# Error on running gst_rtsp_server, can not get Postionn

Source: https://forum.modalai.com/topic/887/error-on-running-gst_rtsp_server-can-not-get-postionn
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2022-04-26 14:13:36 UTC by Nathan Ni
Replies: 3 · Views: 818

## Nathan Ni · 2022-04-26 14:13:36 UTC

Using visual indoor positioning, the flight control can't get the position information of VOXL and QGC can't get the position information of XY, there is the position information of Z axis.
Reported error: gst_rtsp_server_attach failed.
Please help!

## Reply by Nathan Ni · 2022-04-26 14:16:19 UTC

![12c70d78-d1b5-4713-a409-f218bd0c1b83-951a5000e5d021aae8cce8d6358cad4.jpg](https://forum.modalai.com/assets/uploads/files/1650982451419-12c70d78-d1b5-4713-a409-f218bd0c1b83-951a5000e5d021aae8cce8d6358cad4.jpg)

## Reply by Eric Katzfey (ModalAI staff) · 2022-04-26 15:59:59 UTC (in reply to Nathan Ni)

@Nathan-Ni voxl-streamer (https://docs.modalai.com/voxl-streamer/) is an application to stream video using RTSP. It has nothing to do with visual indoor positioning. Is your question about positioning errors or about video streaming?

## Reply by Eric Katzfey (ModalAI staff) · 2022-04-26 16:02:25 UTC (in reply to Nathan Ni)

@Nathan-Ni In your picture you show that voxl-streamer is already running. Then you launch another instance from the command line and get a failure. This is most likely due to not specifying a different port for the new instance. Documentation is here: https://docs.modalai.com/voxl-streamer/#viewing-output-from-multiple-connected-cameras