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Topic: Stuff for the AAC 96 kbps listening test (Read 24856 times) previous topic - next topic

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Stuff for the AAC 96 kbps listening test
Reply #25
There were 30 samples in previous test. Large number of samples helps to get more statistically valid results.
It was a good decision (not a coincidence). 
The only price to pay is some extra time for recollecting the samples.

So, there will be 20 samples in this test.


But it was a lower bitrate test. The higher the bitrate, the more difficult it is to spot differences and then people might lose interest if there are a lot of samples. Anyways, your decision.

  • hellokeith
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Stuff for the AAC 96 kbps listening test
Reply #26
Every suggestion has a down side.
It will be very difficult to classify artifacts. Somebody hears some temporal distortion other hears stereo issues.  The artifacts are rarely have a single nature.
We will have days and days of hot discussions and probably will end with the same situation as purely random choice.

I was thinking more along the lines of genre or type: music, spoken word, sample, effect, etc.
I don't think it would take that long to classify.. listen to a few seconds of each sample.  Besides, shouldn't someone be checking every sample anyways? To ensure it is a valid file and not corrupted or some joke.

  • IgorC
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Stuff for the AAC 96 kbps listening test
Reply #27
There were 30 samples in previous test. Large number of samples helps to get more statistically valid results.
So, there will be 20 samples in this test.


But it was a lower bitrate test. The higher the bitrate, the more difficult it is to spot differences and then people might lose interest if there are a lot of samples. Anyways, your decision.

I understand your fears. Some people told me it was insane to include 30 samples.
But a lot of listeners have participated in last test and there were a lot of results. 
Yes, it was 64 kbits and 30 samples.
It's not about being child but 20 samples are still affordable at 96 kbps. Encoders are good but artifacts are still easy distinguishable.

So, twenty, Sebastian, twenty. 
  • Last Edit: 10 July, 2011, 09:58:45 PM by IgorC

  • IgorC
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Stuff for the AAC 96 kbps listening test
Reply #28
To ensure it is a valid file and not corrupted or some joke.

Have you seen any corrupted, invalid or some joke files in previous public tests?
  • Last Edit: 11 July, 2011, 01:06:23 AM by IgorC

  • hellokeith
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Stuff for the AAC 96 kbps listening test
Reply #29
To ensure it is a valid file and not corrupted or some joke.

Have you seen any corrupted, invalid or some joke files in previous public tests?

A standard disclaimer in financial investments is that “past results do not guarantee future returns.” 

  • lvqcl
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  • Developer
Stuff for the AAC 96 kbps listening test
Reply #30
2 samples from Muse - Absolution:

1. [ Specified attachment is not available ] 10 last seconds of "Intro", then 17 seconds of "Apocalypse Please"

2. [ Specified attachment is not available ] 10 last seconds of "Interlude", then 20 seconds of "Hysteria"
  • Last Edit: 11 July, 2011, 04:18:08 PM by lvqcl

  • IgorC
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Stuff for the AAC 96 kbps listening test
Reply #31
I was thinking more along the lines of genre or type: music, spoken word, sample, effect, etc.

Yes, it will be sorted by musical genres, speech etc.


  • Diow
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Stuff for the AAC 96 kbps listening test
Reply #32
2 samples from Muse - Absolution:

1. (Attachment Link) 10 last seconds of "Intro", then 17 seconds of "Apocalypse Please"

2. Hysteria.flac: 10 last seconds of "Interlude", then 17 seconds of "Hysteria" {sorry, will be uploaded later}



Good samples, anyway they are almost the same isn't? Stereo effect, syntetised guitar, piano.
  • Last Edit: 11 July, 2011, 03:04:36 PM by Diow
Sorry for my bad english.

  • Alex B
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Stuff for the AAC 96 kbps listening test
Reply #33
Electronic music samples from my archive for testing high frequency fidelity. Apparently the encoders in this test use a low pass frequency of about 15 kHz. These samples have distinct high frequency content from about 13 kHz up to 20 kHz.

Some of the samples are also otherwise difficult (in addition to the more or less audible lowpass). I tested quickly Nero and Winamp/FhG (I didn't have time to configure and test the QuickTime encoder on this PC now). For example, Wild And Blue 1 is very difficult for Nero. FhG is better with this sample. On the other hand Go Jam And Spoon Mix is quite a killer to FhG. Nero handles it better.


Go Jam And Spoon Mix



[ Specified attachment is not available ]

Return Of The Tempel



[ Specified attachment is not available ]

Wild And Blue 1



[ Specified attachment is not available ]

Wild And Blue 2



[ Specified attachment is not available ]
  • Last Edit: 11 July, 2011, 05:09:43 PM by Alex B

  • IgorC
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Stuff for the AAC 96 kbps listening test
Reply #34
It also important to have a mixed class of samples (voice + music)

Example:


  • /mnt
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Stuff for the AAC 96 kbps listening test
Reply #35
Sample from Kraftwerk's Radio-Activity.

Creates pre-echo and tonality problems at low bitrates.
"I never thought I'd see this much candy in one mission!"

  • /mnt
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Stuff for the AAC 96 kbps listening test
Reply #36
-- Please delete --
  • Last Edit: 12 July, 2011, 11:27:15 PM by /mnt
"I never thought I'd see this much candy in one mission!"

  • IgorC
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Stuff for the AAC 96 kbps listening test
Reply #37
I remind that random selection of sample will be perfomed in less than 12 hours. (12:00 GMT -3) here http://rolz.org/?p=group# in looby room

Stuff for the AAC 96 kbps listening test
Reply #38
I remind that random selection of sample will be perfomed in less than 12 hours. (12:00 GMT -3) here http://rolz.org/?p=group# in looby room


Sorry, but did you mean lobby?

  • IgorC
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Stuff for the AAC 96 kbps listening test
Reply #39
Yes, my mistake.
And it will start in 10 minutes.

Stuff for the AAC 96 kbps listening test
Reply #40
Here is the final table of samples sorted by musical genre.

After the random selection this table (with selected samples marked) will by also uploaded to this thread.


Stuff for the AAC 96 kbps listening test
Reply #41
Here is the result of random selection.

The samples will be uploaded here within ~1 hour.


Stuff for the AAC 96 kbps listening test
Reply #42
Unfortunately for now I have some connection problems. Hopefully the samples will be uploaded today by /mnt.
  • Last Edit: 13 July, 2011, 01:28:20 PM by Steve Forte Rio

  • Alex B
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Stuff for the AAC 96 kbps listening test
Reply #43
  • Last Edit: 13 July, 2011, 01:33:02 PM by Alex B

  • nao
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Stuff for the AAC 96 kbps listening test
Reply #44
A CLI wrapper for enc_fhgaac.dll:
[ Specified attachment is not available ]

Stuff for the AAC 96 kbps listening test
Reply #45
A CLI wrapper for enc_fhgaac.dll:
(Attachment Link)


Great! Thank you very much, nao

Now we have access to every encoder through the command line.

Alex B, thanks. Uploading really wasn't necessary.

  • /mnt
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Stuff for the AAC 96 kbps listening test
Reply #46
Looks like the Pop / Rock section scored some good samples.

A CLI wrapper for enc_fhgaac.dll:
(Attachment Link)

Awesome, thanks!

Jerkin Back 'n Forth http://www.hydrogenaudio.org/forums/index....ost&id=6585

Are we not men?
"I never thought I'd see this much candy in one mission!"

  • Alex B
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Stuff for the AAC 96 kbps listening test
Reply #47
Thanks nao. It seems to work fine.

Are we not men?


A: We Are Devo!

  • IgorC
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Stuff for the AAC 96 kbps listening test
Reply #48
ABCHR configurations for verification

  • lvqcl
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  • Developer
Stuff for the AAC 96 kbps listening test
Reply #49
ctaacenc: a slightly modified version of  fhgaacenc that works with enc_aacplus.dll instead of enc_fhgaac.dll (this zip file doesn't include libsndfile DLL; copy it from fhgaacenc bundle).

[ Attachment Invalid Or Does Not Exist ]