to imply that transparency is achieved with 256bit...
> and "close to transparency" wit 128bit... and then I wonder why one
> would need Opus, because I thought that's about the same for
> AAC/MP3/Vorbis.
> Cheers,
> Chris.
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> opus at xiph.org
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