diff --git a/src/lib/media/video/util.ts b/src/lib/media/video/util.ts
index b80e0a4a1e..8df1e98853 100644
--- a/src/lib/media/video/util.ts
+++ b/src/lib/media/video/util.ts
@@ -40,7 +40,7 @@ export function mimeToExt(mimeType: SupportedMimeTypes | (string & {})) {
 }
 
 export function extToMime(ext: string) {
-  switch (ext) {
+  switch (ext.toLowerCase()) {
     case 'mp4':
       return 'video/mp4'
     case 'webm':