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iTunes "convert higher bitrate songs"

The title says it all, for users with a lot of music encoded at 320 kbps, converting everything to 256 kbps is both time-consuming and hurts the audio quality.

Please, Apple, add a 320 kbps option!

stp

Click here and fill out the form.

(147265)

Have you really done a blind test to see if you can truly distinguish 320k and 256k?  If you really think there is a difference you may wish to encode to Apple Lossless instead.

Hi Stephen,

320 kbps is supported, for both MP3 and AAC. If you have a large collection of 320 kbps tracks, iTunes won't change them unless you tell it to.

For importing new tracks, or converting existing tracks in your library, you can set the bitrate to whatever you like (up to 320, which is the highest available in the MPEG standard) in iTunes > Preferences > General > Import Settings. You can also use VBR (variable bitrate) to achieve high fidelity more efficiently, in terms of file size. As Limnos says, if you really want high fidelity you can go with Apple Lossless, which creates files roughly 3x as large.

The "convert higher bitrate" option is only intended for tracks being synced to an iOS device, in order to save space on, say, your iPhone. The original track in your iTunes library does not change.

Good point richard grant.

stephentravispope: If you want 320k then just sync your tracks are they are. That setting is for on-the-fly conversion during syncing.  The only time you might want a 320k convert bitrate option would be if your tracks were lossless on the computer and you wanted on-the-fly re-coding while syncing so no permanent 320k files were produced on the computer. Usually people do not use mobile devices with high fidelity sound systems or environments, and 256k (Apple's standard) is considered sufficient, particularly given the extra space required by 320k and the limited storage on mobile devices. 

There is certainly an audible difference between a 320 kbps file and one that has been transcoded from 320 to 256 kbps.

I have a mixed data set with 320 kbps files, many 2490 kbps files (24/96 audio encoded as Apple Lossless), and even some 4608 kbps files (24/96 uncompressed audio). The latter 2 kinds can't even be copied to the phone without data reduction, and the highest bitrate offered is 256 kbps. This is what leads to my question.

As to telling the difference between 320k and 256k, if you can't tell the difference, buy better headphones, or use an outboard DAC with your phone. I use Sennheiser HD800s or Etymotic HF3s.

Well, "click" where recommended and wait, or create a second copy of all your files using the regular iTunes conversion feature at 320k for syncing.

I did both of these. I was just hoping that more people would support the idea instead of blocking it, asking if I'd done blind tests, or providing useless suggestions that expect the user to compensate for Apple's poor app quality.

This is primarily a technical question and answer forum.  You could get 100 people to agree with you but frankly the people who are going to read it on here are going to be users like myself who kind of have to filter through the background noise to find the stuff we can actually help with.   In fact polls are specifically against the terms of use of the site.

I fully agree; I wasn't the one who brought up whether one can hear the difference between 256 and 320 kbps. My question was.

why is 256 kbps the highest rate supported?

Exactly what I did,

Thanks.

最后更新：2017-08-18 16:18:09

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