File _service:tar_git:001-set-some-properties-using-envvars.patch of Package gst-plugins-base

Allow to override default property values for a new playbin object.
  GST_PLAYBIN_FLAGS for flags
  GST_PLAYBIN_BUFFER_SIZE for buffer_size
--- gst/playback/gstplaybin2.c	Mon Dec 31 16:18:13 2018
+++ gst/playback/gstplaybin2.c	Mon Dec 31 16:25:40 2018
@@ -1558,7 +1558,13 @@
       g_object_new (GST_TYPE_PLAY_SINK, "name", "playsink", "send-event-mode",
       1, NULL);
   gst_bin_add (GST_BIN_CAST (playbin), GST_ELEMENT_CAST (playbin->playsink));
-  gst_play_sink_set_flags (playbin->playsink, DEFAULT_FLAGS);
+
+  GstPlayFlags flags = DEFAULT_FLAGS;
+  char * eflags = g_getenv("GST_PLAYBIN_FLAGS");
+  if(eflags != NULL)
+    flags = strtoll(eflags, NULL, 0);
+  gst_play_sink_set_flags (playbin->playsink, flags);
+
   /* Connect to notify::volume and notify::mute signals for proxying */
   g_signal_connect (playbin->playsink, "notify::volume",
       G_CALLBACK (notify_volume_cb), playbin);
@@ -1572,7 +1578,13 @@
   playbin->current_text = DEFAULT_CURRENT_TEXT;
 
   playbin->buffer_duration = DEFAULT_BUFFER_DURATION;
-  playbin->buffer_size = DEFAULT_BUFFER_SIZE;
+
+  gint buffer_size = DEFAULT_BUFFER_SIZE;
+  char * ebs = g_getenv("GST_PLAYBIN_BUFFER_SIZE");
+  if(ebs != NULL)
+    buffer_size = strtoll(ebs, NULL, 0);
+  playbin->buffer_size = buffer_size;
+
   playbin->ring_buffer_max_size = DEFAULT_RING_BUFFER_MAX_SIZE;
 
   playbin->force_aspect_ratio = TRUE;