Wake pacing queue waiters when Pacer is being destroyed

app/streaming/video/ffmpeg-renderers/pacer/pacer.cpp

@@ -47,6 +47,7 @@ Pacer::~Pacer()
 
     // Stop the V-sync thread
     if (m_VsyncThread != nullptr) {
+        m_PacingQueueNotEmpty.wakeAll();
         m_VsyncSignalled.wakeAll();
         SDL_WaitThread(m_VsyncThread, nullptr);
     }
@@ -244,6 +245,11 @@ void Pacer::handleVsync(int timeUntilNextVsyncMillis)
             m_FrameQueueLock.unlock();
             return;
         }
+
+        if (m_Stopping) {
+            m_FrameQueueLock.unlock();
+            return;
+        }
     }
 
     // Place the first frame on the render queue