+using namespace std::chrono;
+
+string filename_for_frame(unsigned stream_idx, int64_t pts)
+{
+ char filename[256];
+ snprintf(filename, sizeof(filename), "frames/cam%d-pts%09ld.jpeg", stream_idx, pts);
+ return filename;
+}
+
+mutex frame_mu;
+vector<int64_t> frames[MAX_STREAMS];
+
+int thread_func();