Stuff for the AAC 96 kbps listening test 2011-07-06 18:08:19 A bitrate table in Excel format (zipped).[attachment=6581:Bitrates...test.xls.zip]The related post: http://www.hydrogenaudio.org/forums/index....st&p=762128
Stuff for the AAC 96 kbps listening test Reply #2 – 2011-07-06 22:52:02 Another bitrate table.EDIT: Uploaded updated table Last Edit: 2011-07-06 23:47:42 by /mnt
Stuff for the AAC 96 kbps listening test Reply #3 – 2011-07-07 00:38:13 At 96kpbs - 100kbps Nero, FhG and QT has trouble with this sample.
Stuff for the AAC 96 kbps listening test Reply #4 – 2011-07-07 05:26:28 Dream Theater track "These Walls" from the album Octavarium, sample range is 2:34 - 3:04.Nero -q 0.345 - The cymbal stereo imaging gets messy, not too difficult to ABX with headphones:
Stuff for the AAC 96 kbps listening test Reply #5 – 2011-07-07 10:42:17 High frequency and total detalization loss for all AAC encoders under test (except FhG - it gives very high bitrate, so there is a little High Frequencies lost).
Stuff for the AAC 96 kbps listening test Reply #6 – 2011-07-07 15:37:55 A yet another sharp transient problem sample.However this sample gives each encoder it's characteristics. For example Nero does terrible with the low freq transients while sounding fine with the high freq one; Quick Time does ok with the low freq transients, but tremolo disortion appears during or after the high freq transients appear.
Stuff for the AAC 96 kbps listening test Reply #7 – 2011-07-08 07:56:48 The previous posts show why samples had to be chosen long time before even thinking of the listening test organization.I hope that at least some random process for choosing final samples will be involved. For example using some public lottery as I suggested long time ago:http://www.hydrogenaudio.org/forums/index....showtopic=64991 Last Edit: 2011-07-08 07:57:05 by muaddib
Stuff for the AAC 96 kbps listening test Reply #8 – 2011-07-08 10:19:08 It's interesting idea.A simple solution will be online dice-roller.http://rolz.org/?p=group#/mnt and Steve Forte Rio probably could make a list with 100-200 samples. Then we all (interested in this test) will enter into chat with dice-roler function and will start to roll the dice. What do you think?Seems very good to me. Hell, I like it. Last Edit: 2011-07-08 10:23:02 by IgorC
Stuff for the AAC 96 kbps listening test Reply #9 – 2011-07-08 23:09:41 Quote from: muaddib on 2011-07-08 07:56:48The previous posts show why samples had to be chosen long time before even thinking of the listening test organization.How many samples at minimum do we think the test will need?
Stuff for the AAC 96 kbps listening test Reply #11 – 2011-07-09 07:52:58 20 samples is quite a lot depending on the quality of the encoders.
Stuff for the AAC 96 kbps listening test Reply #12 – 2011-07-09 09:33:47 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.As of random choice of samples. /mnt and Steve Forte Rio will prepare the list with large number of samples (from previous tests, upload section, samples of other members etc..) and the random choice will be performed online here http://rolz.org/?p=group#We will define the time of this event shortly.All members and developers can participate.People, please, submit your samples (untill tuesday).Also it will be better to indicate the interval. For example the sample can have 30 seconds of the lenght but more interesting part is between 14-22 seconds.
Stuff for the AAC 96 kbps listening test Reply #13 – 2011-07-09 10:07:38 Well, here is some samples from my collection. Most of them causes pre-echo, the last sample is for stereo image testing (better listen through the loudspeakers).tiesto-athena.flac (13-28s)tiesto-do_you_feel_me.flac (1-21s)tydi-meet_me_in_kyoto.flac (first 15s)(genre: electronica)above_and_beyond-on_a_good_day.flac (first 15s)(genre: electronica/vocal trance)And more:Sound Expert nine samples:bachjs.flacbass.flaccastanets.flacfrmalspeech.flacglockenspiel.flacharpsichord.flaclofi.flacmoldfield.flacquartet.flac Last Edit: 2011-07-09 10:32:33 by Steve Forte Rio
Stuff for the AAC 96 kbps listening test Reply #14 – 2011-07-09 11:33:28 Great, SFR.It will be random choice so it's ok to include a pile of samples fromhttp://rarewares.org/test_samples/http://ff123.net/samples.htmlRoberto's and Sebastian's tests http://listeningtests.t35.com/http://membres.multimania.fr/guruboolez/AUDIO/Upload section http://www.hydrogenaudio.org/forums/index.php?showforum=35http://www.mp3-tech.org/tests/aac_48/samples/ Last Edit: 2011-07-09 11:44:34 by IgorC
Stuff for the AAC 96 kbps listening test Reply #15 – 2011-07-09 11:47:25 The quality of ffmpeg @128kbps isn't low enough, IMHO.
Stuff for the AAC 96 kbps listening test Reply #16 – 2011-07-09 11:56:06 What settings do you use?http://www.hydrogenaudio.org/forums/index....st&p=761300 ffmpeg -i file -acodec aac -ab 128k -strict experimental file.m4aif it will be necesarry we can lower the bitrate to 96 kbps if the quality will be too high for low anchor.This time low anchor shouldn't be that bad as in previous test. (I've tried ffmpeg's AAC 128 kbps on several samples and it was very bad)
Stuff for the AAC 96 kbps listening test Reply #17 – 2011-07-09 17:46:39 These 2 samples don't do too well with AAC at low bitrates.Does anyone have a list and links to the samples that was used on the recent 64kbps listening test?
Stuff for the AAC 96 kbps listening test Reply #18 – 2011-07-09 20:47:49 Another one sample from my music library. Causes high freq losses and signal correlated noise in some cases.Aria_Finch_han_dal_vino.flac(Symphonic orchestra + male vocal)2lvqclTry to encode this sample with ffmpeg (parameters given above) and you will hear that it's encoding quality is low enough QuoteIt will be random choice so it's ok to include a pile of samples fromhttp://rarewares.org/test_samples/http://ff123.net/samples.htmlRoberto's and Sebastian's tests http://listeningtests.t35.com/http://membres.multimania.fr/guruboolez/AUDIO/Upload section http://www.hydrogenaudio.org/forums/index.php?showforum=35http://www.mp3-tech.org/tests/aac_48/samples/Thank you! I'm going to post a large list of samples from this locations tomorrow (hopefully, I'll get the direct links). In order to have them all at one place, here Last Edit: 2011-07-09 21:09:51 by Steve Forte Rio
Stuff for the AAC 96 kbps listening test Reply #19 – 2011-07-09 21:16:30 Quote from: /mnt on 2011-07-09 17:46:39Does anyone have a list and links to the samples that was used on the recent 64kbps listening test?First 15 samples of them are from previous public test (2007)http://www.hydrogenaudio.org/forums/index....st&p=749072http://listening-tests.hydrogenaudio.org/i...all_samples.zip1.poets of the fall2. bachpsichord3.spmg54_1 (german speech)4. tomsdiner5. kraftwerk6.macabre7. bibilolo8.Stravinskii Capriccio9. fly_to_fly10. fatboy11. les voleurs12. eig13. enter sandman14. big yellow 15. davinci16. Castanets17. Linchpin18. waiting19. Bittersweet 20. Dimmu borgir orchestra21. bleed 22. Sangue de bairro23. Against24. stars25. worlds apart26. take your finger frin my head27. i want to break free28. atrain29. bonhemian rhapsody30. on the roof with Quasimodo
Stuff for the AAC 96 kbps listening test Reply #20 – 2011-07-10 00:33:32 If the samples from the last test were mentioned then it's actually fair to include these samples as well. Anyway it will be a random choice on a big amount of samples.It shouldn't be an issue IMO. Last Edit: 2011-07-10 00:41:27 by IgorC
Stuff for the AAC 96 kbps listening test Reply #21 – 2011-07-10 01:09:49 Quote from: IgorC on 2011-07-10 00:33:32Anyway it will be a random choice on a big amount of samples.Purely random? What if the majority of the samples end up being marimbas and guys yodeling in the shower?I suggest categories of samples, with random selection from each category.
Stuff for the AAC 96 kbps listening test Reply #22 – 2011-07-10 01:48:32 Quote from: hellokeith on 2011-07-10 01:09:49I suggest categories of samples, with random selection from each category.Well, it's up to /mnt and Steve Forte Rio. They will control the random selection of the samples. Maybe if they are kind to do some extra work it will be great. Last Edit: 2011-07-10 02:41:18 by IgorC
Stuff for the AAC 96 kbps listening test Reply #23 – 2011-07-10 10:31:47 Hm... What categories do you mean? By genres or maybe by the type of artefacts?I've just started to fill the table with sample names, URL's, genres (only for samples posted here) and comments (if exist). Anyway, I think it will take very long time to verify every sample (of more than 200 items) and determine the genre or artefacst type for each of them.What do you think, /mnt? Also, does anyone have some suggestions?
Stuff for the AAC 96 kbps listening test Reply #24 – 2011-07-10 11:21:24 Quote from: hellokeith on 2011-07-10 01:09:49What if the majority of the samples end up being marimbas and guys yodeling in the shower?There won't be such samples at all. The big list will contain a lot of samples with different kind of possible artifacts (temporal, frequency, stereo and other distortions) . Probability will work by itself. I'm pretty sure we will have the same results with/without classifying by artifacts.Quote from: hellokeith on 2011-07-10 01:09:49I suggest categories of samples, with random selection from each category.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. Everybody is welcome to online random selection of the samples. Here http://rolz.org/?p=group#This Wednesday at 12:00 (GMT - 3)