[opus] OPUS vs MP3

[encrupted anonymous]

Good morning.

I've ran a test against MP3 format.

Code: (first convert tested audio file to 16 bit 48khz with sox.exe if
needed)
lame.exe -b 320 48khzfilein.wav -o fileout.mp3
lame --decode fileout.mp3 -o fileout.mp3.wav
opusenc.exe --bitrate 320 48khzfilein.wav fileout.opus
opusdec.exe fileout.opus fileout.opus.wav
wavdiff.exe 48khzfilein.wav fileout.mp3.wav -diff fileout.mp3.delta.wav
wavdiff.exe 48khzfilein.wav fileout.opus.wav -diff fileout.opus.delta.wav

Results: (compare two deltas with spek.exe - i've attached graphic file
from my test)
MP3 much better at 0-4 kHz, Opus little better at 12-20 kHz.
Plus I think 0-4 kHz is more important than 12-20.

Current Opus 1.2.1 is the best at 32 kbit/s for music.
But if you input 44100 Hz audio and give 96-512 kbit/s, Opus pretty badly
spends that much bitrate because of frame rate conversion.

That's all I wanted to say for now, good evening.

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