Re: Nontransparent example at 231kbps
Reply #1 – 2021-05-01 12:02:34
Killer samples are accepted. In this case it's rather a synthetic/generated sound — and these kind of samples are more a proof of concept than a real annoyance for users. The Opus file you joined in your 7z archives is named "105kbps" and the output bitrate is 231 kbps as you mention it in the title. Correct me if I'm wrong, but you probably set Opus to 105 kbps. As Opus usually use much more bit with highly tonal sample, you get a very high bitrate on this short piece of sound. In other words you find an artifact with opus -105 and not with opus -231. That makes a big difference. Indeed, while Opus at ~100 kbps is usually transparent some artifacts may be audible (especially on very special sounds like this one). If I understand you description correctly you hear an artifact on the exact moment of the light "clic" of the ToneClick sample. Do you also ear the alteration of the tonal sound? Can you ABX Tone.wav vs Tone.opus? Because I hear a very strong alteration of the whole sample (with or without clic):foo_abx 2.0.6d report foobar2000 v1.6.6 beta 4 2021-05-01 12:54:07 File A: tone.wav SHA1: 561ecac961f6714ef9de05d8ff52db97e2351eb7 Gain adjustment: -1.40 dB File B: tone.opus SHA1: 3fd43651750a075f01e76f63317a2b57261334c6 Gain adjustment: -1.42 dB Output: Default : Primary Sound Driver Crossfading: NO 12:54:07 : Test started. 12:54:12 : 01/01 12:54:22 : 02/02 12:54:26 : 03/03 12:54:30 : 04/04 12:54:33 : 05/05 12:54:37 : 06/06 12:54:41 : 07/07 12:54:46 : 08/08 12:54:46 : Test finished. ---------- Total: 8/8 p-value: 0.0039 (0.39%) -- signature -- c9491f26aad31218d75b5d8cd7f4fc140af999a2 In this test Tone.wav was encoded at 105 kbps (final bitrate: 231 kbps as well). So no clic but obvious difference to my ears. Cheers!