diff -r 56cd8111b7f7 -r 41300fa6a67c src/multimedia/video/qimagevideobuffer.cpp
--- a/src/multimedia/video/qimagevideobuffer.cpp	Tue Jan 26 12:42:25 2010 +0200
+++ b/src/multimedia/video/qimagevideobuffer.cpp	Tue Feb 02 00:43:10 2010 +0200
@@ -85,7 +85,7 @@
         d->mapMode = mode;
 
         if (numBytes)
-            *numBytes = d->image.numBytes();
+            *numBytes = d->image.byteCount();
 
         if (bytesPerLine)
             *bytesPerLine = d->image.bytesPerLine();