Changes between Version 55 and Version 56 of Encode/HighQualityAudio


Ignore:
Timestamp:
Aug 10, 2017, 3:15:38 PM (2 months ago)
Author:
slhck
Comment:

add resources and update usable range of Opus based on literature

Legend:

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  • Encode/HighQualityAudio

    v55 v56  
    9797 
    9898The bitrates listed here assume 2-channel stereo and a sample rate of 44.1kHz or 48kHz. Mono, speech, and quiet audio may require fewer bits.[[BR]] 
    99 - '''libopus''' Usable range >= 80Kbps. Recommended range '''>= 128Kbps'''[[BR]] 
    100 - '''libfdk_aac default AAC LC profile.''' Recommended range '''>= 128Kbps'''; see [[Encode/AAC|AAC Encoding Guide]]. [[BR]] 
    101 - '''libfdk_aac -profile:a aac_he_v2''' Usable range '''<= 48Kbps CBR'''. Transparency: Does not reach transparency. Use AAC LC instead to achieve transparency[[BR]] 
    102 - '''libfdk_aac -profile:a aac_he''' Usable range '''>= 48Kbps and <= 80Kbps CBR'''. Transparency: Does not reach transparency. Use AAC LC instead to achieve transparency[[BR]] 
    103 - '''libvorbis''' Usable range >= 96Kbps. Recommended range '''-aq 4 (>= 128Kbps)'''[[BR]] 
    104 - '''libmp3lame''' Usable range >= 128Kbps. Recommended range '''-aq 2 (>= 192Kbps)'''[[BR]] 
    105 - '''ac3 or eac3''' Usable range >= 160Kbps. Recommended range '''>= 160Kbps'''[[BR]] 
     99- '''libopus''' – usable range ≥ 32Kbps. Recommended range ≥ 64Kbps[[BR]] 
     100- '''libfdk_aac default AAC LC profile''' – recommended range ≥ 128Kbps; see [[Encode/AAC|AAC Encoding Guide]]. [[BR]] 
     101- '''libfdk_aac -profile:a aac_he_v2''' – usable range ≤ 48Kbps CBR. Transparency: Does not reach transparency. Use AAC LC instead to achieve transparency[[BR]] 
     102- '''libfdk_aac -profile:a aac_he''' – usable range ≥ 48Kbps and ≤ 80Kbps CBR. Transparency: Does not reach transparency. Use AAC LC instead to achieve transparency[[BR]] 
     103- '''libvorbis''' – usable range ≥ 96Kbps. Recommended range `-aq 4` (≥ 128Kbps)[[BR]] 
     104- '''libmp3lame''' – usable range ≥ 128Kbps. Recommended range `-aq 2` (≥ 192Kbps)[[BR]] 
     105- '''ac3 or eac3''' – usable range ≥ 160Kbps. Recommended range ≥ 160Kbps[[BR]] 
    106106 
    107107 Example of usage: 
     
    109109ffmpeg -i input.wav -c:a libfaac -q:a 330 -cutoff 15000 output.m4a 
    110110}}} 
    111 - '''aac''' Usable range >= 32Kbps (depending on profile and audio). Recommended range '''>= 128Kbps'''[[BR]] 
     111- '''aac''' – usable range ≥ 32Kbps (depending on profile and audio). Recommended range ≥ 128Kbps[[BR]] 
    112112 Example of usage: 
    113113{{{ 
    114114ffmpeg -i input.wav output.m4a 
    115115}}} 
    116 - '''libtwolame''' Usable range >= 192Kbps. Recommended range '''>= 256Kbps'''[[BR]] 
    117 - '''mp2''' Usable range >= 320Kbps. Recommended range '''>= 320Kbps'''[[BR]] 
     116- '''libtwolame''' – usable range ≥ 192Kbps. Recommended range ≥ 256Kbps[[BR]] 
     117- '''mp2''' – usable range ≥ 320Kbps. Recommended range ≥ 320Kbps[[BR]] 
    118118 
    119119The '''vorbis''' and '''wmav1/wmav2''' encoders are not worth using.[[BR]] 
     
    131131[[BR]] 
    132132 
     133== Resources == 
     134 
     135* [http://opus-codec.org/comparison/ Opus – Codec Landscape] 
     136* [https://people.xiph.org/~greg/opus/ha2011/ xiph.org – 64kbit/sec stereo multiformat listening test] including Opus, aoTuV Vorbis, two HE-AAC encoders, and a 48kbit/sec AAC-LC low anchor 
     137* [http://listening-test.coresv.net/results.htm#list9 Results of the public multiformat listening test (July 2014)] – Opus, AAC and Ogg Vorbis at 96 kbps against a classic MP3 128 kbps 
     138* [http://opus-codec.org/static/comparison/GoogleTest1.pdf Google Listening Test #1] – comparing Opus, Speex, and others 
     139* [http://opus-codec.org/static/comparison/GoogleTest2.pdf Google Listening Test #2] – comparing Opus, Speex, and others 
     140