Gstreamer overlay image

This plugin renders text on top of a video stream. This can be either static text or text from buffers received on the text sink pad, e. If the text sink pad is not linked, the text set via the "text" property will be rendered. If the text sink pad is linked, text will be rendered as it is received on that pad, honouring and matching the buffer timestamps of both input streams.

Here is a simple pipeline that displays a static text in the top left corner of the video picture. Here is another pipeline that displays subtitles from an. Pango font description of font to be used for rendering. Toggle navigation. The text can contain newline characters and text wrapping is enabled by default. Example launch lines gst-launch What are you talking about?

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Unit is pixels. Flags : Read Default value : 0. Base-text-overlay-halign Members left 0 — left. Absolute position clamped to canvas 4 — position. Absolute position 5 — absolute. Base-text-overlay-line-align Members left 0 — left. Base-text-overlay-scale-mode Members none 0 — none. Base-text-overlay-valign Members baseline 0 — baseline. Absolute position clamped to canvas 3 — position. Base-text-overlay-wrap-mode Members none -1 — none.Search everywhere only in this topic. Advanced Search.

gstreamer overlay image

Classic List Threaded. Wolfgang Grandegger. Image overlay over a video stream. What does take that much CPU time?

gstreamer overlay image

Is there a faster way to do the overlay or is that element from the Pango plugin already quiet efficient? I want to overlay an image over the video stream, ideally done by the graphics hardware. Thanks for your help, Wolfgang. Nicolas Dufresne Re: Image overlay over a video stream.

Hello, digging deeper about text, image and graphics overlay Am So there is still quite some work. Hello, Am Would be nice to add properties for this. I think GStreamer 0. Search everywhere only in this topic Advanced Search Image overlay over a video stream. It's called software rendering with anti-aliasing and all. I see!

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The text needs to be rendered and inserted into overlayed with the video frame. The CPU usage really depends how often and what is rendered.

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Already disabling shadow or outline drawing or a smaller font reduces the CPU load. BTW, is it possible to specify the colour for the shaded background?

Is this work in progress visible somewhere, e.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to overlay a ". A working pipeline for my hardware is:. The problem comes when I try to translate this pipeline in C. The code I wrote for this pipeline runs, but there is no video playback on the display.

Fast GStreamer overlay element

The player stuck itself before setting the pipeline on "playing" state. Here, there is a simple version of my C implementation:. After many tries, I did figure out that in the C code I posted I have selected the wrong element, therefore the data.

Learn more. How to overlay a picture over a video stream with Gstreamer in C? Ask Question. Asked 2 years, 3 months ago. Active 2 years, 2 months ago. Viewed 1k times. A working pipeline for my hardware is: gst-launch Thank you. Jens Gustedt Pelux Pelux 4 4 bronze badges. It exists for easy construction of pipelines.

Basically you can use your gst-launch Thank you for the suggestion. It works, but in future I will need to have more control and maybe this can be just a temporary solution. It remains the weird fact that the same pipeline in C causes problems, unless there are errors.

Have you maybe seen something wrong or not clear? What do you mean more control? Once the pipeline is build you can access everything as you would do the hard way. From there you can access pads, probes. IT just helps you to avoid the hidden mistakes you experience right now. If you want it the hard way do error checking after each step.There are several longer range goals with utilizing the webcams, but first up is to show them on the screen.

To me, the nomenclature that they use does not match anything in the naming convention that computer programmers have used for the last 60 years. With that said, the Jetson is a little confusing on which version of Gstreamer to use. In the initial release, the documentation indicated Gstreamer 0. So with a lot of trials, here are some of the first results.

Both the Logitech and the Microsoft webcams deliver a variety of video resolutions and different encodings. In addition, the Logitech also delivers H It is straightforward to show one webcam using Gstreamer:. Basically the source is Video 4 Linux Version 2 v4l2src using video device 0.

Gstreamer calls this a capability. Because the video is encoded as MJPG a compressed imageyou have to convert it to something that the display will understand. The display is represented by xvimagesink in this example. The first thing to do is to take the video stream coming from the webcam, and decode it into raw pixel data. In this instance, I added videoscale so that the video will resize when the window is resized.

gstreamer overlay image

For storing video streams, not so much. There is only one trick that you need to know. So to start up two webcams, create a tee and send one of the webcams through it.

Mark the end of the path with the name of the teein this case splitterfollowed by a period. Then describe the next step in the pipeline. A tee may have more than two elements. Having worked around physical pipelines for a long time, my brain made sure that it let me know how much I was making it hurt with terrible metaphors.

In any case, you can wire this all up and still not know the secret ingredient to getting larger resolution webcams running on USB. It turns out that these webcams reserve the amount of bandwidth on the USB device that their maximum resolution will generate. Note: You may have to install some of the GStreamer plugins to have this work correctly:. Have you set the Jetson to run USB 3. Does the Jetson run the see3camguvcview correctly?

I am part of the camera team at e-consystems.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. USAGE for more information about these plugins and their usage. Create a build folder within the source directory and run the CMake command to configure the out-of-source build.

For a list of more options when configuring the build, refer to the CMakeLists.

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If you intend to rebuild the plugins after making changes to the source code or you would want to change some of the build options after uninstalling the plugins, it is highly recommended to simply delete the build folder that you have created and repeat the build process as above.

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No description, website, or topics provided. Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. SiewHoon Bump version 1.

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Latest commit fbce Mar 11, Search everywhere only in this topic. Advanced Search. Classic List Threaded. Overlaying an image on a live stream. Hi I am wanting to overlay an image crosshairs inthis case on top of a stream from a web cam. The image is a png file with a transparent background. Sudarshan Bisht. Re: Overlaying an image on a live stream. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance.

See why Intel Parallel Studio got high marks during beta. Additional debug info: gstbasesrc. Any ideas? Vaughan sudarshan bisht wrote. Try putting ffmpegcolorspcae after pngdec. Sent from the GStreamer-devel mailing list archive at Nabble. In reply to this post by Vogan. Re: Re: Overlaying an image on a live stream. In reply to this post by kususe.

Re: Re: Re: Overlaying an image on a live stream. Re: Re: Re: Re: Overlaying an image on a live stream. Hi, freezeimage is quite new element, so it's normal it's not present.

GStreamer xvimage

Stefan Sauer. Am Ok, thanks. But it still doesn't work. I tried to change the video format too. In reply to this post by Stefan Sauer. Search everywhere only in this topic Advanced Search Overlaying an image on a live stream. In reply to this post by kususe Am This pipleine makes not much sense.

Try something like below untested. You want to ensure that videomixer receives the same format. Free forum by Nabble. Edit this page.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Simple Gstreamer based video stream relay which can overlay text of various sorts. Text can be set by tcp clients via JSON RPC calls, allowing simply coded daemons to dynamically change text superimposed on video streams. I've tried to make it as simple to compile as possible, but this still relies upon having development packages for Gtk and GStreamer being available.

I've only built it in LinuxMint16, where the following command should cover all the Package Dependencies:.

gstreamer overlay image

If those packages are available, you should be able to simply download the repository, move to the src directory and build. Haven't tried to build on Windows yet. In theory it ought to build, but I don't think I'll take the time to do so. Run as below. The stream URL is currently the only argument. TCP Server port is still hard coded to You can then connect VLC and other media players? To add text overlays to the relayed video stream, 'video-text-realay' runs a simple http server that can pick up JSON RPC messages on currently port This allows JSON messages to control the text overlaid on the relayed stream.

The required code for clients is fairly simple, and cound conceivably be coded in any language, but I'm currently using python. This python script can apply staic non moving text to a specific location x,y in pixels over the relay stream. Simple help is avilable as below:.

An example of some Staic text can be seen below:. When overlaying text on a video stream, the text strings can be decorated with two kinds of markup:. Note that the -s and -b switches above add a drop shadow and shaded underlay to make the text easier to read.


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