Freesound Forums

I noticed several shrill sonic artifacts (random and short high-frequence noises) after uploading some sounds.
For example in this choir around the -04:15 minute mark:
https://freesound.org/people/ptrflr/sounds/391485/

Or in some of my own uploads:
https://freesound.org/people/Breviceps/sounds/452999/

https://freesound.org/people/Breviceps/sounds/449270/

The original file has none of these artifacts. So is it an artifact through upload compression?
How can you get rid of them?

Here is an explanation by frederic:

frederic.font wrote:
When you listen to the sounds before downloading (on the site), you're listening to mp3 or ogg previews of the sounds encoded in relatively low bit rates to save bandwidth. No (dynamics) compression is applied at all out of that that the mp3 or ogg encoder itself might add (which should be minimal or none).

When you download the sound you get the exact same original file that was uploaded, no transcoding nor any kind of editing at all.

From: https://freesound.org/forum/bug-reports-errors-and-feature-requests/38610/

Also on the Help page:
https://freesound.org/help/faq/#i-hear-a-high-pitched-squeaking-in-the-audio-preview-what-is-that

So unfortunately, it can't be gotten rid of (at least, for now!). So you could put a little note in your sound descriptions saying something like "sound always better when downloaded", which is what I and some others do.

Thank you!
So it's just a preview issue!