He wants to play them on a modern car stero. It's 100% not going to support FLAC, a 128kbps vbr MP3 is going to be supported pretty much anywhere.
My four year old Kenwood plays FLAC without issue, so does the OEM headset in my month-old '22 CX5
FLAC is open source, if anything I would expect that to make it easier for manufacturers to include in a firmware release.
That's interesting that the OEM unit plays FLAC. That must be something recent, my 2018 will only play MP3. I'm sure it plays apple shit too, but who cares about that.
I don't really count replacement units, cars are getting to the point where you can't replace the OEM head.
The Mazda owners manual doesn't mention it, but it's there. It's actually sent me down a rabbit hole on how to format a 256gb thumbdrive in FAT32, technically possible under FAT32 specifications, but windows hasn't allowed it, moving on to try it with Linux next.
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