Found this article about Apple Digitial masters. I have highlighted some interesting requirements. Although this describes the process, since there are multiple encodes at different bitrates you may not hear the 24 44.1K track since it is unclear which encoding Apple Music decides to play. Here are the various encodings (256, 64, 128, 44100-24) for the Beatles Yellow Submarine album which is tagged as a digital master. Edited to maker easier to read.
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=261421,_AVG-BANDWIDTH=261421,BANDWIDTH=265876,CODECS="mp4a.40.2",,AUDIO="audio-stereo-256"_audio_en_gr256.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=74912,_AVG-BANDWIDTH=74912,BANDWIDTH=79969,CODECS="mp4a.40.5",AUDIO="audio-HE-stereo-64"_audio_en_gr64.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=134373,_AVG-BANDWIDTH=134373,BANDWIDTH=136445,CODECS="mp4a.40.2",AUDIO="audio-stereo-128"_audio_en_gr128.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=1569829,_AVG-BANDWIDTH=1569829,BANDWIDTH=1634037,CODECS="alac",AUDIO="audio-alac-stereo-44100-24"_audio_en_gr2116.m3u8
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The SoundLAB is certified by Apple to provide this service. Only masters from certified mastering facilities can be submitted to Apple as a Digital Master.
In order to be Apple certified the client must provide a high resolution master to us for the mastering session. The master must be at least 24-bits, with a sample rate of at least 44.1K, though higher is recommended if possible. If a 16-bit master such as an audio CD, upload through our MUA, or 16-bit WAV files is submitted, we cannot complete the Apple Digital Mastering process.
The second part of the mastering process happens during the mastering session. Using tools provided by Apple, the mastering engineer will preview the mastered files through the same encoding process that Apple will use to create the AAC files that will be sold through iTunes. Based on that preview the engineer may make some adjustments to the mastered files in order to optimize the sound after the encoding process is completed. Another tool alerts the engineer to any clipping of the audio signal that is occuring during the AAC conversion. Based on this info the engineer can reduce the overall volume to avoid this clipping.
The result of this process is a file submitted to Apple that will yield the highest quality conversion to an AAC file for sale on iTunes.
Since the Apple Digital Mastering process does add time to a mastering session there will be an additional charge of $10 per track when a client is requesting this service. In order to request this service, please call us at 1-888-296-2747 to get a custom mastering quote.
To submit Apple Digital Master files to iTunes you will need to do a second submission through CD Baby.
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=261421,_AVG-BANDWIDTH=261421,BANDWIDTH=265876,CODECS="mp4a.40.2",,AUDIO="audio-stereo-256"_audio_en_gr256.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=74912,_AVG-BANDWIDTH=74912,BANDWIDTH=79969,CODECS="mp4a.40.5",AUDIO="audio-HE-stereo-64"_audio_en_gr64.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=134373,_AVG-BANDWIDTH=134373,BANDWIDTH=136445,CODECS="mp4a.40.2",AUDIO="audio-stereo-128"_audio_en_gr128.m3u8
#EXT-X-STREAM-INF:AVERAGE-BANDWIDTH=1569829,_AVG-BANDWIDTH=1569829,BANDWIDTH=1634037,CODECS="alac",AUDIO="audio-alac-stereo-44100-24"_audio_en_gr2116.m3u8
What is Apple Digital Masters or Mastering for iTunes (MFiT) and do you offer it?
Apple Digital Masters or Mastered for iTunes(sometimes shortened to MFiT) is a process developed by Apple that mastering engineers follow in order to submit the highest quality master to Apple for ...
What is Apple Digital Masters or Mastering for iTunes (MFiT) and do you offer it?
Apple Digital Masters or Mastered for iTunes(sometimes shortened to MFiT) is a process developed by Apple that mastering engineers follow in order to submit the highest quality master to Apple for sale through iTunes.The SoundLAB is certified by Apple to provide this service. Only masters from certified mastering facilities can be submitted to Apple as a Digital Master.
In order to be Apple certified the client must provide a high resolution master to us for the mastering session. The master must be at least 24-bits, with a sample rate of at least 44.1K, though higher is recommended if possible. If a 16-bit master such as an audio CD, upload through our MUA, or 16-bit WAV files is submitted, we cannot complete the Apple Digital Mastering process.
The second part of the mastering process happens during the mastering session. Using tools provided by Apple, the mastering engineer will preview the mastered files through the same encoding process that Apple will use to create the AAC files that will be sold through iTunes. Based on that preview the engineer may make some adjustments to the mastered files in order to optimize the sound after the encoding process is completed. Another tool alerts the engineer to any clipping of the audio signal that is occuring during the AAC conversion. Based on this info the engineer can reduce the overall volume to avoid this clipping.
The result of this process is a file submitted to Apple that will yield the highest quality conversion to an AAC file for sale on iTunes.
Since the Apple Digital Mastering process does add time to a mastering session there will be an additional charge of $10 per track when a client is requesting this service. In order to request this service, please call us at 1-888-296-2747 to get a custom mastering quote.
To submit Apple Digital Master files to iTunes you will need to do a second submission through CD Baby.
