Surface failed video configuration and camera capture stalls

tools/chatgui/src/call_video_engine.cpp

@@ -153,6 +153,7 @@ void CallVideoEngine::transmit() {
     while (m->running) {
         struct call_video_port_status state{};
         if (call_video_port_status(m->id, &state) < 0) break;
+        if (state.error) { m->report(tr("Core rejected video format")); break; }
         uint64_t revision; bool enabled; int width, height, codec; int64_t pts;
 #ifdef HAVE_STREAM_CAPTURE
         QVideoFrame raw;