Skip to main content


Please note that most of the software linked on this forum is likely to be safe to use. If you are unsure, feel free to ask in the relevant topics, or send a private message to an administrator or moderator. To help curb the problems of false positives, or in the event that you do find actual malware, you can contribute through the article linked here.
Topic: I Think I found a problem (Read 3647 times) previous topic - next topic
0 Members and 1 Guest are viewing this topic.

I Think I found a problem

(Since Musepack doesn't appear to have much going on I've been re-doing parts of my stash into Ogg, since my flash player supports it and I won't have to store duplicates in both MPC and Ogg/mp3 files for compatibility.)

While listening to an encode of New World Man by Rush I heard something that wasn't right in the opening... I can't really explain it very well, but it's some kind of distortion or smeared, hollow-sounding pre-effect (like brushing across corduroy).  I can ABX it distinctly up to -q10! (16/16).

I took the first 6 seconds or so of the intro and used that, although the artifact is present in the first 500ms, which is where I tested.

Samples here:

Code: [Select]
foo_abx v1.2 report
foobar2000 v0.8.3
2006/05/21 23:11:42

File A: file://C:\Documents and Settings\Primary Login\Desktop\NewWorldMan[orig].wav
File B: file://C:\Documents and Settings\Primary Login\Desktop\NewWorldMan[OggEnc283-q10].ogg

23:11:42 : Test started.
23:12:19 : 01/01  50.0%
23:13:01 : 02/02  25.0%
23:13:16 : 03/03  12.5%
23:13:25 : 04/04  6.3%
23:13:32 : 05/05  3.1%
23:13:54 : 06/06  1.6%
23:14:07 : 07/07  0.8%
23:14:13 : 08/08  0.4%
23:14:25 : 09/09  0.2%
23:14:35 : 10/10  0.1%
23:14:44 : 11/11  0.0%
23:14:54 : 12/12  0.0%
23:15:06 : 13/13  0.0%
23:15:18 : 14/14  0.0%
23:15:29 : 15/15  0.0%
23:15:40 : 16/16  0.0%
23:15:42 : Test finished.

Total: 16/16 (0.0%)

I first noticed it using aoTuVb4 a while back at -q3 and didn't bother to think much of it until I tried aoTuVb4b/LancerSSE2 -q5.5 and noticed it wasn't a lot better. (since -q5 is considered to be transparent I thought I'd better bring this up for discussion) I used OggEnc v2.83 "" to generate the -q10 file since I wanted to make sure it wasn't some ICL compiler/SSE2 issue.


I Think I found a problem

Reply #1
Your results are interesting. Could you please post your findings at the official vorbis dev list?
Join // to promote Vorbis, FLAC, Speex, etc