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Converting from one lossy codec another isn't generally recommended, plus you aren't likely to save that much disk space by converting to AAC.
10 GB is actually pretty small for a local music collection, quite honestly. If I were you, I would try to expand your storage capacity instead of wasting time, and potentially audio quality, by transcoding.
I have an iPhone. The storage I have is all I've got.
Don't buy iPhone
You need ffmpeg
Read this for the exact command
You can use the find command (in console) to list all mp3 files, these you can pipe into ffmpeg.
Just ask ChatGPT to write the shell script for you
Already did that. Thanks though.
By the way, owning an iPhone is not my choice. I'm 17 and still living with my parents, and my dad is a huge Apple fanboy. Ideally, I'd have either a Pixel with DivestOS, an Xperia with SailfishOS, a PinePhone with PostMarketOS, or an old Nokia 3210; but for now I'm stuck with my second hand iPhone SE.
You could consider running a plex server and using Plexamp to stream from that to your phone. It’s free as of a few days ago!
If I were you, I would stick to streaming in that case.
However, if you're dead set on storing files locally and there's no other option but to transcode, then use 128kbps Opus instead of AAC - assuming that iPhones support it (I haven't checked). It's a lot more efficient.
A good converter program to use is fre:ac but don't ask me for an iOS only app because I'm not an Apple guy at all.
Doesn’t support it directly, I can’t add opus files to the iTunes library, so I had to use VLC for them, but it’s not designed to be a music player for the iPhone and the music stops after playing a couple of songs with the screen off
The app I'm using on my iPhone (foobar2000) supports OGG Opus. ~However, decoding takes about a second, resulting in a noticeable gap between songs.~
EDIT: It seems that HydrogenAudio have fixed the Opus decoding in foobar2000 Mobile.
Edit: I agree with other commenters, that it's a bad idea to convert from one lossy codec to another one! If you want to do it anyway (and your files are at least encoded with high bitrates >192k), I'd recommend this:
The best lossy audio codec by far is opus (best perceived quality vs. small file size), which also has the benefit that it's free and has got a great open source reference implementation that is also integrated in ffmpeg. So the conversion can be done with ffmpeg. I would personally use fd-find for multithreaded batch processing (using the -x option).
If possible, only convert the wav files to AAC and keep all lossy files as they are.
On Windows, nothing beats foobar for playback, tagging, and conversion support. I use Deadbeef which is like the Foobar of Linux. It has a similar user interface and a playlist format conversion tool as well. VLC also converted audio if I remember correctly?
That would be a pretty basic bash script, but as others have said, really not recommended.
If you are a Mac users (which I am assuming yes based on your preference toward AAC), the program Pine Player does an excellent job with batch conversion. Otherwise FFMPEG is probably acceptable as well.
Thanks, but I'm an openSUSE user. I was considering AAC because of a recommendation from MakeUseOf or some other tech news website.
If you have access to a Mac, use the Apple AAC encoder. It will give you better results than libfdk_aac, which itself is much better than the ffmpeg built-in aac encoder.
Don't do it, but if you decide to do it anyway, use DbPoweramp
Oh man, that's a name I haven't heard since I was a teenager. Spoon admin'd a forum I was a part of back then.
You can use ffmpeg command line with some loop (for) tricks. If you want to save some space without re converting them, use .flac or .mka container with -copy flags