fix gstreamer 1.20 build

README.md

@@ -21,6 +21,10 @@ brew install gst-plugins-base
 brew install gst-plugins-good
 brew install gst-plugins-bad
 brew install gst-plugins-ugly
+
+
+// set GST_PLUGIN_PATH
+export GST_PLUGIN_PATH=/opt/homebrew/lib/gstreamer-1.0/
 ```
 
 Then
@@ -31,6 +35,8 @@ go get github.com/notedit/gst
 
 
 
+
+
 ## Examples
 
 https://github.com/notedit/gst-go-demo

pipeline.go

@@ -3,6 +3,11 @@ package gst
 /*
 #cgo pkg-config: gstreamer-1.0
 #include "gst.h"
+
+
+const char* ErrorMessage(GError *err) {
+    return err->message;
+}
 */
 import "C"
 
@@ -26,7 +31,7 @@ func ParseLaunch(pipelineStr string) (p *Pipeline, err error) {
 	gstElt := C.gst_parse_launch(pDesc, &gError)
 
 	if gError != nil {
-		err = errors.New("create pipeline error")
+		err = errors.New(C.GoString(C.ErrorMessage(gError)))
 		return
 	}