←back to thread

Useful built-in macOS command-line utilities

(weiyen.net)
837 points yen223 | 6 comments | 06 Nov 24 05:51 UTC | HN request time: 1.24s | source | bottom
Show context
daneel_w ◴[06 Nov 24 16:42 UTC] No.42064988[source]▶
A couple more:

    afconvert(1) - an audio file format converter, which includes Apple's superior AAC codec from the Core Audio framework

    diskutil(8) - tons of tools for fixed and removable storage
Examples:

    afconvert in.wav -o out.m4a -q 127 -s 2 -b 160000 -f m4af -d 'aac '

    mb=300; diskutil eraseVolume APFS myramdisk `hdiutil attach -nomount ram://$((mb*2048))`
replies(6): >>42065488 #>>42066466 #>>42068656 #>>42068717 #>>42075363 #>>42076594 #
hk1337 ◴[06 Nov 24 18:03 UTC] No.42066466[source]▶
How does that compare with ffmpeg? The arguments seem about the same.
replies(2): >>42067194 #>>42067397 #
krackers ◴[06 Nov 24 18:45 UTC] No.42067194[source]▶
afcovert uses the superior inbuilt AAC converter. FFmpeg can do this as well with the right arguments but you have to dig them up and the quality is capped to a lower value than you can get with afconvert.
replies(2): >>42068952 #>>42084868 #
1. anthk ◴[06 Nov 24 20:37 UTC] No.42068952[source]▶
There's no reason to use AAC when we have both OPUS and FLAC.
replies(2): >>42069139 #>>42080737 #
2. daneel_w ◴[06 Nov 24 20:49 UTC] No.42069139[source]▶
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.
replies(2): >>42077456 #>>42080774 #
3. anthk ◴[07 Nov 24 15:26 UTC] No.42077456[source]▶
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.

replies(1): >>42079172 #
4. daneel_w ◴[07 Nov 24 18:07 UTC] No.42079172{3}[source]▶
> 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.

5. ok_computer ◴[07 Nov 24 20:41 UTC] No.42080737[source]▶
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.

6. ok_computer ◴[07 Nov 24 20:44 UTC] No.42080774[source]▶
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.