音風景ブログ RSSフィード

2012-11-16

Opus, AAC 75kbps,100kbpsの音質比較

概要

新しいOpus audio codecとAAC-LCの音質比較。

2012年9月時点で最新のtfsel5(libopus 0.9.11-146-gdc4f83b-exp_analysis)と古いバージョン(CELT)の0.11.2、AAC定評のあるAppleエンコーダーをqaac経由で、CVBRとTVBRを比較。

結果

AAC 100kbps(tvbr,cvbr) ≒ Celt 100kbps ≒ Opus 100kbps > Opus 75kbps ≒ Celt 75kbps > AAC 75kbps(tvbr,cvbr)

評価

f:id:kamedo2:20121117055135p:image

f:id:kamedo2:20121117045311p:image

エンコーダOpusCeltqaacqaacOpusCeltqaacqaac
リリース年20122011201220122012201120122012
バージョン0.9.110.11.21.401.400.9.110.11.21.401.40
フォーマットOpusOpusAACAACOpusOpusAACAAC
ビットレート66k75k72k2790k100k96k45
41_30sec打楽器3.13.12.52.83.53.83.73.8
finalfantasy撥弦楽3.83.02.72.84.13.84.03.9
ATrainジャズ2.82.63.03.03.63.34.13.9
BigYellowPOPS2.73.22.32.33.33.83.63.7
FloorEssenceテクノ4.03.42.92.94.43.93.63.6
macabreオケ2.62.62.82.83.33.24.03.9
mybloodrusts弦楽器3.44.03.03.23.84.53.73.8
Quizasラテン3.53.52.92.83.84.14.14.2
VelvetRealmテクノ3.02.73.63.53.33.54.03.8
雨降花POPS3.13.42.82.63.83.84.24.0
TrustGosp3.33.12.62.63.83.43.53.5
Waitingロック3.83.42.83.04.13.83.83.9
Experienciaラテン3.63.32.62.74.34.03.83.6
HeartToHeartPOPS3.13.42.82.63.73.73.93.8
Tom's Diner女声3.43.52.92.93.74.03.83.9
ReunionBluesジャズ3.33.32.82.83.73.93.93.8
French男女声3.63.83.33.33.64.03.73.7
undeletePOPS3.73.33.33.33.93.74.14.0
Dimmu Borgirメタル3.13.63.23.03.73.84.13.9
Run upPOPS3.74.13.02.94.14.33.83.6
↑音源平均点3.313.302.882.873.763.793.853.81
実レート75k75k77k73k100k100k102k99k
全サイズ(KB)43884403449942415893587859945782
エンコーダOpusCeltqaacqaacOpusCeltqaacqaac

テストに利用した音源を試聴したい方、ダウンロードしたい方、ログを見たい方はこちらへ。

http://zak.s206.xrea.com/bitratetest/main.htm

方法

銘柄に対する先入観が影響しないように、PSP abc/hr v2.3とRP-HT560を利用して、6個の音声ファイルをランダムに並び替えて、銘柄を伏せた状態で聴いて採点した。1.0=音質劣化が非常に気になる 2.0=気になる 3.0=わずかに気になる 4.0=原音からの音質変化が分かるが、気にならない 5.0=音質変化がわからない、区別できない。4.9点以下の評点をつける場合は、ABXYテストを15回行い、12回以上(これ以上の成績をまぐれで出す確率は約2%)正解して、違いを聞き取れることを確認してからそうした。同じテストを、RP-HJE150でもう一度行い、2評点の平均をとった。

このテストでの採点は、20(音源)×8(エンコーダ)×2(回)=320(回)。

使用したオプション

opusenc --bitrate 66 input.wav output.wav
celtenc input.48k.raw --bitrate 75 --comp 10 output.wav
qaac --cvbr 72 -o output.m4a input.wav
qaac --tvbr 27 -o output.m4a input.wav
opusenc --bitrate 90 input.wav output.wav
celtenc input.48k.raw --bitrate 100 --comp 10 output.wav
qaac --cvbr 96 -o output.m4a input.wav
qaac --tvbr 45 -o output.m4a input.wav

使用したオプション(フル)

echo ===================Opus Section Start(75k)===================
bin\opus-tools_exp_tfsel5\opusenc --bitrate 66 "%InputWavFile%" "%OutputFile%%Opus75Name%"
bin\opus-tools_exp_tfsel5\opusdec "%OutputFile%%Opus75Name%" "%TemporaryFile%.o75.wav"
bin\sox "%TemporaryFile%.o75.wav" -b 32 -e float "%Opus75Decode%" gain -1 rate -v 44100

echo ===================Celt Section Start(75k)===================
bin\sox %InputWavFile% "%TemporaryFile%.48k.wav" gain -1 rate 48000 dither -s
bin\celt-0.11.2-win32\celtenc "%TemporaryFile%.48k.wav" --bitrate 75 --comp 10 "%OutputFile%%Celt75Name%"
bin\celt-0.11.2-win32\celtdec "%OutputFile%%Celt75Name%" "%TemporaryFile%.c75.wav"
bin\sox "%TemporaryFile%.c75.wav" -b 32 -e float "%Celt75Decode%" rate -v 44100

echo ===================Aac Section Start(75k)===================
bin\qaac_1.40\qaac --cvbr 72 -o "%OutputFile%%Aaccv75Name%" "%InputWavFile%"
bin\faad -b 4 -o "%Aaccv75Decode%" "%OutputFile%%Aaccv75Name%"
bin\qaac_1.40\qaac --tvbr 27 -o "%OutputFile%%Aactv75Name%" "%InputWavFile%"
bin\faad -b 4 -o "%Aactv75Decode%" "%OutputFile%%Aactv75Name%"

echo ===================Opus Section Start(100k)===================
bin\opus-tools_exp_tfsel5\opusenc --bitrate 90 "%InputWavFile%" "%OutputFile%%Opus100Name%"
bin\opus-tools_exp_tfsel5\opusdec "%OutputFile%%Opus100Name%" "%TemporaryFile%.o100.wav"
bin\sox "%TemporaryFile%.o100.wav" -b 32 -e float "%Opus100Decode%" gain -1 rate -v 44100

echo ===================Celt Section Start(100k)===================
bin\sox %InputWavFile% "%TemporaryFile%.48k.wav" gain -1 rate 48000 dither -s
bin\celt-0.11.2-win32\celtenc "%TemporaryFile%.48k.wav" --bitrate 100 --comp 10 "%OutputFile%%Celt100Name%"
bin\celt-0.11.2-win32\celtdec "%OutputFile%%Celt100Name%" "%TemporaryFile%.c100.wav"
bin\sox "%TemporaryFile%.c100.wav" -b 32 -e float "%Celt100Decode%" rate -v 44100

echo ===================Aac Section Start(100k)===================
bin\qaac_1.40\qaac --cvbr 96 -o "%OutputFile%%Aaccv100Name%" "%InputWavFile%"
bin\faad -b 4 -o "%Aaccv100Decode%" "%OutputFile%%Aaccv100Name%"
bin\qaac_1.40\qaac --tvbr 45 -o "%OutputFile%%Aactv100Name%" "%InputWavFile%"
bin\faad -b 4 -o "%Aactv100Decode%" "%OutputFile%%Aactv100Name%"

詳細な優劣の分析

FRIEDMAN version 1.24 (Jan 17, 2002) http://ff123.net/
Blocked ANOVA analysis

Number of listeners: 20
Critical significance:  0.05
Significance of data: 0.00E+000 (highly significant)
---------------------------------------------------------------
ANOVA Table for Randomized Block Designs Using Ratings

Source of         Degrees     Sum of    Mean
variation         of Freedom  squares   Square    F      p

Total              159          37.82
Testers (blocks)    19           4.43
Codecs eval'd        7          23.92    3.42   48.00  0.00E+000
Error              133           9.47    0.07
---------------------------------------------------------------
Fisher's protected LSD for ANOVA:   0.167

Means:

cvbr100k tvbr100k celt100k opus100k opus_75k celt_75k cvbr_75k tvbr_75k
  3.85     3.80     3.79     3.76     3.31     3.29     2.88     2.87

---------------------------- p-value Matrix ---------------------------

         tvbr100k celt100k opus100k opus_75k celt_75k cvbr_75k tvbr_75k
cvbr100k 0.636    0.516    0.302    0.000*   0.000*   0.000*   0.000*
tvbr100k          0.859    0.574    0.000*   0.000*   0.000*   0.000*
celt100k                   0.701    0.000*   0.000*   0.000*   0.000*
opus100k                            0.000*   0.000*   0.000*   0.000*
opus_75k                                     0.836    0.000*   0.000*
celt_75k                                              0.000*   0.000*
cvbr_75k                                                       0.953
-----------------------------------------------------------------------

cvbr100k is better than opus_75k, celt_75k, cvbr_75k, tvbr_75k
tvbr100k is better than opus_75k, celt_75k, cvbr_75k, tvbr_75k
celt100k is better than opus_75k, celt_75k, cvbr_75k, tvbr_75k
opus100k is better than opus_75k, celt_75k, cvbr_75k, tvbr_75k
opus_75k is better than cvbr_75k, tvbr_75k
celt_75k is better than cvbr_75k, tvbr_75k

整形済みデータ

% Opus, AAC 75kbps, 100kbps ABC/HR Score
opus_75k	celt_75k	cvbr_75k	tvbr_75k	opus100k	celt100k	cvbr100k	tvbr100k
%features 6 75kbps 75kbps 75kbps 75kbps 100kbps 100kbps 100kbps 100kbps
%features 7 OPUS OPUS AAC-LC AAC-LC OPUS OPUS AAC-LC AAC-LC 
3.050	3.100	2.500	2.750	3.500	3.750	3.700	3.800	
3.750	2.950	2.700	2.750	4.050	3.800	4.000	3.950	
2.800	2.550	3.000	3.000	3.600	3.250	4.050	3.900	
2.700	3.150	2.350	2.300	3.350	3.800	3.600	3.700	
4.000	3.400	2.850	2.850	4.350	3.900	3.550	3.550	
2.600	2.550	2.800	2.800	3.350	3.150	3.950	3.900	
3.400	3.950	3.000	3.200	3.850	4.500	3.700	3.800	
3.450	3.500	2.900	2.800	3.850	4.050	4.050	4.150	
2.950	2.700	3.550	3.450	3.250	3.450	4.000	3.850	
3.100	3.400	2.750	2.600	3.800	3.850	4.150	4.000	
3.350	3.100	2.600	2.600	3.750	3.400	3.450	3.500	
3.750	3.350	2.800	2.950	4.050	3.750	3.800	3.850	
3.550	3.300	2.600	2.650	4.250	3.950	3.750	3.600	
3.100	3.350	2.750	2.550	3.650	3.700	3.850	3.800	
3.400	3.450	2.900	2.900	3.650	3.950	3.750	3.900	
3.250	3.300	2.750	2.800	3.650	3.850	3.950	3.750	
3.600	3.800	3.300	3.300	3.550	4.000	3.650	3.700	
3.700	3.350	3.300	3.300	3.900	3.650	4.100	4.000	
3.100	3.600	3.150	3.000	3.700	3.800	4.100	3.850	
3.650	4.050	3.000	2.900	4.050	4.250	3.750	3.550	

エンコードデコードのログ

===================Processing Wav File "D:\autoencode2\10xh_.wav"===================
===================Opus Section Start(75k)===================
Encoding using libopus 0.9.11-146-gdc4f83b-exp_analysis (audio)
-----------------------------------------------------
   Input: 44.1kHz 2 channels
  Output: 2 channels (2 coupled)
          20ms packets, 66kbit/sec VBR
 Preskip: 356

[|] 00:00:00.02 2e+004x realtime, 69.02kbit/s1 1
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[|] 00:00:21.23 21.2x realtime, 68.74kbit/s0 0
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0 0
1 1
Encoding complete                           
-----------------------------------------------------
    Encoded: 30.02 seconds
    Runtime: 1 seconds
             (30.02x realtime)
      Wrote: 286309 bytes, 1501 packets, 33 pages
    Bitrate: 75.5603kbit/s (without overhead)
 Rate range: 45.2kbit/s to 132kbit/s
             (113 to 330 bytes per packet)
   Overhead: 0.967% (container+metadata)

Decoding to 44100 Hz (2 channels)
Encoded with libopus 0.9.11-146-gdc4f83b-exp_analysis
ENCODER=opusenc from opus-tools 0.1.4-5-gc9d0ef5
Decoding complete.        
===================Celt Section Start(75k)===================
bin\sox WARN rate: rate clipped 6 samples; decrease volume?
bin\sox WARN dither: dither clipped 3 samples; decrease volume?
Encoding 48 kHz stereo audio in 20ms packets at 75.000kbit/sec (1275 bytes per packet maximum) with bitstream version -2147483632
Average rate 74.397kbit/sec, 321 peak bytes per packet
Decoding 48000 Hz audio in (stereo)
Encoded with CELT 0.11.2 (bitstream: -2147483632)

bin\sox WARN rate: rate clipped 3 samples; decrease volume?
bin\sox WARN sox: `sound_raw\10xh_.celt0112_75k.oga.f32b.wav' output clipped 2 samples; decrease volume?
===================Aac Section Start(75k)===================
qaac 1.40, CoreAudioToolbox 7.9.7.9

10xh_.wav
AAC-LC Encoder, CVBR 72kbps, Quality 96
[100.0%] 0:30.000/0:30.000 (43.7x), ETA 0:00.000  
1323001/1323001 samples processed in 0:00.687
Overall bitrate: 79.0504kbps
 *********** Ahead Software MPEG-4 AAC Decoder V2.7 ******************

 Build: Jun 14 2010
 Copyright 2002-2004: Ahead Software AG
 http://www.audiocoding.com
 Floating point version

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License.

 **************************************************************************

sound_out\10xh_.qa40_cv72.m4a file info:

LC AAC	30.040 secs, 2 ch, 44100 Hz

tool: qaac 1.40, CoreAudioToolbox 7.9.7.9, AAC-LC Encoder, CVBR 72kbps, Quality 96
iTunSMPB:  00000000 00000840 000003C7 0000000000142FF9 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

  ---------------------
 | Config:  2 Ch       |
  ---------------------
 | Ch |    Position    |
  ---------------------
 | 00 | Left front     |
 | 01 | Right front    |
  ---------------------

Decoding sound_out\10xh_.qa40_cv72.m4a took:  0.31 sec. 96.28x real-time.
qaac 1.40, CoreAudioToolbox 7.9.7.9

10xh_.wav
AAC-LC Encoder, TVBR q27, Quality 96
[100.0%] 0:30.000/0:30.000 (44.7x), ETA 0:00.000  
1323001/1323001 samples processed in 0:00.671
Overall bitrate: 83.2438kbps
 *********** Ahead Software MPEG-4 AAC Decoder V2.7 ******************

 Build: Jun 14 2010
 Copyright 2002-2004: Ahead Software AG
 http://www.audiocoding.com
 Floating point version

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License.

 **************************************************************************

sound_out\10xh_.qa40_tv27.m4a file info:

LC AAC	30.040 secs, 2 ch, 44100 Hz

tool: qaac 1.40, CoreAudioToolbox 7.9.7.9, AAC-LC Encoder, TVBR q27, Quality 96
iTunSMPB:  00000000 00000840 000003C7 0000000000142FF9 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

  ---------------------
 | Config:  2 Ch       |
  ---------------------
 | Ch |    Position    |
  ---------------------
 | 00 | Left front     |
 | 01 | Right front    |
  ---------------------

Decoding sound_out\10xh_.qa40_tv27.m4a took:  0.30 sec. 101.15x real-time.
===================Opus Section Start(100k)===================
Encoding using libopus 0.9.11-146-gdc4f83b-exp_analysis (audio)
-----------------------------------------------------
   Input: 44.1kHz 2 channels
  Output: 2 channels (2 coupled)
          20ms packets, 90kbit/sec VBR
 Preskip: 356

[/] 00:00:04.08 4.08x realtime, 90.57kbit/s1 1
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Encoding complete                           
-----------------------------------------------------
    Encoded: 30.02 seconds
    Runtime: 1 seconds
             (30.02x realtime)
      Wrote: 388799 bytes, 1501 packets, 33 pages
    Bitrate: 102.809kbit/s (without overhead)
 Rate range: 64kbit/s to 180kbit/s
             (160 to 450 bytes per packet)
   Overhead: 0.774% (container+metadata)

Decoding to 44100 Hz (2 channels)
Encoded with libopus 0.9.11-146-gdc4f83b-exp_analysis
ENCODER=opusenc from opus-tools 0.1.4-5-gc9d0ef5
Decoding complete.        
===================Celt Section Start(100k)===================
bin\sox WARN rate: rate clipped 6 samples; decrease volume?
bin\sox WARN dither: dither clipped 3 samples; decrease volume?
Encoding 48 kHz stereo audio in 20ms packets at 100.000kbit/sec (1275 bytes per packet maximum) with bitstream version -2147483632
Average rate 99.708kbit/sec, 430 peak bytes per packet
Decoding 48000 Hz audio in (stereo)
Encoded with CELT 0.11.2 (bitstream: -2147483632)

===================Aac Section Start(100k)===================
qaac 1.40, CoreAudioToolbox 7.9.7.9

10xh_.wav
AAC-LC Encoder, CVBR 96kbps, Quality 96
[100.0%] 0:30.000/0:30.000 (42.7x), ETA 0:00.000  
1323001/1323001 samples processed in 0:00.702
Overall bitrate: 108.723kbps
 *********** Ahead Software MPEG-4 AAC Decoder V2.7 ******************

 Build: Jun 14 2010
 Copyright 2002-2004: Ahead Software AG
 http://www.audiocoding.com
 Floating point version

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License.

 **************************************************************************

sound_out\10xh_.qa40_cv96.m4a file info:

LC AAC	30.040 secs, 2 ch, 44100 Hz

tool: qaac 1.40, CoreAudioToolbox 7.9.7.9, AAC-LC Encoder, CVBR 96kbps, Quality 96
iTunSMPB:  00000000 00000840 000003C7 0000000000142FF9 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

  ---------------------
 | Config:  2 Ch       |
  ---------------------
 | Ch |    Position    |
  ---------------------
 | 00 | Left front     |
 | 01 | Right front    |
  ---------------------

Decoding sound_out\10xh_.qa40_cv96.m4a took:  0.30 sec. 101.49x real-time.
qaac 1.40, CoreAudioToolbox 7.9.7.9

10xh_.wav
AAC-LC Encoder, TVBR q45, Quality 96
[100.0%] 0:30.000/0:30.000 (40.9x), ETA 0:00.000  
1323001/1323001 samples processed in 0:00.734
Overall bitrate: 111.509kbps
 *********** Ahead Software MPEG-4 AAC Decoder V2.7 ******************

 Build: Jun 14 2010
 Copyright 2002-2004: Ahead Software AG
 http://www.audiocoding.com
 Floating point version

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License.

 **************************************************************************

sound_out\10xh_.qa40_tv45.m4a file info:

LC AAC	30.040 secs, 2 ch, 44100 Hz

tool: qaac 1.40, CoreAudioToolbox 7.9.7.9, AAC-LC Encoder, TVBR q45, Quality 96
iTunSMPB:  00000000 00000840 000003C7 0000000000142FF9 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

  ---------------------
 | Config:  2 Ch       |
  ---------------------
 | Ch |    Position    |
  ---------------------
 | 00 | Left front     |
 | 01 | Right front    |
  ---------------------

Decoding sound_out\10xh_.qa40_tv45.m4a took:  0.30 sec. 101.15x real-time.
===================Rawgene2 Section Start===================
rawgene v.2.0.0  /  original reference file:sound_raw\10xh_.original.f32b.wav
                     Offset[sample]  Gain    Gain[dB]     Score
FLO 1>10xh_.opust014> O:    0   G: 1.109189  G: 0.900114  S: 0.416530
FLO 2>10xh_.celt0112> O:    0   G: 1.121005  G: 0.992154  S: 0.349920
FLO 3>10xh_.qa40_cv7> O: 1088   G: 1.005395  G: 0.046732  S: 0.279179
FLO 4>10xh_.qa40_tv2> O: 1088   G: 1.005395  G: 0.046732  S: 0.279179
FLO 5>10xh_.opust014> O:    0   G: 1.121764  G: 0.998028  S: 0.352620
FLO 6>10xh_.celt0112> O:    0   G: 1.125816  G: 1.029351  S: 0.276586
FLO 7>10xh_.qa40_cv9> O: 1088   G: 1.012118  G: 0.104624  S: 0.215851
FLO 8>10xh_.qa40_tv4> O: 1088   G: 1.012118  G: 0.104624  S: 0.215851
biggest_delay    : 1088
smallest_delay   : 0
biggest_gain     : 1.125816
shortest_sample  : 1321913
initial_offset   : 7126

注:公開試聴試験での多人数の平均評点と管理人の評点が似たような傾向になることは確認しているので言えるが、ある個人がある再生環境で、ある価値観のもとに聞いたときの評価が、ここに書いた管理人の評価に似るかどうかまでは何とも言えない。また、今回利用した音源とは傾向の異なる音を多くエンコードした場合、結果や順位が異なる可能性があります。

LunasnowLunasnow 2012/12/24 22:29 Can you compare Lame 3.99 "-Y" setting in same bit

such as "V2 and V1 -Y" or "V2.9 and V2 -Y"

kamedo2kamedo2 2012/12/24 22:47 If you are looking for a quality improvement, I'd recommend:
http://www.hydrogenaudio.org/forums/index.php?showtopic=98383
I'm going to start ABC/HR of 224k MP3s 2013/01 but I won't include -Y because I don't think there are big differences.

スパム対策のためのダミーです。もし見えても何も入力しないでください
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