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Comment by anthk | Hacker News Reader

There's no reason to use AAC when we have both OPUS and FLAC.

I have three reasons: when using a good encoder (Core Audio, FDK or Nero) it's a quality-wise better lossy format than MP3, it's smaller than FLAC which matters for storage footprint, and unlike Opus and FLAC it's supported pretty much everywhere. At some point Opus will reach the same level of adoption and that's the point where I'll make the switch from AAC, because Opus is evidently a better lossy encoder per same bitrate.

Opus is today in every smartphone. MP3's died. No one cares about AAC.

You are using Opus on most VoIP/call providers.

Meanwhile, AAC, MP3, OGG... are history today.

> You are using Opus on most VoIP/call providers.

No. Opus support in the PSTN is still unfortunately almost non-existent. Adoption is growing but the pace is very slow. Source: me, working in the European telecommunications industry for over a decade, specializing in telephony and SMS.

It’s nuts using youtube-dl and unwrapping to get the opus files are like 96kbs and sound good. 96kbs mp3 would need to mix to mono and still sound like gravel.

I like to load WAVs on my iphone if lossless uncompressed available. AAC is the next highest quality supported lossy compression file in apple music app. From my understanding they won’t ever go to flac or opus because don’t want software decompression.

I like opus on VLC for youtube-dl rips but if I’m buying music I want lossless uncompressed.

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