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Topic: Possible Lossy Killer Sample (Read 6778 times) previous topic - next topic
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Possible Lossy Killer Sample

I have used this track for years on must ABX tests and it is the track that made my realise that 192kbps J/S Mp3 was not transparent and also every lossy format chokes at it on 128kbps CBR + ABR on a personal ABX test i did a few years ago.

I think this is a killer sample on Nero AAC becuase it is easy to ABX at q 0.5 and faild to ABX it on LAME 3.97 -V3 --vbr-new 

ABX results:

foo_abx 1.3.1 report
foobar2000 v0.9.4.3
2007/08/15 21:45:13

File A: E:\Misc\Black Sabbath - Iron Man.mp4
File B: E:\Misc\Wave\Black Sabbath - Iron Man.wav

21:45:13 : Test started.
21:46:06 : 01/01  50.0%
21:46:48 : 02/02  25.0%
21:47:57 : 03/03  12.5%
21:49:30 : 04/04  6.3%
21:51:04 : Test finished.

----------
Total: 4/4 (6.3%)

Iron Man sample:
http://www.sendspace.com/file/6t1vb1
"I never thought I'd see this much candy in one mission!"

Possible Lossy Killer Sample

Reply #1
Which CD did you get this song off of?  Was it the original release of "We Sold Our Souls For Rock N Roll" or the remastered version?  What about the original release of "Paranoid" or the remastered version?  Did you get it off of another greatest hits album?

Possible Lossy Killer Sample

Reply #2
Which CD did you get this song off of?  Was it the original release of "We Sold Our Souls For Rock N Roll" or the remastered version?  What about the original release of "Paranoid" or the remastered version?  Did you get it off of another greatest hits album?

It is from the 2004 Sanctuary remaster of Paranoid.
"I never thought I'd see this much candy in one mission!"

Possible Lossy Killer Sample

Reply #3
6.3 % doesn't pass as valid abx. Not saying you can't abx but can people at least try for 3 % or better ?
wavpack hybrid 256k -hx4

Possible Lossy Killer Sample

Reply #4
Code: [Select]
Duration : 0:30.000 (1323000 samples)
Sample Rate : 44100 Hz
Channels : 2
Bitrate : 175 kbps
Codec : AAC
Codec Profile : AAC LC
Encoding : lossy
Tool : Nero AAC codec / Aug  6 2007



foo_abx 1.3.1 report
foobar2000 v0.9.4.2
2007/08/16 02:38:25

File A: C:\temp\iron_man.flac
File B: C:\temp\iron_man.mp4

02:38:25 : Test started.
02:38:44 : 01/01  50.0%
02:38:49 : 02/02  25.0%
02:38:54 : 03/03  12.5%
02:38:56 : 04/04  6.3%
02:38:59 : 05/05  3.1%
02:39:01 : 06/06  1.6%
02:39:04 : 07/07  0.8%
02:39:06 : 08/08  0.4%
02:39:09 : 09/09  0.2%
02:39:11 : 10/10  0.1%
02:39:13 : 11/11  0.0%
02:39:19 : 12/12  0.0%
02:39:21 : Test finished.

 ----------
Total: 12/12 (0.0%)

ABX position: from 11.1 seconds
Artefact: additional noise on the artificial "fatboy" voice. Easy to spot

Possible Lossy Killer Sample

Reply #5
6.3 % doesn't pass as valid abx. Not saying you can't abx but can people at least try for 3 % or better ?

Yeah sorry about that, I just only did a quick and and simple ABX on this sample
"I never thought I'd see this much candy in one mission!"

Possible Lossy Killer Sample

Reply #6
Taken into account. Will be checked. Thank you for finding this one.

p.s. For future to all people that help us find killer samples: can you please extract shorter parts that produce artifacts. Long samples are problematic because it might happen that it sounds perfect in 90% of duration and that there is only short artifact. This makes tuning of encoder hard. Maybe 5-10s. Thank you.

 
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