decklink: Fix crash with closed-captions signal and 10-bit input

Only free the parser if there is one. If the format hadn't changed but
had always been 10-bit, there might genuinely be no parser.

https://bugzilla.gnome.org/show_bug.cgi?id=796030

diff --git a/sys/decklink/gstdecklinkvideosrc.cpp b/sys/decklink/gstdecklinkvideosrc.cpp
index cf4e886..d2c784d 100644 (file)
--- a/sys/decklink/gstdecklinkvideosrc.cpp
+++ b/sys/decklink/gstdecklinkvideosrc.cpp
@@ -800,7 +800,7 @@ extract_cc_from_vbi (GstDecklinkVideoSrc * self, GstBuffer ** buffer,
     return;
   }
 
-  if (videoformat != self->anc_vformat) {
+  if (videoformat != self->anc_vformat && self->vbiparser) {
     gst_video_vbi_parser_free (self->vbiparser);
     self->vbiparser = NULL;
   }