<div dir="auto"><div>As far as your testing goes, doesn't seems to be a problem to me.<div dir="auto"><br></div><div dir="auto">Since opus is a lossy compressor designed for human hearing, looking at spectral analysis and difference between original and encoded audio seems of little relevance for Opus purpose.</div><div dir="auto"><br></div><div dir="auto">If you could tell apart the Opus file at that bitrate and the original file in a double blind test, then it would be a finding worthy of investigation.</div><br><div class="gmail_extra"><br><div class="gmail_quote">Em 30 de out de 2017 6:03 PM, "encrupted anonymous" <<a href="mailto:sergeinakamoto@gmail.com">sergeinakamoto@gmail.com</a>> escreveu:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Good morning.<div><br></div><div>I've ran a test against MP3 format.<br></div><div><br></div><div>Code: (first convert tested audio file to 16 bit 48khz with sox.exe if needed)</div><div>lame.exe -b 320 48khzfilein.wav -o fileout.mp3</div><div>lame --decode fileout.mp3 -o fileout.mp3.wav<br></div><div>opusenc.exe --bitrate 320 48khzfilein.wav fileout.opus</div><div>opusdec.exe fileout.opus fileout.opus.wav<br></div><div>wavdiff.exe 48khzfilein.wav fileout.mp3.wav -diff fileout.mp3.delta.wav</div><div>wavdiff.exe 48khzfilein.wav fileout.opus.wav -diff fileout.opus.delta.wav<br></div><div><br></div><div>Results: (compare two deltas with spek.exe - i've attached graphic file from my test)<br></div><div>MP3 much better at 0-4 kHz, Opus little better at 12-20 kHz.</div><div>Plus I think 0-4 kHz is more important than 12-20.</div><div><br></div><div>Current Opus 1.2.1 is the best at 32 kbit/s for music.<br></div><div>But if you input 44100 Hz audio and give 96-512 kbit/s, Opus pretty badly</div><div>spends that much bitrate because of frame rate conversion.</div><div><br></div><div>That's all I wanted to say for now, good evening.</div></div><div id="m_-6923562015899162786DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br> <table style="border-top:1px solid #d3d4de">
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