[BUG] Segmentation fault when presenting slides

[pacaunt]

Description

I run the basic example file with the command including manim and

manim-slides BasicExample

but then the interface crashed and the following error appeared:

QOpenGLFunctions created with non-current context
[1]    9459 segmentation fault (core dumped)  manim-slides BasicExample

I use python 3.12.3 in a virtual environment on Ubuntu 24.04.

Version

5.1.7

Platform

Ubuntu 24.04 linux

Screenshots

No response

Additional information

No response

[jeertmans]

Hello! This is the first time I encounter this issue, so I do not know yet the solution.

Are you running the command inside a Docker environment or WSL?

Can you include the output of pip freeze here?

[pacaunt]

Hello! This is the first time I encounter this issue, so I do not know yet the solution.

Are you running the command inside a Docker environment or WSL?

Can you include the output of pip freeze here?

There is no output from that command...

[jeertmans]

Hello! This is the first time I encounter this issue, so I do not know yet the solution.
Are you running the command inside a Docker environment or WSL?
Can you include the output of pip freeze here?

There is no output from that command...

Very bizarre, can you put a screenshot of you writing that in the terminal and the output here?

[pacaunt]

I run the Ubuntu by itself, not in WSL.

[jeertmans]

I run the Ubuntu by itself, not in WSL.

I meant a screenshot of the pip freeze command :)

[pacaunt]

There's really nothing... ToT

[jeertmans]

Does not make any sense to me… Is pip working with other subcommands?

[bswck]

I reproduced this with the following virtual environment:

annotated-types==0.7.0
av==12.2.0
certifi==2024.7.4
charset-normalizer==3.3.2
click==8.1.7
click-default-group==1.2.4
cloup==3.0.5
decorator==5.1.1
glcontext==2.5.0
idna==3.7
isosurfaces==0.1.2
jinja2==3.1.4
lxml==5.2.2
manim==0.18.1
manim-slides==5.1.7
manimpango==0.5.0
mapbox-earcut==1.0.1
markdown-it-py==3.0.0
markupsafe==2.1.5
mdurl==0.1.2
moderngl==5.10.0
moderngl-window==2.4.6
multipledispatch==1.0.0
networkx==3.3
numpy==1.26.4
packaging==24.1
pillow==10.4.0
pycairo==1.26.1
pydantic==2.8.2
pydantic-core==2.20.1
pydantic-extra-types==2.9.0
pydub==0.25.1
pyglet==2.0.15
pygments==2.18.0
pyrr==0.10.3
pyside6==6.7.2
pyside6-addons==6.7.2
pyside6-essentials==6.7.2
python-pptx==0.6.23
qtpy==2.4.1
requests==2.32.3
rich==13.7.1
rtoml==0.11.0
scipy==1.14.0
screeninfo==0.8.1
shiboken6==6.7.2
skia-pathops==0.8.0.post1
srt==3.5.3
svgelements==1.9.6
tqdm==4.66.4
typing-extensions==4.12.2
urllib3==2.2.2
watchdog==4.0.1
xlsxwriter==3.2.0

Note

Before the Python venv installation, I ran
sudo apt install -y build-essential libcairo2-dev libpango1.0-dev ffmpeg
which effectively installed

build-essential		12.10ubuntu1
libcairo2-dev		1.18.0-3build1
libpango1.0-dev		1.52.1+ds-1build1
ffmpeg			6.1.1-3ubuntu5+esm1

This is the output I got when compiling the example:

❯ manim-slides BasicExample
[AVHWDeviceContext @ 0x3a34f00] libva: /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so init failed
[AVHWDeviceContext @ 0x3a37340] libva: /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so init failed
QOpenGLFunctions created with non-current context
Segmentation fault (core dumped)

I'm running Python 3.12.3 (main, Apr 15 2024, 18:25:56) [Clang 17.0.6 ] on Linux-6.8.0-31-generic-x86_64-with-glibc2.39.

[bswck]

Downgrading to pyside6==6.5.2 fixed the issue. CC @pacaunt
@jeertmans maybe make an extra with pyside6 pinned to 6.5.2?

[jeertmans]

Hello @bswck, thanks for the update! However, PySide6 is not available on Python 3.12, at least not if installed via Pip, see the Python requires. What version are you using?

[jeertmans]

Closing as no responses from author, feel free to re-open if you think this is still an issue.

[FloezeTv]

Hey @jeertmans,

I think I am experiencing the same issue that is already identified in this thread.

When I run manim-slides BasicExample, the GUI starts, but is frozen, and then crashes with a segmentation-fault:

$ manim-slides BasicExample
[h264 @ 0x563c0a901fc0] Failed to allocate a vaapi/nv12 frame from a fixed pool of hardware frames.
[h264 @ 0x563c0a901fc0] Consider setting extra_hw_frames to a larger value (currently set to -1, giving a pool size of 36).
[h264 @ 0x563c0a901fc0] get_buffer() failed
[h264 @ 0x563c0a901fc0] thread_get_buffer() failed
[h264 @ 0x563c0a901fc0] decode_slice_header error
[h264 @ 0x563c0a901fc0] no frame!
QOpenGLFunctions created with non-current context
zsh: segmentation fault (core dumped)  manim-slides BasicExample

The part about failing to allocate a vaapi/nv12 frame does not always appear (on my CachyOS machine it did not appear at all):

$ manim-slides BasicExample
QOpenGLFunctions created with non-current context
zsh: segmentation fault (core dumped)  manim-slides BasicExample

It did not matter, whether I installed using pipx or in a python venv and whether I selected pyside6-full or pyqt6-full.

pip freeze

annotated-types==0.7.0
asttokens==2.4.1
av==13.1.0
certifi==2024.8.30
charset-normalizer==3.4.0
click==8.1.7
click-default-group==1.2.4
cloup==3.0.5
decorator==5.1.1
docutils==0.21.2
executing==2.1.0
glcontext==3.0.0
idna==3.10
ipython==8.29.0
isosurfaces==0.1.2
jedi==0.19.1
Jinja2==3.1.4
lxml==5.3.0
manim==0.18.1
manim-slides==5.1.9
ManimPango==0.6.0
mapbox_earcut==1.0.2
markdown-it-py==3.0.0
MarkupSafe==3.0.2
matplotlib-inline==0.1.7
mdurl==0.1.2
moderngl==5.12.0
moderngl-window==2.4.6
multipledispatch==1.0.0
networkx==3.4.2
numpy==1.26.4
packaging==24.1
parso==0.8.4
pexpect==4.9.0
pillow==11.0.0
prompt_toolkit==3.0.48
ptyprocess==0.7.0
pure_eval==0.2.3
pycairo==1.27.0
pydantic==2.9.2
pydantic-extra-types==2.9.0
pydantic_core==2.23.4
pydub==0.25.1
pyglet==2.0.18
Pygments==2.18.0
pyrr==0.10.3
PySide6==6.8.0.2
PySide6_Addons==6.8.0.2
PySide6_Essentials==6.8.0.2
python-pptx==1.0.2
QtPy==2.4.1
requests==2.32.3
rich==13.9.3
rtoml==0.11.0
scipy==1.14.1
screeninfo==0.8.1
shiboken6==6.8.0.2
six==1.16.0
skia-pathops==0.8.0.post2
srt==3.5.3
stack-data==0.6.3
svgelements==1.9.6
tqdm==4.66.6
traitlets==5.14.3
typing_extensions==4.12.2
urllib3==2.2.3
watchdog==5.0.3
wcwidth==0.2.13
XlsxWriter==3.2.0

I followed the example from the Quickstart and can reproduce this error on both Manjaro with Python 3.12.6 and CachyOS with Python 3.12.7.

[jeertmans]

Hi @FloezeTv, thanks for reporting! I will re-open.

Can you test if the issue persists PyQT6 instead of PySide6? And with version 6.7.*?

[FloezeTv]

Yes, the issue occurs with both pyqt6 (installing manim-slides using pyqt6-full) as well as with older versions of pyside6 (I've tested 6.7.3, 6.7.0, 6.6.3.1, and 6.6.0).

[jeertmans]

Downgrading to pyside6==6.5.2 fixed the issue. CC @pacaunt @jeertmans maybe make an extra with pyside6 pinned to 6.5.2?

@FloezeTv and what about version 6.5.2?

Yes, the issue occurs with both pyqt6 (installing manim-slides using pyqt6-full) as well as with older versions of pyside6 (I've tested 6.7.3, 6.7.0, 6.6.3.1, and 6.6.0).

Thanks for testing!

EDIT: I just noticed that you use Python3.12, so version 6.5.2 might not be available...

[FloezeTv]

I downgraded python to 3.11.9 and manim-slides works with pyside6==6.5.2.
pyside6==6.5.3 is broken again, however:

qt.multimedia.ffmpeg.libsymbolsresolver: Couldn't load OpenSsl library
    failed to get textures for frame; format: 44 textureConverter null
QOpenGLFunctions created with non-current context
zsh: segmentation fault (core dumped)  manim-slides BasicExample

[jeertmans]

Do you have libva installed? https://github.com/intel/libva

See relevant thread: https://forum.qt.io/topic/150877/qt-multimedia-warnings-qt-6-6-0/8

[FloezeTv]

Yes, libva is installed.
I also found that thread when searching for that error.
I did not get the Couldn't load VAAPI library-message, so I think libva should be working properly.
The line about OpenSSL is because I have OpenSSL 3 installed and QT looks for OpenSSL 1.1 I think (as is also written in that thread).

[jeertmans]

I downgraded python to 3.11.9 and manim-slides works with pyside6==6.5.2. pyside6==6.5.3 is broken again, however:

qt.multimedia.ffmpeg.libsymbolsresolver: Couldn't load OpenSsl library
    failed to get textures for frame; format: 44 textureConverter null
QOpenGLFunctions created with non-current context
zsh: segmentation fault (core dumped)  manim-slides BasicExample

If I remember correctly, 6.5.3 introduced some bugs. Does 6.6 and 6.7 versions work on Python 3.11?