I have ~100 users downloaded ~1000 of my files in the last week alone. Music piracy is still alive and kicking. I encourage everyone to download and install SoulseekQT/Nicotine+/Seeker-Android and share whatever kind of music you have for everybody to download. Let's bring back music piracy!
There are a few key things that you’d notice between high quality and very low quality audio. Mostly, a loss of information, which would result in a muffled audio, a lack of crispy sounds and a loss of general clarity, as well as unpleasant distortion and other made-up noise at worst.
For 99.9% of people, it’s not really an mp3 vs wav/aiff comparison, but rather a kbps comparison. High quality mp3 (320kbps) is usually indistinguishable from lossless formats for most people.
For a good reasonable idea, compare 128kbps vs 320kbps at the bottom of this page and pay attention to the cymbals and other high-pitched sounds. You should notice that 128kbps sounds a bit more opaque, like it loses a lot of its spark, whereas 320 sounds crisp and clearer.
That being said, it’s not a huge difference unless you go below 128, and there’s no point in listening to wav and lossless files if you use Bluetooth, since Bluetooth hard-caps all your rates at 320kbps anyway. But I think it’s fairly noticeable anyway.
Well my collection of FLACs are about 500GB. That's about 16k songs with a total runtime of 52 days. I don't think that's too bad.
If you are really short on disk space I'd still rather download FLAC and transcode to opus @128kbps or maybe less yourself. It's transparent and even smaller than mp3. I use that to fit everything on my phone which takes about 70GB.
YouTube has audio in Opus format@~150kbit/s. Opus is a much better format than MP3. Almost all audio is completely transparent at that bitrate, where with MP3s, there are cases where audio is not transparent without using non standard >320kbit/s bitrates (a lot of content is transparent @320kbits/s though).
Now, sites/tools like the one you mentioned take the Opus (or AAC) file/stream from YouTube, and lossily re-encodes it again, probably to a file that is larger than the original, with at best the same quality, but probably worse quality. You obviously can't get better output than the input in lossy compression.
So, the disk space argument is weird if you can play Opus/AAC (should be playable on every device nowadays).
This is the valid part for why you shouldn't use YT-to-MP3 converters.
But there are also invalid reasons why people will tell you it's shit:
They think all MP3s sound like the shit ones from a decade (or two, or three) ago, using low bitrates and/or created with shit encoders. In reality, not all MP3s sound like shit, but vigilance is needed at every encoding step, as is the case with all lossy conversions.
They are conflating the quality of the conversion, with the quality of the source, and think the bad quality of some user-uploaded YouTube content is due to the lossy conversion done by YouTube, and/or the MP3 converter re-encoding from YouTube. Content uploaded by the copyright holders (assuming basic competence) does not have that problem at all.
Soulseek is an old-style P2P network. It has nothing to do with my parent comment. I personally don't use it (see my other comments in this thread).
If you want to grab a non-reencoded file from YouTube, you can use a tool like yt-dlp
# see what formats are available for a YT vid
yt-dlp -F <youtube-url>
# format 251 is usually available as the highest quality Opus format
yt-dlp -f 251 <youtube-url>
That last command should grab you an Opus stream in WEBM format.
If you're not a CLI guy, others should be able to give you a good GUI recommendation.
I mostly listen to jazz, blues and classical. I use rutracker which has everything I want and in lossless formats. Mp3s too but I'm more interested in lossless.
You are very welcome! I use it with aria2, it's opcional but recommended, in case you don't want it you can strip the --external-downloader and -args part :)