Printing Gstreamer location and version info at runtime

src/processing/video/Video.java

@@ -59,6 +59,8 @@ public class Video implements PConstants {
 
   protected static boolean defaultGLibContext = false;
 
+  protected static boolean useGstreamerSystemInstall = false;
+
   protected static long INSTANCES_COUNT = 0;
 
   protected static int bitsJVM;
@@ -142,15 +144,52 @@ static protected void initImpl() {
     String[] args = { "" };
     Gst.setUseDefaultContext(defaultGLibContext);
     Gst.init("Processing core video", args);
-
+   
     // instead of setting the plugin path via scanPath(), we could alternatively
     // also set the GST_PLUGIN_PATH_1_0 environment variable
-    addPlugins();
+	addPlugins();
+
+
+	// output GStreamer version, lib path, plugin path
+	// and whether a system install is being used
+	printGStreamerInfo();
   }
 
+  static protected void printGStreamerInfo() {
+
+	  String output = "";
+	  System.out.println("Gstreamer Version: " + Gst.getVersionString());
+
+	  if(useGstreamerSystemInstall) {
+	    	output = "Using System Install Gstreamer: ";
+
+	    	// get x64-bit root of GStreamer install
+	    	if(System.getenv("GSTREAMER_1_0_ROOT_X86_64") != null && bitsJVM == 64) {
+	    		output += System.getenv("GSTREAMER_1_0_ROOT_X86_64");
+	    	}
+
+	    	// get x32-bit root of GStreamer install
+	    	else if(System.getenv("GSTREAMER_1_0_ROOT_X86") != null && bitsJVM == 32) {
+	    		output += System.getenv("GSTREAMER_1_0_ROOT_X86");
+	    	}
+
+	    	else {
+	    		output += "Unknown location, please set GSTREAMER_1_0_ROOT_X86(_64) to where GStreamer is installed";
+	    	}
+
+	    	System.out.println(output);
+	  }
+
+	  // simply output gstreamerLibPath and gstreamerPluginPath when using bundled GStreamer
+	  else {
+		    System.out.println("Gstreamer Library Path: " + gstreamerLibPath);
+		    System.out.println("Gstreamer Plugin Path: " + gstreamerPluginPath);
+	  }
+
+}
 
   static protected void addPlugins() {
-    if (!gstreamerPluginPath.equals("")) {
+    if (!gstreamerPluginPath.equals("") && !useGstreamerSystemInstall) {
       Registry reg = Registry.get();
       boolean res;
       res = reg.scanPath(gstreamerPluginPath);
@@ -199,8 +238,9 @@ static protected String buildGStreamerLibPath(String base, String os) {
     File path = new File(base + os);
     if (path.exists()) {
       return base + os; 
-    } else {      
-      return base;  
+    } else {     	
+    	useGstreamerSystemInstall = true;  
+    	return base;  
     }
   }