3 ms·

> it is not possible to say it is indistinguishable for all samples, present and future. Are there likely to be real-world cases where this happens - and the

> it is not possible to say it is indistinguishable for all samples, present and future. Are there likely to be real-world cases where this happens - and the effect is detrimental enough to actually matter to anyone? Surely we're debating "when is it good enough for anyone sane and reasonable?" not "when could a hypothetical oracle be fooled 100%"?

marcan_42 5y ago
It is useful to make the distinction, because some people do want to have the highest available quality (and this is not, inherently, a bad thing) - having a hard line that separates out the minor, but nonzero effects, from the pure snake oil, is useful. And as I said, really, the main reason to avoid lossy compression at this point is due to generational loss and post processing. Lossy compression should be considered a final processing step - what you do to store music that is then going to be delivered directly to a listener, unaltered. If you're going to do anything else, you'd do much better with a lossless version. That is not to say, of course, that if all you have is a lossy version, it is a major problem :-) For the record, my lossy format of choice for e.g. putting stuff on my phone is 96kbps Opus. Even that much is excellent for casual listening. But I much prefer to keep lossless FLACs as my primary archival storage - not just because that way I can take advantage of better compression formats as they come (e.g. how I moved from ~130k Vorbis to ~96k Opus), but also because compression makes a massive difference with certain kinds of processing and editing which I sometimes enjoy doing. All the psychoacoustics go out the window if you start doing things like subtracting instrumental mixes from full mixes to get vocal tracks out.
nitrogen 5y ago
I've commented in the past about a song that is annoyingly altered in 320k MP3: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&query=%22planet%20funk%22%20nitrogen&sort=byPopularity&type=comment https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
- andybak 5y ago
  That's actually quite interesting.
- marcan_42 5y ago
  Do you have a FLAC of that around or know where I can buy one? I'm quite curious to try it myself, and see if I can figure out what happened. I wonder if it's an encoder bug, a real format limitation, or a problem with the original song (e.g. a clipping ISP issue, which would be solved by slightly reducing the volume before encoding).

marcan_42 5y ago

It is useful to make the distinction, because some people do want to have the highest available quality (and this is not, inherently, a bad thing) - having a hard line that separates out the minor, but nonzero effects, from the pure snake oil, is useful. And as I said, really, the main reason to avoid lossy compression at this point is due to generational loss and post processing. Lossy compression should be considered a final processing step - what you do to store music that is then going to be delivered directly to a listener, unaltered. If you're going to do anything else, you'd do much better with a lossless version. That is not to say, of course, that if all you have is a lossy version, it is a major problem :-) For the record, my lossy format of choice for e.g. putting stuff on my phone is 96kbps Opus. Even that much is excellent for casual listening. But I much prefer to keep lossless FLACs as my primary archival storage - not just because that way I can take advantage of better compression formats as they come (e.g. how I moved from ~130k Vorbis to ~96k Opus), but also because compression makes a massive difference with certain kinds of processing and editing which I sometimes enjoy doing. All the psychoacoustics go out the window if you start doing things like subtracting instrumental mixes from full mixes to get vocal tracks out.

nitrogen 5y ago

I've commented in the past about a song that is annoyingly altered in 320k MP3: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&query=%22planet%20funk%22%20nitrogen&sort=byPopularity&type=comment https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...

andybak 5y ago
That's actually quite interesting.
marcan_42 5y ago
Do you have a FLAC of that around or know where I can buy one? I'm quite curious to try it myself, and see if I can figure out what happened. I wonder if it's an encoder bug, a real format limitation, or a problem with the original song (e.g. a clipping ISP issue, which would be solved by slightly reducing the volume before encoding).