Please try this diff:
diff --git a/src/modules/core/producer_colour.c
b/src/modules/core/producer_colour.c
index 3942877f..eafa434e 100644
--- a/src/modules/core/producer_colour.c
+++ b/src/modules/core/producer_colour.c
@@ -1,6 +1,6 @@
/*
* producer_colour.c
- * Copyright (C) 2003-2017 Meltytech, LLC
+ * Copyright (C) 2003-2018 Meltytech, LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@@ -190,12 +190,18 @@ static int producer_get_image( mlt_frame frame,
uint8_t **buffer, mlt_image_form
}
// Create the alpha channel
- int alpha_size = *width * *height;
- uint8_t *alpha = mlt_pool_alloc( alpha_size );
+ int alpha_size = 0;
+ uint8_t *alpha = NULL;
// Initialise the alpha
- if ( alpha )
- memset( alpha, color.a, alpha_size );
+ if (color.a < 255 || *format == mlt_image_rgb24a) {
+ alpha_size = *width * *height;
+ alpha = mlt_pool_alloc( alpha_size );
+ if ( alpha )
+ memset( alpha, color.a, alpha_size );
+ else
+ alpha_size = 0;
+ }
// Clone our image
if (buffer && image && size > 0) {
------------------------------------------------------------------------------
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