[BUG] No QtMultimedia backends found. Only QMediaDevices, QAudioDevice, QSoundEffect, QAudioSink, and QAudioSource are available.

[837852427]

Please explain the issue you're experiencing (with as much detail as possible):

When I run manim-slides Main I just get this error message

And I got nothing but all black like below:

My pip list are below:

Package                 Version
----------------------- -----------
annotated-types         0.7.0
asttokens               2.4.1
av                      12.1.0
cairocffi               1.7.0
certifi                 2024.2.2
cffi                    1.16.0
charset-normalizer      3.3.2
click                   8.1.7
click-default-group     1.2.4
cloup                   2.1.2
colorama                0.4.6
colorful                0.5.6
colour                  0.1.5
commonmark              0.9.1
contourpy               1.2.1
cyaron                  0.5.0
cycler                  0.12.1
decorator               5.1.1
exceptiongroup          1.2.1
executing               2.0.1
fonttools               4.53.0
glcontext               2.5.0
idna                    3.6
ipython                 8.25.0
isosurfaces             0.1.0
jedi                    0.19.1
Jinja2                  3.1.4
kiwisolver              1.4.5
lxml                    5.2.2
manim                   0.18.0
manim_code_blocks_redux 1.0.14
manim-data-structures   0.1.7
manim-presentation      0.2.1
manim-slides            5.1.7
manim-studio            0.7.4
ManimPango              0.5.0
mapbox-earcut           1.0.1
markdown-it-py          3.0.0
MarkupSafe              2.1.5
matplotlib              3.9.0
matplotlib-inline       0.1.7
mdurl                   0.1.2
moderngl                5.10.0
moderngl-window         2.4.4
mpmath                  1.3.0
multipledispatch        1.0.0
networkx                3.2.1
numpy                   1.26.4
opencv-python           4.10.0.82
packaging               24.0
pangocairocffi          0.4.0
pangocffi               0.8.0
parso                   0.8.4
Pillow                  9.5.0
pip                     24.0
progressbar             2.5
prompt_toolkit          3.0.45
pure-eval               0.2.2
pycairo                 1.26.0
pycparser               2.22
pydantic                2.7.3
pydantic_core           2.18.4
pydantic-extra-types    2.8.0
pydub                   0.25.1
pyglet                  2.0.15
Pygments                2.18.0
PyOpenGL                3.1.7
pyparsing               3.1.2
pyperclip               1.8.2
PyQt6                   6.7.0
PyQt6-Qt6               6.7.1
PyQt6-sip               13.6.0
pyrr                    0.10.3
PySide6                 6.5.2
PySide6-Addons          6.5.2
PySide6-Essentials      6.5.2
python-dateutil         2.9.0.post0
python-pptx             0.6.23
PyYAML                  6.0.1
QtPy                    2.4.1
requests                2.31.0
rich                    13.7.1
rtoml                   0.10.0
scipy                   1.13.1
screeninfo              0.8.1
setuptools              69.5.1
shiboken6               6.5.2
six                     1.16.0
skia-pathops            0.7.4
srt                     3.5.3
stack-data              0.6.3
svgelements             1.9.6
sympy                   1.12.1
tokenize_all_code       1.0.18
tqdm                    4.66.4
traitlets               5.14.3
typing_extensions       4.12.2
urllib3                 2.2.1
validators              0.28.3
watchdog                3.0.0
wcwidth                 0.2.13
xeger                   0.4.0
XlsxWriter              3.2.0

Any comment is welcome, please help me.

[jeertmans]

Hello @837852427, thanks for reporting this issue! Can you please include your Python version?

Also, did you try uninstalling PyQt6 and installing PySide6==6.5.2 instead?

[837852427]

Hello @837852427, thanks for reporting this issue! Can you please include your Python version?

Also, did you try uninstalling PyQt6 and installing PySide6==6.5.2 instead?

Hello @837852427, thanks for reporting this issue! Can you please include your Python version?

Also, did you try uninstalling PyQt6 and installing PySide6==6.5.2 instead?

Below is my python version
Python 3.10.9 (tags/v3.10.9:1dd9be6, Dec 6 2022, 20:01:21) [MSC v.1934 64 bit (AMD64)] on win32
And I just tried manim-slides==5.0.0 and PySide6==6.5.2 it worked! Though it doesnt have the next slide info window but it satisfies my request now.

[jeertmans]

Hello @837852427, thanks for reporting this issue! Can you please include your Python version?
Also, did you try uninstalling PyQt6 and installing PySide6==6.5.2 instead?

Hello @837852427, thanks for reporting this issue! Can you please include your Python version?
Also, did you try uninstalling PyQt6 and installing PySide6==6.5.2 instead?

Below is my python version Python 3.10.9 (tags/v3.10.9:1dd9be6, Dec 6 2022, 20:01:21) [MSC v.1934 64 bit (AMD64)] on win32 And I just tried manim-slides==5.0.0 and PySide6==6.5.2 it worked! Though it doesnt have the next slide info window but it satisfies my request now.

I'm happy that fixed your problem! I'll keep this open because I have to investigate why PyQt6 stops working.

[rguliev]

Faced the same issue. Switching to manim-slides==5.0.0 and PySide6==6.5.2 helped

manim==0.18.1
manim-slides==5.1.9
PySide6==6.8.0.1
PySide6_Addons==6.8.0.1
PySide6_Essentials==6.8.0.1

[jeertmans]

Faced the same issue. Switching to manim-slides==5.0.0 and PySide6==6.5.2 helped

manim==0.18.1
manim-slides==5.1.9
PySide6==6.8.0.1
PySide6_Addons==6.8.0.1
PySide6_Essentials==6.8.0.1

Does it work with the recent manim-slides>=5.1.8?

[rguliev]

No, I had to switch to 5.0.0

[mcnica89]

Chiming in to say I had the same issue with the QT backend not working (on Mac) and I downgraded to manim-slides==5.0.0 version and now it works.

[jeertmans]

This issue is taking quite some time, and I might need your help @mcnica89 or @rguliev to identify compatible version for QT bindings, especially as you are both using different OSes, both different from mine (Linux).

If you have time, could you:

1. Generate dummy slides (e.g., manim-slides render example.py BasicExample) or download pre-rendered slides;
2. Install uv;
3. Try different versions of PySide6 (or PyQt6) and check which version successfully plays slides:
   uv run --with "manim-slides==5.2" --with "PySide6==x.y.z" python -m manim_slides BasicExample. E.g., you can test PySide6 6.7 with:
   uv run --with "manim-slides==5.2" --with "PySide6==6.7" python -m manim_slides BasicExample, or the equivalent PyQt6 version with:
   uv run --with "manim-slides==5.2" --with "PyQt6==6.7" python -m manim_slides BasicExample.

The above commands will create a new Python environment every time the versions change, so this can quite some time (because it needs to download a different Qt version), but ensure reproducibility.