diff --git a/ffmpegthumbnailer/moviedecoder.cpp b/ffmpegthumbnailer/moviedecoder.cpp
--- a/ffmpegthumbnailer/moviedecoder.cpp
+++ b/ffmpegthumbnailer/moviedecoder.cpp
@@ -62,6 +62,8 @@
 
     QFileInfo fileInfo(filename);
 
+    av_register_all();
+
     if ((!m_FormatContextWasGiven) && avformat_open_input(&m_pFormatContext, fileInfo.absoluteFilePath().toLocal8Bit().data(), NULL, NULL) != 0) {
         qDebug() <<  "Could not open input file: " << fileInfo.absoluteFilePath();
         return;