Add m4b as a type of audio/mp4

This is commonly used for audiobooks
jshttp · Jan 15, 2025 · c489c6b · c489c6b
1 parent ba984a1
commit c489c6b
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/custom-types.json b/src/custom-types.json
@@ -527,6 +527,11 @@
   },
   "audio/mp4": {
     "compressible": false
+    "extensions": ["m4b"],
+    "notes": "m4b is used for bookmarkable mp4 files, especially audiobooks or podcasts",
+    "sources": [
+      "https://www.loc.gov/preservation/digital/formats/fdd/fdd000052.shtml#sign"
+    ]
   },
   "audio/mpeg": {
     "compressible": false