Index: /trunk/src/VBox/Main/src-client/EbmlWriter.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/EbmlWriter.cpp	(revision 65330)
+++ /trunk/src/VBox/Main/src-client/EbmlWriter.cpp	(revision 65331)
@@ -433,5 +433,5 @@
         /** @todo Implement track's "Language" property? Currently this defaults to English ("eng"). */
 
-        uint8_t uTrack = m_mapTracks.size();
+        uint8_t uTrack = (uint8_t)m_mapTracks.size();
 
         WebMTrack *pTrack = new WebMTrack(WebMTrackType_Audio, uTrack, RTFileTell(m_Ebml.getFile()));
@@ -472,5 +472,5 @@
         return VINF_SUCCESS;
 #else
-        RT_NOREF(uHz, cChannels, cBits);
+        RT_NOREF(uHz, cChannels, cBits, puTrack);
         return VERR_NOT_SUPPORTED;
 #endif
@@ -482,5 +482,5 @@
         m_Ebml.serializeUnsignedInteger(TrackNumber, (uint8_t)m_mapTracks.size());
 
-        uint8_t uTrack = m_mapTracks.size();
+        uint8_t uTrack = (uint8_t)m_mapTracks.size();
 
         WebMTrack *pTrack = new WebMTrack(WebMTrackType_Video, uTrack, RTFileTell(m_Ebml.getFile()));