textoverlay: make buffer writable

Make the input buffer writable before changing its contents.

diff --git a/ext/pango/gsttextoverlay.c b/ext/pango/gsttextoverlay.c
index 49d0b62..dd9c8fc 100644 (file)
--- a/ext/pango/gsttextoverlay.c
+++ b/ext/pango/gsttextoverlay.c
@@ -1561,6 +1561,8 @@ gst_text_overlay_push_frame (GstTextOverlay * overlay, GstBuffer * video_frame)
   width = overlay->image_width;
   height = overlay->image_height;
 
+  video_frame = gst_buffer_make_writable (video_frame);
+
   if (overlay->use_vertical_render)
     halign = GST_TEXT_OVERLAY_HALIGN_RIGHT;
   else