diff --git a/web/src/lib/libav.ts b/web/src/lib/libav.ts
index 40da0d2e..1dcee27c 100644
--- a/web/src/lib/libav.ts
+++ b/web/src/lib/libav.ts
@@ -56,9 +56,14 @@ export default class LibAVWrapper {
         }
     }
 
-    static getExtensionFromType(blob: Blob) {
+    static getExtensionFromType(blob: Blob | File) {
+        const canonicalExtension = blob instanceof File && blob.name.split('.').pop()?.toLowerCase();
         const extensions = mime.getAllExtensions(blob.type);
-        const overrides = ['mp3', 'mov'];
+
+        if (canonicalExtension && extensions?.has(canonicalExtension))
+            return canonicalExtension;
+
+        const overrides = ['mp3', 'mov', 'opus'];
 
         if (!extensions)
             return;
diff --git a/web/src/lib/types/libav.ts b/web/src/lib/types/libav.ts
index eed54edf..c0a19e1a 100644
--- a/web/src/lib/types/libav.ts
+++ b/web/src/lib/types/libav.ts
@@ -7,7 +7,7 @@ export type FileInfo = {
 }
 
 export type RenderParams = {
-    blob: Blob,
+    blob: Blob | File,
     output?: FileInfo,
     args: string[],
 }