Only capture frame if num frames to capture > 0

src/main.cpp

@@ -1933,13 +1933,14 @@ int main(int argc, char **argv) {
         if (frame_time_overflow >= 0.0) {
             frame_time_overflow = std::min(frame_time_overflow, target_fps);
             frame_timer_start = time_now - frame_time_overflow;
-            gsr_capture_capture(capture, frame);
 
             const double this_video_frame_time = clock_get_monotonic_seconds();
             const int64_t expected_frames = std::round((this_video_frame_time - start_time_pts) / target_fps);
-
             const int num_frames = framerate_mode == FramerateMode::CONSTANT ? std::max(0L, expected_frames - video_pts_counter) : 1;
 
+            if(num_frames > 0) {
+                gsr_capture_capture(capture, frame);
+
                 // TODO: Check if duplicate frame can be saved just by writing it with a different pts instead of sending it again
                 for(int i = 0; i < num_frames; ++i) {
                     if(framerate_mode == FramerateMode::CONSTANT) {
@@ -1963,6 +1964,7 @@ int main(int argc, char **argv) {
                 }
                 video_pts_counter += num_frames;
             }
+        }
 
         if(save_replay_thread.valid() && save_replay_thread.wait_for(std::chrono::seconds(0)) == std::future_status::ready) {
             save_replay_thread.get();