Unable to run slide presentation of BasicExample

[mocalvao]

Hi,
I have a Kubuntu Linux 24.04 desktop machine, in which I suceeded installing manim (CE), via a virtual environment under pixi. I have been able to create several manimations this way.
Now I have tried to use manim-slides. To that end, I have been able to install it as well as pyqt under my pixi virtual environment.
Afterwards, I was able to run the command, apparently without any issues:

manim example.py BasicExample

and directories called media and slides were indeed created. However, when I tried to run the presentation, via:

manim-slides BasicExample

the following traceback ocurred:

Traceback (most recent call last):
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/bin/manim-slides", line 10, in <module>
    sys.exit(cli())
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.10/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.10/site-packages/click/core.py", line 1082, in main
    rv = self.invoke(ctx)
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.10/site-packages/click/core.py", line 1697, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.10/site-packages/click/core.py", line 1443, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.10/site-packages/click/core.py", line 788, in invoke
    return __callback(*args, **kwargs)
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.10/site-packages/manim_slides/present/__init__.py", line 344, in present
    player = Player(
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.10/site-packages/manim_slides/present/player.py", line 229, in __init__
    self.video_sink = self.video_widget.videoSink()
AttributeError: 'QVideoWidget' object has no attribute 'videoSink'

Could you provide me any help?
Thanks

[jeertmans]

Hi, could you provide the output of manim-slides checkhealth?

[mocalvao]

Manim Slides version: 5.4.2
Python executable: /home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/bin/python3.10
Manim bindings:
manim (version: 0.19.0)
manimgl not found
Qt API: pyqt5 (version: 5.15.8)

[jeertmans]

How did you install Manim Slides? Because Manim Slides requires PyQt6 or PySide6, which can be installed with pip install "manim-slides[pyside6]" or pip install "manim-slides[pyqt6]".

[jeertmans]

If you did not specify those extras, I will not install the required Qt bindings, hence the bug.

[mocalvao]

I will try then to reinstall things from scratch and report back.

[mocalvao]

I have reinstalled, always via my virtual environment using pixi:

• python 3.12, from conda forge
• manim 0.19.0, from conda forge
• pyside6 6.8.2, from PyPI
• manim-slides 5.4.2, from PyPI
• other pyside additional packages, just in case
  This is confirmed by my pixi.toml file:

[project]
authors = ["Mauricio Calvao <[email protected]>"]
channels = ["conda-forge"]
name = "manimations"
platforms = ["linux-64"]
version = "0.1.0"

[tasks]

[dependencies]
python = "3.12.*"
manim = ">=0.19.0,<0.20"

[pypi-dependencies]
manim-slides = ">=5.4.2, <6"
pyside6-essentials = ">=6.8.2, <7"
pyside6-addons = ">=6.8.2, <7"
pyside6 = "*"

If I issue the command manim-slides checkhealth, it reads:

Manim Slides version: 5.4.2
Python executable: /home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/bin/python3.12
Manim bindings:
        manim (version: 0.19.0)
        manimgl not found
Qt API: pyside6 (version: 6.8.2)

However now, after running first manim, with no issues at all, and then manim-slides, on the example.py from the repo, the following traceback pops up:

Traceback (most recent call last):
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/bin/manim-slides", line 10, in <module>
    sys.exit(cli())
             ^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 1082, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 1697, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 1443, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 788, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/manim_slides/present/__init__.py", line 300, in present
    from .player import Player
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/manim_slides/present/player.py", line 7, in <module>
    from qtpy.QtMultimedia import QAudioOutput, QMediaPlayer, QVideoFrame
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/qtpy/QtMultimedia.py", line 19, in <module>
    from PySide6.QtMultimedia import *
ImportError: libQt6Multimedia.so.6: cannot open shared object file: No such file or directory

I installed the deb packages qt-6-base-dev and qt6-base-dev-tools, but the error above persisted...

[jeertmans]

I am not familiar to pixi, but you could (and should) simplify the config file to something like:

[project]
authors = ["Mauricio Calvao <[email protected]>"]
channels = ["conda-forge"]
name = "manimations"
platforms = ["linux-64"]
version = "0.1.0"

[dependencies]
python = "3.12.*"

[pypi-dependencies]
manim-slides = { version = ">=5.4.2", extras = ["pyside6-full"]}

Also, don't use conda channels, it is not required and is likely to cause more trouble than anything. If pixi is built for Anaconda users, then I recommend using something else, like uv, which supports standard pyproject.toml files for configuration.

[mocalvao]

I tried your above suggestion of a simplified pixi.toml file and it did work! Thank you very much!!

[jeertmans]

Happy it helped :)

[mocalvao]

I have also installed the deb packages libqt6multimedia6, libqt6multimediaquick6 and libqt6multimediawidgets6, and now the traceback,, after manim-slides BasicExample is:

Traceback (most recent call last):
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/bin/manim-slides", line 10, in <module>
    sys.exit(cli())
             ^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 1082, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 1697, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 1443, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/click/core.py", line 788, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/manim_slides/present/__init__.py", line 300, in present
    from .player import Player
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/manim_slides/present/player.py", line 7, in <module>
    from qtpy.QtMultimedia import QAudioOutput, QMediaPlayer, QVideoFrame
  File "/home/orca/Dropbox/work/study/computing/pixi/manimations/.pixi/envs/default/lib/python3.12/site-packages/qtpy/QtMultimedia.py", line 19, in <module>
    from PySide6.QtMultimedia import *
ImportError: /lib/x86_64-linux-gnu/libQt6Multimedia.so.6: undefined symbol: _ZN4QRhi9newBufferEN10QRhiBuffer4TypeE6QFlagsINS0_9UsageFlagEEi, version Qt_6_PRIVATE_API

At least the error changed :-(