diff -r a6cf5a06f02d -r 59c68fc4848e server/src/app/Libraries/Transcript/TranscriptConverterBase.php
--- a/server/src/app/Libraries/Transcript/TranscriptConverterBase.php	Sat May 28 11:49:38 2016 +0200
+++ b/server/src/app/Libraries/Transcript/TranscriptConverterBase.php	Sun May 29 16:50:17 2016 +0200
@@ -9,10 +9,13 @@
 
 abstract class TranscriptConverterBase implements Transcriptconverterinterface {
 
-    public function __construct(Document $document, $source, string $creationDate = null) {
+    public function __construct(Document $document, string $source, string $creationDate = null) {
         $this->resJSON = [];
         $this->document = $document;
-        $this->source = $source;
+
+        $this->source = new \DOMDocument();
+        $this->source->loadXML($source, LIBXML_NOCDATA|LIBXML_NOBLANKS);
+
         $this->creationDate = $creationDate;
         $this->mediaRefId = null;
         if(is_null($this->creationDate)) {
@@ -77,7 +80,9 @@
         $i = 1;
         foreach($this->document->getMediaArray() as $documentMedia)
         {
-            if(0 !== strpos($documentMedia['format'], 'audio/')) {
+            if((0 !== strpos($documentMedia['format'], 'audio/')) &&
+               (0 !== strpos($documentMedia['format'], 'video/')) &&
+               (0 !== strpos($documentMedia['format'], 'Sampling:')) ) {
                 continue;
             }