Why is RTSP Video Lagging in QGroundControl Daily (Master), but Works Fine in 4.4.3?

Aashish_Dhakal · April 25, 2025, 2:40am

Hi everyone,

I’m facing an issue with RTSP video lag in the QGroundControl Daily (master) version.

I’m using the following setup:

1.Cube Orange+

2.SIYI MK15E remote controller

3.SIYI A8 Mini camera (RTSP stream)

** Problem:**
I have tested on both QGC 4.4.3 and QGC Daily (master build)

The RTSP video stream from the A8 Mini works perfectly in QGC 4.4.3.
But in the QGC Daily (master) version, the video lags heavily (8-10 seconds delay)
I haven’t changed anything : same camera, same RTSP URL, same hardware, same network.

What has changed in the QGC Daily/master branch that might be causing this RTSP lag?
Is anyone else facing the same issue with RTSP streaming in the Daily build?

Any ideas or known issues related to this would be really helpful.
Thanks in advance!

Aashish

atifhalim · May 25, 2025, 12:00am

I have the exact same issue however I am using the Siyi ZR10 Gimbal Camera. May be a Siyi issue. Works fine with QGC 4.4.3 though.

With QGroundControl Daily (Master), the video lags, and the output is frozen frames that update every ten second or so. Not much in terms of a video stream. Please help. I am viewing the stream in Siyi UniRC 7 Pro. It is an Android Based Ground Station.

I could use the stable version but there is a bug in the Survey planner where I cannot stop/hover the copter to take a picture. Selecting this option results in failure to upload the mission in Arducopter. The daily version of QGC does not have this particular issue

reference: Why is RTSP Video Lagging in QGroundControl Daily (Master), but Works Fine in 4.4.3? - #2 by Karl_Schoelpple - QGroundControl - ArduPilot Discourse

Aashish_Dhakal · May 25, 2025, 11:57pm

which android version are you using?

atifhalim · May 26, 2025, 1:33am

The Siyi UniRC 7 Pro is using the Android Version 13

Karl_Schoelpple · June 16, 2025, 12:52pm

Master is geared towards v. 5.0.2
It uses a different version of gstreamer 1.22.12 , compared to the older build versions. Also many other things have changed.
My understanding is the problem is known and a fix being worked on.

You can find more info regarding gstreamer in QGC here:

github.com/mavlink/qgroundcontrol

src/VideoManager/VideoReceiver/GStreamer/README.md

7e44af13f

# QGroundControl

## Video Streaming

QGroundControl implements an UDP RTP and RSTP video streaming receiver in its Main Flight Display using GStreamer.
Current suggested version of GStreamer is **1.22.12** - other versions of GStreamer may break the build as some dependent libraries may change.
To build video streaming support, you will need to install the GStreamer development packages for the desired target platform.

If you do have the proper GStreamer development libraries installed where QGC looks for it, the QGC build system will automatically use it and build video streaming support. If you would like to disable GStreamer video streaming support, set the **QGC_ENABLE_GST_VIDEOSTREAMING** CMake option to **OFF**.

### Gstreamer logs

For cases, when it is need to have more control over gstreamer logging than is availabe via QGroundControl's UI, it is possible to configure gstreamer logging via environment variables. Please see https://developer.gnome.org/gstreamer/stable/gst-running.html for details.

### UDP Pipeline

For the time being, the RTP UDP pipeline is somewhat hardcoded, using h.264 or h.265. It's best to use a camera capable of hardware encoding either h.264 (such as the Logitech C920) or h.265. On the sender end, for RTP (UDP Streaming) you would run something like this:

h.264

This file has been truncated. show original

You can try different versions of gstreamer in your build and see what happens. But apparently some versions will break the build.

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Why is RTSP Video Lagging in QGroundControl Daily (Master), but Works Fine in 4.4.3?

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