Well, some may have seem this already. I decided to redo it again (I forgot to make the tracks shorter than 30s and I couldn't edit the post anymore. xd).
Anyway, here are the results:
AAC (Qaac 2.49):
foo_abx 2.0.2 report
foobar2000 v1.3.11
2016-08-22 01:54:01
File A: 18. Anea Landing short.flac
SHA1: 0da3ad16de4d4ddc4f5f2e1b7d9a0c92f526b99e
File B: 18. Anea Landing short.m4a
SHA1: 13ae1a639e6bf5a0194267dfdfbae70ca2dd8da3
Used DSPs:
Resampler (dBpoweramp/SSRC)
Output:
DS : Speakers (ASUS Xonar DG Audio Device)
Crossfading: NO
01:54:01 : Test started.
01:54:18 : 01/01
01:54:25 : 02/02
01:54:33 : 03/03
01:54:43 : 04/04
01:55:04 : 05/05
01:55:10 : 06/06
01:55:16 : 07/07
01:55:36 : 08/08
01:55:55 : 09/09
01:56:46 : 10/10
01:56:46 : Test finished.
----------
Total: 10/10
Probability that you were guessing: 0.1%
-- signature --
bfe6e03e538995f5ce266026258c21c1def57cff
Opus (libopus 1.1):
foo_abx 2.0.2 report
foobar2000 v1.3.11
2016-08-22 01:40:30
File A: 18. Anea Landing short.flac
SHA1: 0da3ad16de4d4ddc4f5f2e1b7d9a0c92f526b99e
File B: 18. Anea Landing short.opus
SHA1: fc74e5273b414c896b7f4b0544f354a91b474db6
Used DSPs:
Resampler (dBpoweramp/SSRC)
Output:
DS : Speakers (ASUS Xonar DG Audio Device)
Crossfading: NO
01:40:30 : Test started.
01:41:02 : 01/01
01:41:17 : 02/02
01:41:42 : 03/03
01:41:56 : 04/04
01:42:17 : 05/05
01:42:30 : 06/06
01:42:37 : 07/07
01:43:03 : 08/08
01:43:13 : 09/09
01:43:21 : 10/10
01:43:21 : Test finished.
----------
Total: 10/10
Probability that you were guessing: 0.1%
-- signature --
7af75876b4371abc1f94af074e0e766f259b16a5
Vorbis (Oggenc 2.88 w/libVorbis 1.3.5) This time I actually managed to get 9/10, honestly, there was luck here xd:
foo_abx 2.0.2 report
foobar2000 v1.3.11
2016-08-22 01:44:03
File A: 18. Anea Landing short.flac
SHA1: 0da3ad16de4d4ddc4f5f2e1b7d9a0c92f526b99e
File B: 18. Anea Landing short.ogg
SHA1: e910aac63c8dac821ba9c200ffc0868a2fb8b46e
Used DSPs:
Resampler (dBpoweramp/SSRC)
Output:
DS : Speakers (ASUS Xonar DG Audio Device)
Crossfading: NO
01:44:03 : Test started.
01:44:36 : 01/01
01:44:43 : 02/02
01:44:51 : 03/03
01:45:00 : 04/04
01:45:12 : 05/05
01:45:22 : 06/06
01:45:39 : 07/07
01:45:57 : 08/08
01:46:14 : 09/09
01:46:25 : 09/10
01:46:25 : Test finished.
----------
Total: 9/10
Probability that you were guessing: 1.1%
-- signature --
35305a06e37bb24d38de0c83c5dfda01624999fe
The trick is that at the very beginning there's a big cymbal that's intermediately followed by a hi-hat, at that moment, while the hi-hat is partially masked by the cymbal, AAC highs sound muffled, Opus sounds a bit better, and with Vorbis the difference is so miserable that I still can't believe that I managed to get 9/10 (Before my best results was 7/10).