IPB

Welcome Guest ( Log In | Register )

> Upload forum rules

- No over 30 sec clips of copyrighted music. Cite properly and never more than necessary for the discussion.


- No copyrighted software without permission.


- Click here for complete Hydrogenaudio Terms of Service

 
Reply to this topicStart new topic
Opus 1.1_ABX @ 199kbps, Sample easily ABX-ed at high bitrates
lothario15
post Jan 9 2015, 17:33
Post #1





Group: Members
Posts: 26
Joined: 3-November 14
Member No.: 117719



Sample: 15 seconds of track 4 from Radiohead's 'In Rainbows'.
Detail: static-like sounds accompanying bass instrument (between 0:03 and 0:05, also between 0:08 and 0:10) easily distinguishable.
Tested: Opus 1.1 @ 96, 128, 160 and 199kbps.
Attached File(s)
Attached File  1-04_WeirdFishes_sample.flac ( 1.87MB ) Number of downloads: 78
Attached File  1-04_WeirdFishes_sample_199.opus ( 391.09K ) Number of downloads: 93
 
Go to the top of the page
+Quote Post
IgorC
post Jan 11 2015, 17:10
Post #2





Group: Members
Posts: 1618
Joined: 3-January 05
From: ARG/RUS
Member No.: 18803



Interesting report.

Lothario, have You performed ABX test on this sample? Even if an issue is obvious it's still good to have a log of performed test.

Also this sample is very loud (as all modern CDs) and maybe the issue comes from there (clipping?). Dunno.


P.S. Ouch, now have seen "Sample easily ABX-ed at high bitrates". Well, anyway log would be nice smile.gif

This post has been edited by IgorC: Jan 11 2015, 17:20


--------------------
http://listening-test.coresv.net/results.htm
Go to the top of the page
+Quote Post
ChronoSphere
post Jan 11 2015, 18:45
Post #3





Group: Members
Posts: 632
Joined: 11-March 07
Member No.: 41384



Hm, I can't hear what you mean on my system, these sound the same to me. Tried going down with the bitrate, but all I hear is the cymbals getting smeary.
Go to the top of the page
+Quote Post
xnor
post Jan 11 2015, 19:22
Post #4





Group: Developer
Posts: 1415
Joined: 29-April 11
From: Austria
Member No.: 90198



Please post a log. Then we can investigate further.


--------------------
Sighted evaluation without blind testing is blind.
Go to the top of the page
+Quote Post
Kamedo2
post Jan 11 2015, 19:41
Post #5





Group: Members
Posts: 221
Joined: 16-November 12
From: Tokyo, Japan
Member No.: 104567



I reproduced the finding. Here is my log.
CODE
foo_abx 2.0 report
foobar2000 v1.3.6
2015-01-12 03:26:13

File A: 1-04_WeirdFishes_sample.flac
SHA1: e7663211690ce2eb0d7e70cdc4b2a8582af5d1b4
File B: 1-04_WeirdFishes_sample_199.opus
SHA1: 7ca517bdbf34d7f68eea7d99a2149e4ebc7d9501

Output:
DS : プライマリ サウンド ドライバー
Crossfading: NO

03:26:13 : Test started.
03:26:55 : 01/01
03:27:18 : 02/02
03:27:41 : 03/03
03:27:56 : 04/04
03:28:31 : 05/05
03:28:52 : 06/06
03:29:13 : 07/07
03:29:25 : 08/08
03:29:50 : 09/09
03:30:01 : 10/10
03:30:16 : 11/11
03:30:46 : 12/12
03:31:03 : 13/13
03:31:35 : 14/14
03:31:57 : 15/15
03:31:57 : Test finished.

----------
Total: 15/15
Probability that you were guessing: 0.0%

-- signature --
e0c6eb8f7f237c81a539dd8da8fddb0490fd4994

I have to say that the difference is subtle; the buzzer like tone B sound from right, 0:04 is more buzzy and fuzzy in the Opus sample.
Go to the top of the page
+Quote Post
lothario15
post Jan 11 2015, 21:18
Post #6





Group: Members
Posts: 26
Joined: 3-November 14
Member No.: 117719



Apologies, I tested at a variety of rates (96, 128, 160 and 199) so didn't keep the original logs to post. Fortunately, I had the same equipment with me this evening (Sony MDR-7506 headphones plugged directly into my ThinkPad X220 work laptop) so was able to re-do the 199kbps test.

As before, the lossless file has a static-like sound in the right channel between 0:03 and 0:05 and, to a slightly lesser extent, between 0:08 and 0:10. This sound is diminished in the Opus file.

Oddly, I scored 10/10 first time but failed a single instance this time around. Perhaps I should have refrained from using the term 'easily' in the sub-heading. Anyway, here's the log of tonight's test:

CODE
foo_abx 1.3.4 report
foobar2000 v1.3.6
2015/01/11 19:38:17

File A: C:\Users\ThinkPad\Downloads\1-04_WeirdFishes_sample.flac
File B: C:\Users\ThinkPad\Downloads\1-04_WeirdFishes_sample_199.opus

19:38:17 : Test started.
19:38:56 : 01/01  50.0%
19:39:10 : 02/02  25.0%
19:40:00 : 03/03  12.5%
19:40:55 : 04/04  6.3%
19:42:34 : 05/05  3.1%
19:43:40 : 06/06  1.6%
19:44:35 : 07/07  0.8%
19:46:01 : 08/08  0.4%
19:48:00 : 09/09  0.2%
19:52:04 : 09/10  1.1%
19:52:40 : 10/11  0.6%
19:53:07 : 11/12  0.3%
19:53:46 : 12/13  0.2%
19:54:52 : 13/14  0.1%
19:55:32 : 14/15  0.0%
19:56:23 : 15/16  0.0%
19:56:25 : Test finished.

----------
Total: 15/16 (0.0%)

Attached File(s)
Attached File  Test_result.txt ( 677bytes ) Number of downloads: 52
 
Go to the top of the page
+Quote Post
Brand
post Jan 11 2015, 23:02
Post #7





Group: Members
Posts: 326
Joined: 27-November 09
Member No.: 75355



Here's my quick attempt, using speakers:
CODE
foo_abx 2.0 report
foobar2000 v1.3.6
2015-01-11 22:38:44

File A: 1-04_WeirdFishes_sample.flac
SHA1: e7663211690ce2eb0d7e70cdc4b2a8582af5d1b4
File B: Weird Fishes-Arpeggi.opus
SHA1: a4f9457598d2851f377c0c9aa5c8665cf394d438

Output:
DS : Primary Sound Driver
Crossfading: NO

22:38:44 : Test started.
22:39:10 : 01/01
22:39:24 : 02/02
22:39:59 : 03/03
22:40:28 : 03/04
22:40:54 : 03/05
22:41:32 : 04/06
22:41:47 : 05/07
22:42:06 : 06/08
22:42:16 : 07/09
22:42:41 : 08/10
22:43:56 : 09/11
22:44:04 : 10/12
22:44:15 : 11/13
22:44:20 : 12/14
22:44:25 : 13/15
22:44:49 : 14/16
22:44:49 : Test finished.

  ----------
Total: 14/16
Probability that you were guessing: 0.2%

  -- signature --
767f88ae4ab963ccb2227a2ea3fd05381a5cddcb


I can't say exactly what it is, the original just sounds somewhat louder and clearer. Though when I compare them with ReplayGain, they show the same track gain and a higher peak in the Opus version.

BTW, I made my own Opus (199k) from the Flac, uploaded here.
Attached File(s)
Attached File  Weird_Fishes-Arpeggi.opus ( 391.09K ) Number of downloads: 16
 
Go to the top of the page
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 5th May 2015 - 02:34