gst-validate-launcher is an application to run unit or integration testsuites providing a set of options and features to help debugging them.

Run the GStreamer unit tests

Running GStreamer unit tests is as simple as doing:

gst-validate-launcher check.gst*

If you only want to run GStreamer core tests:

gst-validate-launcher check.gstreamer*

Or to run unit tests from gst-plugins-base

gst-validate-launcher check.gst-plugins-base

You can also run them inside valgrind with the -vg option or inside gdb with --gdb for example.

Run the GstValidate default testsuite

GstValidate comes with a default testsuite to be executed on a default set of media samples. Those media samples are stored with git-lfs so you will need it to be able to launch the default testsuite.

Then you can run:

gst-validate-launcher validate

This will only launch the GstValidate tests and not other applications that might be supported (currently ges-launch is also supported and has its own default testsuite).

Example of a testsuite implementation

To implement a testsuite, you will have to write some simple python code that defines the tests to be launched by gst-validate-launcher.

In this example, we will assume that you want to write a whole new testsuite based on your own media samples and scenarios. The set of media files and the testsuite implementation file will be structured as follow:

  |-> sample_files/
      |-> file.mp4
      |-> file1.mkv
      |-> file2.ogv
  |-> scenarios
      |-> scenario.scenario
      |-> scenario1.scenario

You should generate the .media_info files. To generate them for local files, you can use:

gst-validate-launcher --medias-paths /path/to/sample_files/ --generate-media-info

For remote streams, you should use gst-validate-media-check-1.0. For an http stream you can for example do:

gst-validate-media-check-GST_API_VERSION \
              --output-file /path/to/testsuite_folder/sample_files/thestream.stream_info

The gst-validate-launcher will use the generated .media_info and .stream_info files to validate the tests as those contain the necessary information.

Then you will need to write the file. You can for example implement the following testsuite:

The GstValidate custom testsuite

import os
from launcher.baseclasses import MediaFormatCombination
from launcher.apps.gstvalidate import *
TEST_MANAGER = "validate"


def setup_tests(test_manager, options):
    print("Setting up the custom testsuite")
    assets_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), ".", "samples_files"))

    # This step will register default data for the test manager:
    # - scenarios such as `play_15s`, `reverse_playback` etc.
    # - encoding formats such as "mp4,h264,mp3" etc.
    # - blacklist such as dash.media_check.*
    # - test generators:
    #   - GstValidatePlaybinTestsGenerator
    #   - GstValidateMediaCheckTestsGenerator
    #   - GstValidateTranscodingTestsGenerator
    # This 'defaults' can be found in 'gst-devtools/validate/launcher/apps/'
    # test_manager.register_defaults()

    # Add scenarios
    scenarios = []

    # Add encoding formats used by the transcoding generator
            MediaFormatCombination("mp4", "mp3", "h264"),])

    # Add generators
    # GstValidatePlaybinTestsGenerator needs at least one media file
    # GstValidatePlaybinTestsGenerator needs at least one scenario
    # GstValidateTranscodingTestsGenerator needs at least one MediaFormatCombination

    # list of combo to blacklist tests. Here it blacklists all tests with playback.seek_backward
             "Not supported by this testsuite."),])

    # you can even pass known issues to bypass an existing error in your custom testsuite
    return True

Once this is done, you've got a testsuite that will:

  • Run playbin pipelines on file.mp4, file1.mkv and file2.ogv> executing play_15s and seek_backward scenarios

  • Transcode file.mp4, file1.mkv and file2.ogv to h264 and mp3 in a MP4 container

The only thing to do to run the testsuite is:

gst-validate-launcher --testsuites-dir=/path/to/testsuite_folder/ testsuite


You can find detailed information about the launcher by launching it:

gst-validate-launcher --help

You can list all the tests with:

gst-validate-launcher --testsuites-dir=/path/to/testsuite_folder/ testsuite -L

The results of the search are