Which Audio format to consider for iphone app

July 1, 2009 § 1 Comment

I am reporting my experiment here. I use a single simple audio file stereo 128 bitrate with 44,100 sample rate M4a file.

Original file size in M4A: 44KB

Conversion Results:

MP3 96KB (Switch)
WAV 1MB (Switch)
AIF 1MB (Switch)
CAF 1MB (Audacity)

I use another MP3 audio file to test the conversion.

Original file size in M4A: 16KB

Conversion Results:

AIF 96KB (Switch)
WAV 96MB (Switch)
CAF 96KB (Audacity)
AAC 14.5KB (iTune)
AAC 24KB (Gargage Band)

These conversion results indicate MP3 & M4A are by far the smallest in file sizes. Nothing is gained from converting from Mp3 or M4A to wave, aif, even caf, most preferred apple audio format Apple Core Audio.

It seems like M4A is the best audio format for file size. However, it is difficult to find open source free audio conversion to convert Mp3 to M4A. Switch, Audacity won’t support MP3/M4A conversion. Using iTune is not convenience to locate the final audio file location.

If you have a very small audio file in Mp3, you gain very little from converting to M4A. In this case, my Mp3 file is 16KB and converted AAC (Equivalent to M4A) is 14.5KB.

I never find any articles on audio file comparison. I have been using the assumed popular audio format. I learn my lessons here.

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