I have itunes on my pc.
You can use Windows Media Player to transfer any media from iTunes to your s5.
And if you connect the s5 to a USB 3.0, the transfer is really fast.
You can choose to transfer the media to your SD card, or to internal memory.
Media Player also automatically converts different formats so they will play nice with your phone.
I don't know the answer concerning apple computers, this is my experience with Windows.
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