diff --git a/application/src/File/Thumbnailer/ImageMagick.php b/application/src/File/Thumbnailer/ImageMagick.php
index 4ff71a84e1..da0a8a7bfc 100644
--- a/application/src/File/Thumbnailer/ImageMagick.php
+++ b/application/src/File/Thumbnailer/ImageMagick.php
@@ -47,7 +47,7 @@ public function create($strategy, $constraint, array $options = [])
         $mediaType = $this->sourceFile->getMediaType();
         $origPath = sprintf('%s[%s]', $this->source, $this->getOption('page', 0));
         if (strpos($mediaType, 'video/') === 0) {
-            $origPath = 'mpeg:' . $origPath;
+            $origPath = 'mp4:' . $origPath;
         }
 
         switch ($strategy) {
diff --git a/application/src/File/Thumbnailer/Imagick.php b/application/src/File/Thumbnailer/Imagick.php
index 5b404dd3fe..9e3413480e 100644
--- a/application/src/File/Thumbnailer/Imagick.php
+++ b/application/src/File/Thumbnailer/Imagick.php
@@ -32,7 +32,7 @@ public function create($strategy, $constraint, array $options = [])
         $mediaType = $this->sourceFile->getMediaType();
         $origPath = sprintf('%s[%s]', $this->source, $this->getOption('page', 0));
         if (strpos($mediaType, 'video/') === 0) {
-            $origPath = 'mpeg:' . $origPath;
+            $origPath = 'mp4:' . $origPath;
         }
 
         try {