GStreamer Daemon - Javascript Video Player Example

Introduction to GStreamer Daemon Javascript Video Player Example

This is one concrete usage example of the GStreamer Daemon along with a Javascript + HTML Application. In this case, the application uses the Javascript GSTD API to communicate with GStreamer Daemon through the HTTP server.

The application consists of a Simple Video Player with several capabilities:

Select the input (Camera or video file)
Regular and reverse video playback.
Trick modes (fast-forward, speed change, seek to position).
Read messages from the GSTD bus.

Usage

Server side

A regular localhost setup will use just one computer with the following variables. You can also use a local area network to have multiple devices.

GSTD_ADDRESS=127.0.0.1
GSTD_PORT=5000
SERVER_ADDRESS=127.0.0.1
SERVER_PORT=8000

Run gstd

gstd --enable-http-protocol --http-address=${GSTD_ADDRESS} --http-port=${GSTD_PORT}

Then move to web examples and run the server:

cd examples/web/

./setup_http_server.sh -a $SERVER_ADDRESS -p $SERVER_PORT

Client side

On your browser go to:

http://127.0.0.1:8000/  (Use the IP and port that you configured in the last step)

Now you can see the menu with the available examples On this page, you need to configure the IP and Port where GstD is running, in this case, IP=127.0.0.1 and Port=5000.

Example 1: Video player

Now select the first example "Video player" and you can see the following page. It is possible to enter the example without the menu, in that case, it is necessary to configure the Address and port as shown in the picture.

Controls:

Select the input
- Camera: Select the camera that you want to use, e.g. /dev/video0 .
- File: Select the video file that you want to use, e.g. /home/user/videos/video.mp4 .
Create the pipelines
Delete the pipeline
Play, Pause, Stop
Speed
Playback direction ( > Forward, < backward )
Jump to a specific time
The console shows the errors, warnings, and logs of gstd

Example 2: GSTD Controller

Now select the second example "GSTD controller" and you can see the following page It is possible to enter the example without the menu, in that case, it is necessary to configure the Address and port as shown in the picture.

Controls:

Pipeline e.g videotestsrc ! autovideosink
Create the pipelines
Delete the pipeline
Play, Pause, Stop
Speed
Playback direction ( > Forward, < backward )
Jump to a specific time
The console shows the errors, warnings, and logs of gstd

Advanced controls:

Elements selection (Select the element to modify the properties)
Property selection (Select the property that you want to modify)
New value of the selected property
Filter the bus
Send an EOS
Send a Flush Start and Stop

Add your own example

The two previous applications are just two basic examples to demonstrate its capabilities. It is possible to develop new applications that communicate with Gstd through the JavaScript API or the HTTP API.

The project repository contains the source code for these examples. They are built with:

JavaScript to use the Gstd JavaScript API.
VueJS Components for basic layout and functionalities.

For example, the Video Player Applications is made up of the following components:

.
└── video_player_app
    ├── VideoPlayer
    ├── SelectInput
    ├── ElementsControl
    ├── ChangeProperty
    ├── BusConsole
    ├── BusControl
    ├── FooterControl
    └── GstdControl

The VideoPlayer Component implements most of the communication with Gstd. The developer can integrate this component in any other custom application if the requirements are similar.

First, it is necessary to create a new app file copying .e.g "video_player_app.js" and modify this file with the components required, it is necessary to import each component create an instance, and finally add the component to the HTML .e.g "<gstd-control></gstd-control>".

Then it is necessary to modify the main.js file and add the code to include the new app to the project, copy one of the actual codes that include the apps, and modify it to your own app.

The next step is copy .e.g "controller_app.html" and modify only this line, with the id that you use in your new app.

<div id="controller"></div>

Finally, if you want to add the app to the menu go to the menu.html and add a new row with your new app.

<!DOCTYPE html>
<html>

<head>
    <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
    <meta content="utf-8" http-equiv="encoding">
    <title>Gstd HTTP Server Examples</title>

    <link type="text/css" rel="stylesheet" href="https://unpkg.com/bootstrap/dist/css/bootstrap.min.css" />
    <link type="text/css" rel="stylesheet"
    href="https://unpkg.com/bootstrap-vue@latest/dist/bootstrap-vue.css" />

    <!-- Load polyfills to support older browsers -->
    <script src="https://polyfill.io/v3/polyfill.min.js?features=es2015%2CIntersectionObserver"></script>
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss/dist/tailwind.min.css" rel="stylesheet">
    <!-- This is a development version of Vue.js! -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script src="https://unpkg.com/bootstrap-vue@latest/dist/bootstrap-vue.js"></script>
    <script src="https://unpkg.com/bootstrap-vue@latest/dist/bootstrap-vue-icons.min.js"></script>
    <script src="https://rawcdn.githack.com/RidgeRun/gstd-1.x/feature/http-server-script/libgstc/javascript/libgstc.js"></script>

    <script src="main.js" type="module"></script>
</head>

    <div id="video_player"></div>

<body>

</body>

</html>

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