The Master Guide / 13 Sound design and mix · Effects and beds
Real recordings from Openverse (CC0)
Openverse is a free, open search of openly licensed audio. Its sound effects and ambiences are mostly Freesound recordings. Use it for what a real recording does better than a designed effect.
Openverse is a free, open search of openly licensed audio. Its sound effects and ambiences are mostly Freesound recordings. Use it for what a real recording does better than a designed effect.
What it fills: a real Cairo street or café, rain, a crowd, room tone, foley.
CC0 only (decided). CC0 is free for any use, with no credit to manage. Never CC BY, never anything "non-commercial", even when it sounds right.
The method [best available, not yet validated]: the search works (checked 4 Nov 2026); no film has yet been finished with it.
Search in plain words, with the CC0 filter always on (steps below; the worked search shows the address). Without an account the search allows 20 requests a minute and 200 a day (4 Nov 2026).
Read each result: title, creator, source, length, its preview and the sound's own page (the fields are listed below). Results from Jamendo or ccMixter are music: skip them, because the music comes from Suno (see Music → Suno always, hero tracks included).
Shortlist from the previews. Download them, then rank them by ear, with earshot as a listening aid; for a long recording, earshot can find its best stretch (see Sound design and mix → The earshot listening check).
Check the licence at the source. Openverse copies the uploader's label, so open each landing page and confirm it still says CC0 before you use the sound. Reading the page needs no sign-in. If the page no longer says CC0, drop the sound and choose another.
Download the originals yourself. The final mix uses the original file from the sound's own page, usually WAV, sometimes FLAC or MP3; the search result gives its format and sample rate (steps below). Freesound needs a signed-in free account for originals. Save each under your effect's file name with the original's own extension.
Never render a film master or a stem with a preview inside it. After an original replaces its preview, check the timing again: an MP3 can start slightly later than its original.
Record every sound on your sources list (see Sound design and mix → The SFX list and its Lead column).
A worked search, written for this guide:
Row: 00:00.00–00:12.00 · S01 · ambience · distant · 12 s
Search (CC0 filter on):
https://api.openverse.org/v1/audio/?q=cairo+street&license=cc0&page_size=20
Result on 4 Nov 2026: five CC0 recordings, all from Freesound, among them
"Attaba squares' street vendors - Cairo" (1 min 16 s, original WAV 48 kHz) and
"Khan El Khalili bazaar .wav" (5 min 26 s, original WAV 44.1 kHz).
Narrower search q=cairo+street+vendors: the first one only.
Next: earshot find on the shortlisted file, a 12-second window, texture mode;
trim to the stretch it lists; open each landing page, confirm CC0,
download the original, record it on the sources list.
Do it yourself
Search Openverse with the CC0 filter on (openverse.org, a browser or curl)
On openverse.org, choose audio and set the licence filter to CC0.
Or use the address in the worked search above in a browser or with curl.
Read a result (the Openverse result fields)
Read the title, creator, source, length in milliseconds, url (a 128 kbps MP3 preview) and foreign_landing_url (the sound's own page).
Before you download the original, read the result's alt_files field: it gives the original's format and sample rate.