restore RTSP_SERVER_PATH variable when using runOnDemand

main_test.go

@@ -481,7 +481,7 @@ func TestRunOnDemand(t *testing.T) {
 	stdin := []byte("\n" +
 		"paths:\n" +
 		"  ondemand:\n" +
-		"    runOnDemand: ffmpeg -hide_banner -loglevel error -re -i test-images/ffmpeg/emptyvideo.ts -c copy -f rtsp rtsp://localhost:8554/ondemand\n")
+		"    runOnDemand: ffmpeg -hide_banner -loglevel error -re -i test-images/ffmpeg/emptyvideo.ts -c copy -f rtsp rtsp://localhost:8554/$RTSP_SERVER_PATH\n")
 	p1, err := newProgram([]string{"stdin"}, bytes.NewBuffer(stdin))
 	require.NoError(t, err)
 	defer p1.close()

path.go

@@ -229,7 +229,7 @@ func (pa *path) onDescribe(client *client) {
 				pa.lastDescribeActivation = time.Now()
 
 				var err error
-				pa.onDemandCmd, err = startExternalCommand(pa.confp.RunOnDemand, "")
+				pa.onDemandCmd, err = startExternalCommand(pa.confp.RunOnDemand, pa.name)
 				if err != nil {
 					pa.log("ERR: %s", err)
 				}