Index: csrc/com/xuggle/xuggler/Container.cpp
===================================================================
--- csrc/com/xuggle/xuggler/Container.cpp	(revision 1008)
+++ csrc/com/xuggle/xuggler/Container.cpp	(working copy)
@@ -249,6 +249,74 @@
     return retval;
   }
 
+  int cb_check_packet(struct sockaddr *from, uint8_t *buf, int bufsize) {
+    // sockaddr_in  seems to be IPv4
+    // sockaddr_in6 seems to be IPv6
+    // sockaddr     seems to be the base structure, big enough for either, returned by recvfrom.
+    struct sockaddr_in *fromaddrv4;
+	struct sockaddr_in6 *fromaddrv6;
+
+    // Received individual RTP packet; output its IP
+	printf("'Using' buf and bufsize to avoid C++ stupidly failing to build. %u %i", (unsigned int)buf, bufsize);
+
+	uint8_t octet1;
+	uint8_t octet2;
+	uint8_t octet3;
+	uint8_t octet4;
+	switch (from->sa_family) {
+		case AF_INET:
+		// IPv4
+		fromaddrv4 = (struct sockaddr_in *)from;
+		octet1 = (fromaddrv4->sin_addr.s_addr >> 0) & 255;
+		octet2 = (fromaddrv4->sin_addr.s_addr >> 8) & 255;
+		octet3 = (fromaddrv4->sin_addr.s_addr >> 16) & 255;
+		octet4 = (fromaddrv4->sin_addr.s_addr >> 24) & 255;
+		av_log(NULL, AV_LOG_ERROR, "Jez - IPv4 'from' address is: %u.%u.%u.%u\n", octet1, octet2, octet3, octet4);
+		//av_log(NULL, AV_LOG_ERROR, "Jez - len in rtpproto.c is %u", len);
+		// Accept only packets from the desired sender, or RTCP packets from localhost (these are vital, ffmpeg crashes
+		// if its own RRs are rejected...)
+		if (
+			(
+			octet1 != 86 ||
+			octet2 != 161 ||
+			octet3 != 7 ||
+			octet4 != 247
+			)
+//			&&
+//			!(
+//			is_rtcp_packet &&
+//			octet1 == 127 ||
+//			octet2 == 0 ||
+//			octet3 == 0 ||
+//			octet4 == 1
+//			)
+		) { av_log(NULL, AV_LOG_ERROR, "Jez - INVALID IP, DROPPING PACKET."); //return AVERROR(EAGAIN); }
+		return 0; }
+		//}
+		break;
+
+//			&&
+//			!(
+//			is_rtcp_packet &&
+//			octet1 == 127 ||
+//			octet2 == 0 ||
+//			octet3 == 0 ||
+//			octet4 == 1
+//			)
+
+		case AF_INET6:
+		// IPv6
+		fromaddrv6 = (struct sockaddr_in6 *)from;
+		break;
+
+		default:
+		// Something else; not supported
+		break;
+	}
+
+    return 1;
+  }
+
   int32_t
   Container :: openInputURL(const char *url,
       IContainerFormat* pContainerFormat,
@@ -271,6 +339,8 @@
     } else {
       inputFormat = 0;
     }
+    
+	mFormatContext->check_net_packet_callback = cb_check_packet;
     retval = av_open_input_file(&mFormatContext, url, inputFormat, mInputBufferLength, params);
     if (retval >= 0) {
       mIsOpened = true;
Index: csrc/com/xuggle/xuggler/Container.h
===================================================================
--- csrc/com/xuggle/xuggler/Container.h	(revision 1008)
+++ csrc/com/xuggle/xuggler/Container.h	(working copy)
@@ -26,6 +26,7 @@
 #include <com/xuggle/xuggler/FfmpegIncludes.h>
 #include <com/xuggle/xuggler/Stream.h>
 #include <com/xuggle/xuggler/StreamCoder.h>
+#include <netinet/in.h>
 
 #include <vector>
 #include <list>