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Mulimedia engineer and free-software enthousiast

Introducing GstPipelineStudio 0.5.1

GstPipelineStudio 0.5.1 #

Your GStreamer Pipelines, at a Glance #

New version of GstPipelineStudio is out!

After months of improvements and intermediate releases since October 2024, it’s time for an official announcement for 0.5.1.

GstPipelineStudio provides a visual interface to GStreamer, the marvelous Swiss Army knife of multimedia pipelines. But what is GStreamer exactly?

What is GStreamer? #

GStreamer is an open-source multimedia framework started in 1999. It lets you build pipelines of interconnected elements to stream, encode, decode, and manipulate media. The core idea is simple: a source element produces data, passes it through one or more transform elements, and delivers it to a sink. For example, here is a pipeline that decodes an MP3 audio file:

    filesrc --> mp3dec --> audiosink

GStreamer is written in C, with a growing ecosystem of plugins in Rust and bindings for languages such as Python and C++. It ships with many command-line tools to build and test pipelines, but validating ideas still requires writing C/Rust/Python code or using the command line. That’s where GstPipelineStudio comes in — providing a visual interface to help newcomers discover and adopt GStreamer, and skilled developers debug their pipelines.

The Story Behind GstPipelineStudio #

The GstPipelineStudio project started in 2021 with the idea to provide the same environment that brought me to multimedia: GraphEdit on Windows with DirectShow. Indeed, DirectShow and GStreamer share the same idea of plugins sharing data. As I started to implement a DVB decoder with DirectShow, the graphical interface made it easier to validate which filters to use. But DirectShow only works natively on Windows, unlike GStreamer which can run everywhere — Linux, macOS, Windows, iOS, Android, and even low-power devices such as a Raspberry Pi.

GstPipelineStudio aims to work on all these platforms, easing GStreamer adoption where its use was not always obvious, such as on Windows. GStreamer is based on GLib, a cross-platform toolkit that abstracts system calls and provides a common base layer. For the GUI, since Rust was offering very good bindings, GTK was the natural choice to achieve cross-platform support. There was an attempt to create a GUI using Qt, named pipeviz, which has been a great inspiration for GPS, but the Qt Rust bindings were not mature enough, unlike those for GTK.

The first official release of GPS was 0.3.4, and you can read its official blog post published in 2023. Since then, we have been devoted to providing new features to bring GPS to another level.

A first revision, GPS 0.4.0, came out before Christmas 2024 with a refreshed interface — including zoom on the graph and contextual menus on any element or pad of the pipeline. The versions of GStreamer and GTK have also been updated to get the latest plugins and features from both frameworks. A new icon has also been introduced to let GPS dive into another dimension.

What’s New in 0.5.1 #

0.5.1 is here, and it brings a game changer: the dot file reader. Previously, it was possible to open a command-line pipeline or save/open pipelines with an XML-based format, but now you can also open the generated dot files, the native format in GStreamer, to display a pipeline graphically. This is still a beta version as it can only display high-level pipelines such as those described with the command line. Nevertheless this is a great improvement and allows users to see their pipeline and manipulate it.

Here is the list of other improvements you’ll find in this release:

Remote Pipeline Introspection #

The remote pipeline introspection is a new way to connect to the WebSocket tracer available in GStreamer, pipeline-snapshot. In addition to dot file loader, it allows you to visualize a pipeline directly in GPS from an external process running with the tracer.

As you may know, GStreamer pipelines can be very complex, so one dream was to be able to visualize them live. There is already a mini tool in GStreamer named gst-dots-viewer which creates a web server to display pipelines in a browser from the $XDG_CACHE_DIR folder, see the blog post from Thibault about it.

Now with GPS, you can directly create a WebSocket server and let the tracer connect to it and provide available dot files to be displayed.

For example, to visualize a running pipeline in GPS:

  1. In GPS: Menu → Remote Pipeline → Listen…
  2. Enter the WebSocket address (e.g., ws://localhost:8080)
  3. Run your GStreamer pipeline with the pipeline-snapshot tracer:
GST_TRACERS="pipeline-snapshot(dots-viewer-ws-url=ws://localhost:8080)" \
  gst-launch-1.0 videotestsrc ! autovideosink

The pipeline graph will appear in GPS once the tracer connects.

These dot files are converted to GPS pipelines, making it possible to modify them. That’s a first step for real interaction with GStreamer pipelines — and there are more features coming in the pipeline.

Coming in 0.6.0 #

In parallel, a new tool named GstPrinceOfParser (gst-pop) has also been implemented. This tool allows remote control of all pipelines instantiated locally or over the network. It is a multi-pipeline daemon accessible through WebSocket or D-Bus, aiming to centralize all GStreamer options in one tool for launch, inspection, and discovery. GstPipelineStudio will be able to control this daemon, making gst-pop the backbone of the GStreamer GUI. A blog post will come soon, stay tuned…

A new tracer is under development: a WebSocket server that will allow you to inspect and interact with the current pipeline — modify the play state (pause, seek), fetch the logs, and of course see the current dot representation, all from the GstPipelineStudio interface.

In addition, more features are on the way: a new look and feel based on libadwaita on Linux/macOS/Windows, better localization, an auto-plug feature, seek and step-by-step playback, and bug fixes on demand.

We hope you’ll enjoy this new version of the tool and please feel free to propose new features with an RFC here or merge requests here.

Stay tuned for the next GStreamer Spring hackfest 2026 coming soon (end of May) where new features and deeper interaction with GStreamer pipelines will be discussed.

As usual, if you would like to learn more about GstPipelineStudio, GStreamer, or any other open multimedia framework, please contact us!