decklinkvideosink: Handle the clock returning GST_CLOCK_TIME_NONE properly

1 files changed, 6 insertions, 4 deletions

diff --git a/sys/decklink/gstdecklinkvideosink.cpp b/sys/decklink/gstdecklinkvideosink.cpp
index daa0208d9..abaa5453e 100644
--- a/sys/decklink/gstdecklinkvideosink.cpp
+++ b/sys/decklink/gstdecklinkvideosink.cpp
@@ -422,11 +422,13 @@ gst_decklink_video_sink_prepare (GstBaseSink * bsink, GstBuffer * buffer)
   // potentially overflowing the internal queue of the hardware
   clock = gst_element_get_clock (GST_ELEMENT_CAST (self));
   if (clock) {
-    GstClockTime clock_running_time, latency, max_lateness;
+    GstClockTime clock_running_time, base_time, clock_time, latency,
+        max_lateness;
 
-    clock_running_time = gst_element_get_base_time (GST_ELEMENT_CAST (self));
-    if (clock_running_time != GST_CLOCK_TIME_NONE) {
-      clock_running_time = gst_clock_get_time (clock) - clock_running_time;
+    base_time = gst_element_get_base_time (GST_ELEMENT_CAST (self));
+    clock_time = gst_clock_get_time (clock);
+    if (base_time != GST_CLOCK_TIME_NONE && clock_time != GST_CLOCK_TIME_NONE) {
+      clock_running_time = clock_time - base_time;
       latency = gst_base_sink_get_latency (GST_BASE_SINK_CAST (self));
       max_lateness = gst_base_sink_get_max_lateness (GST_BASE_SINK_CAST (self));