added device_number for devices with same name

Author: Omar-Riaz

src/test/java/net/bramp/ffmpeg/builder/FFmpegBuilderTest.java

@@ -436,8 +436,8 @@ public void testPresets() {
 
   @Test
   public void testFFmpegInputBuilder(){
-    String cmd = "-y -v info -f x11grab -s 1280x720 -r 30/1 -draw_mouse 0 -thread_queue_size 4096 " +
-            "-i :0.0+0,0 -f alsa -thread_queue_size 4096 -i hw:0,1,0 -f flv -acodec aac rtmp://a.rtmp.youtube.com/live2/XXX" ;
+    String cmd = "-y -v info -f x11grab -s 1280x720 -r 30/1 -draw_mouse 0 -thread_queue_size 4096 -video_device_number 0 " +
+            "-i :0.0+0,0 -f alsa -thread_queue_size 4096 -video_device_number 0 -i hw:0,1,0 -f flv -acodec aac rtmp://a.rtmp.youtube.com/live2/XXX" ;
     List<String> args =
             new FFmpegBuilder()
             .overrideOutputFiles(true)