MP4: be more picky wrt VC-1 profiles we accept

Maybe it could work with VC-1 Main, but no samples so far

modules/demux/mp4/libmp4.c

@@ -1369,6 +1369,12 @@ static int MP4_ReadBox_dvc1( stream_t *p_stream, MP4_Box_t *p_box )
     p_dvc1 = p_box->data.p_dvc1;
 
     MP4_GET1BYTE( p_dvc1->i_profile_level ); /* profile is on 4bits, level 3bits */
+    if( p_dvc1->i_profile_level & 0xf0 >> 4 != 0x06 )
+    {
+        msg_Warn( p_stream, "unsupported VC-1 profile, please report" );
+        MP4_READBOX_EXIT( 0 );
+    }
+
 
     p_dvc1->i_vc1 = p_box->i_size - 7; /* Header + profile_level */