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i want to convert in my App M4a file to Mp3 file, i try to use the TSlibraryimport but it not doing this proccess .
it can be done also by moving the m4a file to nsdata
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In Windows Media Player, you can select an M4A track in your library, and then go into 'Options', 'Rip Music', select 'Change' and then choose 'MP3' as the format.
The best way to convert M4A audio files to MP3 without any quality loss is using VideoSolo Video Converter Ultimate. This professional media converter supports a number of input and output audio formats, including M4A, MP3, AAC, FLAC, MP3, APE, AC3, WAV, etc.
How Do I convert M4A to MP3 using Windows media player? Open your M4A file with Windows Media Player. Click on the Organize button at the top left, select Options. Select the Rip Music tab and click the Change button to specify the location you want to rip music to and choose MP3 as the format.
You can try to use CoreAudio
and LAME codec (this isn't included in iOS for license reasons)
some example of converting audio types via CoreAudio:
http://developer.apple.com/library/mac/#samplecode/ConvertFile/Introduction/Intro.html
and CoreAudio docs:
http://developer.apple.com/library/mac/#documentation/MusicAudio/Conceptual/CoreAudioOverview/Introduction/Introduction.html
and supported filetypes for CoreAudio: http://developer.apple.com/library/mac/#documentation/MusicAudio/Conceptual/CoreAudioOverview/SupportedAudioConverterFormats/SupportedAudioConverterFormats.html#//apple_ref/doc/uid/TP40003577-CH7-SW1
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