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8th November 2009, 21:46 | #1024 | Link |
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The test was biased because inherently the "source" DTS has already been processed/filtered in favor of DTS.
Also, since we know that the LPCM track of At World's End is 16 bit, there is a very high probability that the source for the DTS was also 16 bit, regardless of the DTS header information. |
8th November 2009, 21:53 | #1025 | Link | ||
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Code:
Name | SNR | PEAQ || SNR | PEAQ 448 kbps 224 kbps DD6, L | 22.618| -0.205 || 16.188| -2.471 aften, L | 18.541| -0.523 || 12.844| -3.115 DD6, C | 23.644| -0.175 || 16.875| -2.203 aften, C | 18.571| -0.377 || 12.790| -3.109 Quote:
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8th November 2009, 22:16 | #1026 | Link | |
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you and yesgrey3 could post yours samples for members apreciations if don't break forum's rules. regards! |
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8th November 2009, 23:39 | #1027 | Link | ||
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I would also like to see the numbers with 640kbps... Quote:
I've extracted the period between minute 1:00 to 2:10 of "quantum of solace" Blu-ray. |
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9th November 2009, 02:53 | #1028 | Link | |
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Dolby 5.1 AC3 448 Kbps, Freq 14/20, Aften 17 Khz Dolby 2.0 AC3 192 Kbps, Freq 10/20, Aften 15 Khz Probably because the lack of channel/frequency coupling in Aften, if I recall correctly you need 572/256 Kbps for true 20 Khz cut off on 5.1/2.0 audio files encoded by dolby encoders, ironical you can't get more than that in an official encoder, but with aften you can go up to 24 Khz if you want to. |
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10th November 2009, 12:16 | #1029 | Link |
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i posted few samples in lots of formats with round 10 seconds in the forum some time ago in differents threads and i don't break rules as the idea is too share and change informations then, i can't see any problem.
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10th November 2009, 14:31 | #1030 | Link | ||
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Code:
Name | SNR | PEAQ 448 kbps DD6, L | 23.382| -0.205 aften, L | 19.154| -0.582 Code:
Name | SNR | PEAQ 640 kbps DD6, L | 27.809| -0.039 aften, L | 22.764| -0.172 DD6, C | 28.911| 0.003 aften, C | 22.982| -0.056 Quote:
But you should note, that all these numbers are mostly about development. If you feel that aften "sounds better" then you should use it. |
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10th November 2009, 18:44 | #1031 | Link | |
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10th November 2009, 21:07 | #1032 | Link | |
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Yes, I forgot to look at those...
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It would be interesting to compare the results with the AC3 640kbps, since some tests showed that AC3 640kbps is superior to DTS 1510kbps... |
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11th November 2009, 20:22 | #1033 | Link |
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Abradoks
first i thank you to send the samples and source. to encode with aften i use WAVtoAC3Enc4.1, all adjusts default(aften R832, newers versions don't work in my old win2000). 224k: sounds equal, frequences don't go ahead 9KHz. 448: WOW, your sample sounds good, is clever and go ahead 20KHz. with aften sounds good too but don't go ahead 17KHz. see?!? hearing we can feel differences! ...now i have requests to use it in WAVtoAC3Enc cheers and thanks again. Last edited by raquete; 11th November 2009 at 20:27. |
11th November 2009, 21:16 | #1034 | Link |
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Please try to compare aften encodings with different frequency cutoffs. Here are six samples: aften_wide ("-w 60" for 448 kbit/s and 224 kbit/s; full range), aften_spec ("-w 48" and "-w 8"; DD range) and aften ("-w 34" and "-w 6"; default range).
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12th November 2009, 15:58 | #1035 | Link |
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Abradoks, i'm horrible in command lines and i use WAVtoAC3Enc4.1(Aften) and don't know how to do the rights adjusts in this prog too.
can you write the command lines to use Aften with yours parameters posted please? thanks. |
12th November 2009, 17:34 | #1036 | Link | |
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12th November 2009, 19:26 | #1037 | Link | |
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Last edited by Abradoks; 12th November 2009 at 23:52. |
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13th November 2009, 13:49 | #1038 | Link | |
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output.224.aften don't go ahead 9KHz. output.224.aften_spec don't go ahead 9,5KHz. output.224.aften_wide go ahead 23KHz. output.448.aften don't go ahead 17KHz. output.448.aften_spec go ahead 20,5KHz. output.448.aften_wide go ahead 23KHz. "wide" samples are very very good, 224.aften_wide and 448.aften_spec is very nice too! i could feel better differences if was know musics but the samples are clevers. thanks and regards! |
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15th November 2009, 19:36 | #1039 | Link | |
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The problem I've had implementing it in Aften has been the complexity of the code due to simd and multi-threading. As an experiment, I stripped all of that out and was able to get working channel coupling (although it was much slower obviously). I'm still working on trying to get it ported over to Aften. Based on the AC-3 features used, the only other place where there could be some differences is in the exponent strategy decision. I have not analyzed this very thoroughly yet. I think Aften's exponent strategy implementation is pretty good though. edit: oh, and not that it will matter a lot, but for any further comparisons you should turn on block switching in Aften since DD does block switching by default. Last edited by jruggle; 15th November 2009 at 19:38. |
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