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Opus v1.1 @ 199 kbps vs FLAC (ABX)
matthaeus
post Dec 17 2013, 23:34
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Result of libOpus 1.1 @ 199 kbps (160 nominal) vs FLAC ABX listening test, using a problematic sample (converted from MIDI).

CODE
foo_abx 1.3.4 report
foobar2000 v1.2.9
2013/12/17 21:47:40

File A: D:\Documents\fuga1.flac
File B: D:\Documents\fuga1.opus

21:47:40 : Test started.
21:49:32 : 01/01 50.0%
21:50:11 : 02/02 25.0%
21:50:45 : 03/03 12.5%
21:51:23 : 04/04 6.3%
22:18:49 : 05/05 3.1%
22:19:50 : 06/06 1.6%
22:21:11 : 07/07 0.8%
22:23:11 : Test finished.

----------
Total: 7/7 (0.8%)

Attached File(s)
Attached File  fuga1.flac ( 2MB ) Number of downloads: 160
Attached File  fuga1.opus ( 726.9K ) Number of downloads: 104
 
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TheBashar
post Dec 29 2013, 10:02
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QUOTE (matthaeus @ Dec 17 2013, 14:34) *
Result of libOpus 1.1 @ 199 kbps (160 nominal) vs FLAC ABX listening test, using a problematic sample (converted from MIDI).


Could you please describe the problem that you hear.
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matthaeus
post Dec 29 2013, 11:55
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A low-frequency compression artifact is present, similar to wind noise. You can hear it at lower bitrates more easily (~96kbps sample attached). It can be heard when using other lossy encoders, too, but opus was the worst on this sample.
Besides, a whispering effect is added to the oboe, and can be easily heard at 0:21.
I hope these issues will be corrected soon, opus is a really promising codec.
Thanks,
Matt
Attached File(s)
Attached File  fuga1-96k.opus ( 390.28K ) Number of downloads: 54
 
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