idvb.h: add missing virtual

diff --git a/lib/dvb/idvb.h b/lib/dvb/idvb.h
index 66fef39..460b613 100644 (file)
--- a/lib/dvb/idvb.h
+++ b/lib/dvb/idvb.h
@@ -636,7 +636,7 @@ public:
        virtual RESULT getSTC(pts_t &pts, int num=0)=0;
        virtual RESULT getCADemuxID(uint8_t &id)=0;
        virtual RESULT flush()=0;
-       int openDVR(int flags)=0;
+       virtual int openDVR(int flags)=0;
 };
 
 #if HAVE_DVB_API_VERSION < 3 && !defined(VIDEO_EVENT_SIZE_CHANGED)