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Wednesday, December 18, 2013

Apple iTunes: how to sync a device with a given playlist

I have a 160 GB iPod, and a 64 GB iPhone and my iTunes library is larger than 300 GB. How can you sync all or only given songs to a particular device ?

About Compression levels

My iTunes library is huge because many CD are stored in the Apple lossless format ALAC. Here are some compression ratios for a given CD.

 WAV  ALAC  AAC256K  AAC192K  AAC128K  Format
 424776   284684   77544   58280   39008   Size in KB
 100%  67.02%  18.26%  13.72%  9.18%  % ratio
 0%  -32.98%  -81.74%  -86.28%  -90.82  Compression %
Wav is the raw CD ROM uncompressed file format. ALAC is the Apple lossless format.

Another example: my playlist is 99.64 GB in iTunes and 27.57 when stored in 128 kbps on my iPhone.

How-to create and sync your iPhone/iPad with a playlist

To store selected albums/tracks/songs to your iThing you must do two things:
  1. create one playlist per device
  2. tell iTunes to compress the files to 128 Kb/s (or more) when syncing the device.
Step 1: Create a playlist by using the menu File item New then Playlist, or hit [Control]-n. Put any songs/album you want inside the playlist. 
Watch the status bar at the bottom of the iTunes window displayed values grow:

Step 2: Select the device, select the tab Summary. Down the page select the option "Convert higher bit rate songs to 128 Kbps AAC (or 192 or 256).
In the Music tab select Selected playlists, artists, albums and genres on top of the page, and the playlist on the playlists list, of course.
Press the Sync button at bottom of this page.

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