Add gst-libav dependency to documentation and files

[xela-95]

I had the same problem described in #56 but for Ubuntu 24.04 LTS, i.e. the robot-log-visualizer does not display videos on my conda environment.

I opened the issue since it's for a different version of Ubuntu. I will try to solve this with the advices given in #56 .

The logs produced are the following:

Details

You can open the visualizer by visiting the following URL:
http://127.0.0.1:7001/static/
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
/home/acroci/mambaforge/envs/ironcub/lib/python3.12/site-packages/robot_log_visualizer/plotter/matplotlib_viewer_canvas.py:47: UserWarning: frames=None which we can infer the length of, did not pass an explicit *save_count* and passed cache_frame_data=True.  To avoid a possibly unbounded cache, frame data caching has been disabled. To suppress this warning either pass `cache_frame_data=False` or `save_count=MAX_FRAMES`.
  self.vertical_line_anim = animation.FuncAnimation(
GStreamer; Unable to pause - "file:///home/acroci/Downloads/Ex_2024_11_14/robot_logger_device_2024_11_14_16_23_03_logitech2_rgb.mp4"
GStreamer; Unable to pause - "file:///home/acroci/Downloads/Ex_2024_11_14/robot_logger_device_2024_11_14_16_23_03_logitech_rgb.mp4"
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
Warning: "No decoder available for type 'video/quicktime, variant=(string)iso'."
Warning: "No decoder available for type 'video/quicktime, variant=(string)iso'."
Error: "Your GStreamer installation is missing a plug-in."
Error: "Your GStreamer installation is missing a plug-in."
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material
js: _meshfile is deprecated. Please use _meshfile_geometry for geometries and _meshfile_object for objects with geometry and material

System info

Output of https://github.com/ami-iit/log-installed-software: installed_software.txt

Output of GST_DEBUG=4 gst-play-1.0 '/home/acroci/Downloads/Ex_2024_11_14/robot_logger_device_2024_11_14_16_16_05_logitech_rgb.mp4' : log.txt

[GiulioRomualdi]

This problem happened again today in a fresh unbuntu installation

[isorrentino]

Here the output of this command:

GST_DEBUG=4 gst-play-1.0 robot_logger_device_2026_02_24_12_42_04_realsense_rgb.mp4

log.txt

[traversaro]

The relevant output is:

0:00:00.010452910 �[36m90131�[00m 0x71547c001170 �[36mINFO   �[00m �[00;01;31;47m    GST_ERROR_SYSTEM gstelement.c:2281:gst_element_message_full_with_details:<decodebin3-0>�[00m posting message: Your GStreamer installation is missing a plug-in.
0:00:00.010461407 �[36m90131�[00m 0x71547c001170 �[36mINFO   �[00m �[00;01;31;47m    GST_ERROR_SYSTEM gstelement.c:2308:gst_element_message_full_with_details:<decodebin3-0>�[00m posted error message: Your GStreamer installation is missing a plug-in.
0:00:00.010469843 �[36m90131�[00m 0x71547c001170 �[33;01mWARN   �[00m �[00m          decodebin3 gstdecodebin3.c:3346:mq_slot_check_reconfiguration:<decodebin3-0>�[00m error: No streams to output
0:00:00.010476359 �[36m90131�[00m 0x71547c001170 �[36mINFO   �[00m �[00;01;31;47m    GST_ERROR_SYSTEM gstelement.c:2281:gst_element_message_full_with_details:<decodebin3-0>�[00m posting message: GStreamer encountered a general stream error.
0:00:00.010481133 �[36m90131�[00m 0x71547c001170 �[36mINFO   �[00m �[00;01;31;47m    GST_ERROR_SYSTEM gstelement.c:2308:gst_element_message_full_with_details:<decodebin3-0>�[00m posted error message: GStreamer encountered a general stream error.
ERROR Your GStreamer installation is missing a plug-in. for file:///home/lowerbodyqdd/Desktop/lowerbody_tests/robot_logger_device_2026_02_24_12_42_04_realsense_rgb.mp4
ERROR debug information: ../gst/playback/gstdecodebin3.c(3370): mq_slot_check_reconfiguration (): /GstPlayBin3:playbin/GstURIDecodeBin3:uridecodebin3/GstDecodebin3:decodebin3-0:
No suitable plugins found

Can you report the installed conda packages (i.e. conda list or pixi list)?

[traversaro]

It is possible that you need to install gst-libav package ? See https://chatgpt.com/share/699da3f9-868c-8006-9a76-6d9d776f8ffe and https://github.com/conda-forge/gst-libav-feedstock .

[isorrentino]

conda_list.txt

[traversaro]

Indeed gst-libav is missing, can you try to add it manually?

[isorrentino]

Yes, it worked. Thanks.

[traversaro]

Great, I think then to close we should add gst-libav in:

• robot-log-visualizer/pyproject.toml

  Line 90 in d8e8b09

  gst-plugins-bad = "*"

• https://github.com/search?q=repo%3Arobotology%2Frobotology-superbuild%20gst-plugins-bad&type=code

[isorrentino]

PR for robotology-superbuild robotology/robotology-superbuild#1962
PR for robot-log-visualizer #121