From 62415dd9e8706894860754a8f7a43c21abe3cb68 Mon Sep 17 00:00:00 2001
From: Thijs Triemstra <info@collab.nl>
Date: Mon, 8 Mar 2021 19:59:16 +0100
Subject: [PATCH] saveAs: check for extended mimetype

fixes #731
---
 dev/Cross-Browser-Declarations.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dev/Cross-Browser-Declarations.js b/dev/Cross-Browser-Declarations.js
index 9b007987..4bfa47c7 100644
--- a/dev/Cross-Browser-Declarations.js
+++ b/dev/Cross-Browser-Declarations.js
@@ -153,7 +153,10 @@ function invokeSaveAsDialog(file, fileName) {
     }
 
     var fileExtension = (file.type || 'video/webm').split('/')[1];
-
+    if (fileExtension.indexOf(';') !== -1) {
+        // extended mimetype, e.g. 'video/webm;codecs=vp8,opus'
+        fileExtension = fileExtension.split(';')[0];
+    }
     if (fileName && fileName.indexOf('.') !== -1) {
         var splitted = fileName.split('.');
         fileName = splitted[0];