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Benjamin Zimmer
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Benjamin Zimmer

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Audio Examples: MP3 vs. AAC/M4A vs. Opus

In this previous thread we discussed the difference between the LAME and Fraunhofer CBR MP3 encoder at low bitrates:
https://plus.google.com/u/0/117038174657625698320/posts/ca1TxQUhaDj
So far there was no audio example where one could hear a relevant difference between both.

At the end of the discussion, some people were interested in the AAC codec, to get smaller podcast files with better quality.
Here I post some examples - encoded in AAC, in MP3 and in Opus - so that it is possible to compare the audio quality at various (low) bitrates.
I will add some personal comments to those files later, so that everyone can listen to them without reading my comments first.

You can listen to all files with a recent firefox, as it ships all necessary decoders.
(AFAIK Safari is still (the only?) browser which does not ship an opus decoder)


Example1: Mono file, speech only

This mono file contains female and male speakers.

Here is the uncompressed WAV file:
https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono.wav

64kbps (28MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-64k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-64k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-64k.opus

48kbps (21MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-48k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-48k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-48k.opus

32kbps (14MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-32k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-32k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-32k.opus

24kbps (11MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-24k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-24k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-24k.opus

16kbps (7MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-16k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-16k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-16k.opus

12kbps (5MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-12k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-12k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-12k.opus

6kbps (3MB/h):
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinMono-12k.opus


Example2: Stereo file, speech with music intro

This stereo file starts with a music intro, then contains female and male speakers.

Uncompressed WAV file:
https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo.wav

96kbps (42MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-96k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-96k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-96k.opus

64kbps (28MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-64k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-64k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-64k.opus

48kbps (21MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-48k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-48k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-48k.opus

32kbps (14MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-32k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-32k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-32k.opus

24kbps (11MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-24k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-24k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-24k.opus

16kbps (7MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-16k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-16k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-16k.opus

12kbps (5MB/h):
- mp3: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-12k.mp3
- aac: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-12k.m4a
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-12k.opus

6kbps (3MB/h):
- opus: https://auphonic.com/media/audio-examples/encoders/BitsOfBerlinStereo-12k.opus


It should be possible to reduce the file size and improve the quality when using AAC encoded files for a podcast.
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Benjamin Zimmer

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We're proud to introduce the new Podigee podcast statistics system. http://buff.ly/1Gy5cfW
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Star-Wars-Raumgleiter auf dem alten Flughafengelände in Berlin? Nicht ganz. Es klang nur so, als das achte Rennen der Formel-E-Weltmeisterschaft am vergangenen Wochenende dort ausgetragen wurde. (sha)
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In Tempelhof sirrten die Motoren: Am 23. Mai 2015 fand auf dem Gelände des Tempelhofer Flughafens der Berlin E-Prix statt, das achte Rennen der Formel-E-Weltmeisterschaft. Die Veranstaltung war gut
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DeviceDetector is a precise and fast user agent parser and device detector written in Ruby, backed by the largest and most up-to-date user agent database.

DeviceDetector detects thousands of user agent strings, even from rare and obscure browsers and devices.

DeviceDetector has been ported to Ruby and open-sourced by the Podigee team, as part of our give-back to the community.

For more details, check out the DeviceDetector website!
Device detector. DeviceDetector is a precise and fast user agent parser and device detector, backed by the largest and most up-to-date user agent database. View the Project on GitHub podigee/device_detector · Download ZIP File · Download TAR Ball · View On GitHub. DeviceDetector is a precise and ...
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Benjamin Zimmer

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Always loved the simple classic line of the MG roadster. Finally motivated myself to draw one. 

http://instagram.com/p/yhWT3zyFTQ/?modal=true

#car   #mg   #roadster   #drawing   #classiccar  
“Always loved the simple classic line of the MG roadster. Finally motivated myself to draw one. #car #mg #roadster #drawing #classiccar”
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Wer schon immer mal wissen wollte warum ein Computerfehler BUG heißt.
http://systemfehlr.de/sf01/
45 Minuten sehr, sehr guter #PodCast* der das ganze wirklich gut aufbereitet.

*Keiner von den LaberCasts sondern wirklich unterhaltsam. Wie eine Art Hörspiel.
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Systemfehler Folge 1 erzählt die Geschichte des (Computer) Bugs und klärt, was Insekten mit fehlerhaften Computerprogrammen zu tun haben. Grafikfehler in Computerspielen, Programmdefekte, die den Akku im Smartphone auf unerklärliche Weise leersaugen oder fehlerhafte Codeschnipsel, die die Sicherheit des gesamten Internets gefährden; so genannte Bugs, also Computerfehler sind mittlerweile überall, denn wir leben in einer Welt, die zunehmend vo...
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Danke für's Teilen :)
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Have him in circles
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Benjamin Zimmer

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Ach, da werden Erinnerungen wach: Mir hat SELFHTML damals beigebracht, was eigentlich <framesets> sind. ;) (dbe)
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Das Nachschlagewerk SELFHTML ist jetzt 20 Jahre alt. Das Projekt avancierte im deutschsprachigen Web zur beliebten Anlaufstelle für Webdesigner, die sich mit den Macken der Browser herumschlugen.
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Ach ja, lang ists her... Auch wenn ich das gelernte praktisch nicht mehr anwende, ist es bestimmt irgendwann noch mal nützlich.
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Now available in Germany.
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Sie können im Google Store Android-Telefone und -Tablets, Chromebooks, Android Wear, Chromecast, Nest sowie eine Auswahl an Zubehör kaufen.
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Fast 5 Monate zu spät, bzw 7 zu früh. 
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Gesundheit und gute Besserung! 

Die Grippewelle rollt im Moment wieder durch Deutschland - und das offenbar stärker als in den Jahren zuvor.

Basierend auf Suchanfragen und in Zusammenarbeit mit Gesundheitsbehörden findet ihr hier die aktuellen Google Grippe-Trends: http://goo.gl/HDBRpT

Hier könnt ihr euch außerdem eine Animation für Google Earth herunterladen, die die Grippe-Trends weltweit visualisiert: http://goo.gl/1F5WqK

#GoogleTrends  
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It just keeps getting better, and better, and better... Can't wipe the grin off my face! :)
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Today we’re launching a new extension for Chrome that lets you use the browser to open Google Drive files directly into an application installed on your computer. Read more at http://goo.gl/Ne22CE. 
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Have him in circles
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