From 6fc6161bc1c673dafac990871d6f9097d6e78c1a Mon Sep 17 00:00:00 2001
From: Matthew Waters <matthew@centricular.com>
Date: Sat, 12 Dec 2015 10:07:46 +1100
Subject: gltransformation: clear to transparent

Otherwise composition will result in a black frame outside the transformed
video.
---
 ext/gl/gstgltransformation.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/gl/gstgltransformation.c b/ext/gl/gstgltransformation.c
index 38b5743e1..5a82ade5f 100644
--- a/ext/gl/gstgltransformation.c
+++ b/ext/gl/gstgltransformation.c
@@ -597,7 +597,7 @@ gst_gl_transformation_callback (gpointer stuff)
   gst_gl_context_clear_shader (GST_GL_BASE_FILTER (filter)->context);
   gl->BindTexture (GL_TEXTURE_2D, 0);
 
-  gl->ClearColor (0.f, 0.f, 0.f, 1.f);
+  gl->ClearColor (0.f, 0.f, 0.f, 0.f);
   gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
   gst_gl_shader_use (transformation->shader);
-- 
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