THETA X USB Live Stream on Linux with OpenCV

craig · April 17, 2025, 2:38am

@lg22 this document is a reference:

Unless you have another camera on the Raspberry Pi, you need to set the device to /dev/video0

github.com/codetricity/libuvc-theta-sample

gst/gst_viewer.c

60c49c561


      
          
          	cmd_name = rindex(argv[0], '/');
          	if (cmd_name == NULL)
          		cmd_name = argv[0];
          	else
          		cmd_name++;
          
          	if (strcmp(cmd_name, "gst_loopback") == 0)
          		pipe_proc = "decodebin ! autovideoconvert ! "
          			"video/x-raw,format=I420 ! identity drop-allocation=true !"
          			"v4l2sink device=/dev/video1 qos=false sync=false";
          	else
          		pipe_proc = " decodebin ! autovideosink sync=false";
          
          	if (!gst_src_init(&argc, &argv, pipe_proc))
          		return -1;
          
          	res = uvc_init(&ctx, NULL);
          	if (res != UVC_SUCCESS) {
          		uvc_perror(res, "uvc_init");
          		return res;

If you are on a Raspberry Pi, you should set the resolution to 2K.

github.com/codetricity/libuvc-theta-sample

gst/gst_viewer.c

60c49c561


      
          	pthread_create(&thr, NULL, keywait, &src);
          
          	res = thetauvc_get_stream_ctrl_format_size(devh,
          			THETAUVC_MODE_UHD_2997, &ctrl);	
          	
          	if (argc > 1 && strcmp("--format", argv[1]) == 0) {
          		if (argc > 2 && strcmp("4K", argv[2]) == 0) {
          			printf("THETA live video is 4K");
          			res = thetauvc_get_stream_ctrl_format_size(devh,
          				THETAUVC_MODE_UHD_2997, &ctrl);	
          		} else if (argc > 2 && strcmp("2K", argv[2]) == 0) {
          			printf("THETA live video is 2K");
          			res = thetauvc_get_stream_ctrl_format_size(devh,
          				THETAUVC_MODE_FHD_2997, &ctrl);				
          		}
          		
          		else {
          			printf("specify video device. --format 4K or --format 2K\n");
          			goto exit;
          		}

I have not gotten the streaming working with a Raspberry Pi, only a Jetson Nano. I don’t believe the Raspberry Pi has 4K hardware decoding.

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THETA X USB Live Stream on Linux with OpenCV

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