ArduCam on Raspberry Pi and video port splitter for multiple streams

Ranulphus · November 25, 2021, 1:04am

Hi there,

The Raspberry Pi cameras support 4 splitters on the video port under MMAL, so that we can have multiple resolutions and bitrates encoding simultaneously. For example, we use this to have 2 live streams on a network (eg SD and HD) and then a third stream to save to disk in the highest quality.

Can the ArduCam cameras (eg. Pivariety or MIPI such as AR1820HS) perform the same functionality?
If so, could someone point me in the right direction?

Thanks in advance

wong · November 26, 2021, 7:58am

Hi @Ranulphus
Pivariety uses libcamera, which uses the ISP provided by the Raspberry Pi, so it supports two output ports, you can refer to:

github.com

raspberrypi/libcamera-apps/blob/6145daf735fcb0a6e26699a407fe80307c24f6db/apps/libcamera_vid.cpp?_pjax=#js-repo-pjax-container, div[itemtype="http://schema.org/SoftwareSourceCode"] main, [data-pjax-container]#L61

    
      
          
          
// The main even loop for the application.
          
          
static void event_loop(LibcameraEncoder &app)
          {
          	VideoOptions const *options = app.GetOptions();
          	std::unique_ptr<Output> output = std::unique_ptr<Output>(Output::Create(options));
          	app.SetEncodeOutputReadyCallback(std::bind(&Output::OutputReady, output.get(), _1, _2, _3, _4));
          	app.StartEncoder();
          
          
	app.OpenCamera();
          	app.ConfigureVideo();
          	app.StartCamera();
          	auto start_time = std::chrono::high_resolution_clock::now();
          
          
	// Monitoring for keypresses and signals.
          	signal(SIGUSR1, default_signal_handler);
          	signal(SIGUSR2, default_signal_handler);
          	pollfd p[1] = { { STDIN_FILENO, POLLIN, 0 } };
          
          
	for (unsigned int count = 0; ; count++)