properly join the video thread

flake.nix

@@ -48,7 +48,7 @@
           patchelf
         ];
 
-        # for some reason, buildInputs performs some magic an converts them to build dependencies, not runtime dependencies
+        # for some reason, buildInputs performs some magic and converts them to build dependencies, not runtime dependencies
         # also, non static dependencies (?? how to ensure ??)
         dlopenBuildInputs = with pkgs; [
           dbus

src/frame_streams/sdl/sdl_video_frame_stream2.cpp

@@ -23,6 +23,10 @@ SDLVideo2InputDevice::SDLVideo2InputDevice(const SDL_CameraID dev) : _dev(dev) {
 }
 
 SDLVideo2InputDevice::~SDLVideo2InputDevice(void) {
+	if (_thread.joinable()) {
+		assert(_ref == 0);
+		_thread.join();
+	}
 }
 
 std::shared_ptr<FrameStream2I<SDLVideoFrame>> SDLVideo2InputDevice::subscribe(void) {