[BUG] cannot concatenate video files with manim-slides utils

[luccpaiva]

Terms

• Checked the existing issues and discussions to see if my issue had not already been reported;
• Checked the [frequently asked questions]](https://manim-slides.eertmans.be/latest/faq.html);
• Read the installation instructions;
• Created a virtual environment in which I can reproduce my bug;

Describe the issue

I can run the manim command and generate the video without errors, but manim-slides fails at generating the necessary files (like the .json needed for running the presentation).

I have tried older versions of manim-slides (until far back 5.1) and also with manim-lib. The error is the same across all tests

Command

manim-slides render example.py BasicExample

Issue Type

Installation issue

Python version

Python 3.12.0

Python environment

❯ manim-slides checkhealth
Manim Slides version: 5.1.9
Python executable: D:\OneDrive\Documents\PhD\Seminario\venv\Scripts\python.exe
Manim bindings:
        manim (version: 0.18.1)
        manimgl not found
No Qt API found, some Manim Slides commands will not be available

What is your platform?

Windows

Other platform

No response

Manim Slides Python code

from manim import *  # or: from manimlib import *

from manim_slides import Slide


class BasicExample(Slide):
    def construct(self):
        circle = Circle(radius=3, color=BLUE)
        dot = Dot()

        self.play(GrowFromCenter(circle))
        self.next_slide()  # Waits user to press continue to go to the next slide

        self.next_slide(loop=True)  # Start loop
        self.play(MoveAlongPath(dot, circle), run_time=2, rate_func=linear)
        self.next_slide()  # This will start a new non-looping slide

        self.play(dot.animate.move_to(ORIGIN))

Relevant log output

❯ manim-slides render example.py BasicExample                                                          
Manim Community v0.18.1

[12/02/24 18:10:15] INFO     Animation 0 : Using cached data (hash : 3977891868_1210654341_223132457)                                   cairo_renderer.py:88
                    INFO     Animation 1 : Using cached data (hash : 2852726489_3931823519_1829105458)                                  cairo_renderer.py:88
                    INFO     Animation 2 : Using cached data (hash : 2852726489_3368153825_3481576351)                                  cairo_renderer.py:88
                    INFO     Combining to Movie file.                                                                               scene_file_writer.py:617
                    INFO                                                                                                            scene_file_writer.py:737
                             File ready at 'D:\OneDrive\Documents\PhD\Seminario\media\videos\example\1080p60\BasicExample.mp4'      

                    INFO     Rendered BasicExample                                                                                              scene.py:247
                             Played 3 animations
Concatenating animation files to 'slides\files\BasicExample' and generating reversed animations:   0%|                               | 0/3 [00:00<?, ?it/s][12/02/24 18:10:15] WARNING  Processing video file                                                                                               utils.py:18
                             D:\OneDrive\Documents\PhD\Seminario\media\videos\example\1080p60\partial_movie_files\BasicExample\3977891868_121065 
                             4341_223132457.mp4
                    WARNING  Concatenating video files into                                                                                      utils.py:38
                             slides\files\BasicExample\83994b92f34023744dac3501adea8b80fbf32a8ea0841b11b086e80afd053578.mp4
                    WARNING  Temporary file: C:\Users\lucas\AppData\Local\Temp\tmpva_ssmya.txt                                                   utils.py:39
                    WARNING  Input video stream: <av.VideoStream #0 h264, yuv420p 1920x1080 at 0x1dd8f9fb2e0>                                    utils.py:41
╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ D:\OneDrive\Documents\PhD\Seminario\venv\Lib\site-packages\manim\cli\render\commands.py:120 in   │
│ render                                                                                           │
│                                                                                                  │
│   117 │   │   │   try:                                                                           │
│   118 │   │   │   │   with tempconfig({}):                                                       │
│   119 │   │   │   │   │   scene = SceneClass()                                                   │
│ ❱ 120 │   │   │   │   │   scene.render()                                                         │
│   121 │   │   │   except Exception:                                                              │
│   122 │   │   │   │   error_console.print_exception()                                            │
│   123 │   │   │   │   sys.exit(1)                                                                │
│                                                                                                  │
│ D:\OneDrive\Documents\PhD\Seminario\venv\Lib\site-packages\manim_slides\slide\manim.py:136 in    │
│ render                                                                                           │
│                                                                                                  │
│   133 │   │                                                                                      │
│   134 │   │   config["max_files_cached"] = max_files_cached                                      │
│   135 │   │                                                                                      │
│ ❱ 136 │   │   self._save_slides(                                                                 │
│   137 │   │   │   use_cache=not (config["disable_caching"] or self.disable_caching),             │
│   138 │   │   │   flush_cache=(config["flush_cache"] or self.flush_cache),                       │
│   139 │   │   │   skip_reversing=self.skip_reversing,                                            │
│                                                                                                  │
│ D:\OneDrive\Documents\PhD\Seminario\venv\Lib\site-packages\manim_slides\slide\base.py:532 in     │
│ _save_slides                                                                                     │
│                                                                                                  │
│   529 │   │   │                                                                                  │
│   530 │   │   │   # We only concat animations if it was not present                              │
│   531 │   │   │   if not use_cache or not dst_file.exists():                                     │
│ ❱ 532 │   │   │   │   concatenate_video_files(slide_files, dst_file)                             │
│   533 │   │   │                                                                                  │
│   534 │   │   │   # We only reverse video if it was not present                                  │
│   535 │   │   │   if not use_cache or not rev_file.exists():                                     │
│                                                                                                  │
│ D:\OneDrive\Documents\PhD\Seminario\venv\Lib\site-packages\manim_slides\utils.py:42 in           │
│ concatenate_video_files                                                                          │
│                                                                                                  │
│    39 │   │   logger.warning(f"Temporary file: {tmp_file}")                                      │
│    40 │   │   input_video_stream = input_container.streams.video[0]                              │
│    41 │   │   logger.warning(f"Input video stream: {input_video_stream}")                        │
│ ❱  42 │   │   output_video_stream = output_container.add_stream(                                 │
│    43 │   │   │   template=input_video_stream,                                                   │
│    44 │   │   )                                                                                  │
│    45                                                                                            │
│                                                                                                  │
│ in av.container.output.OutputContainer.add_stream:47                                             │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
TypeError: add_stream() takes at least 1 positional argument (0 given)

Screenshots

No response

Additional information

❯ pip freeze
annotated-types==0.7.0
av==14.0.0
certifi==2024.8.30
charset-normalizer==3.4.0
click==8.1.7
click-default-group==1.2.4
cloup==3.0.5
colorama==0.4.6
decorator==5.1.1
glcontext==3.0.0
idna==3.10
isosurfaces==0.1.2
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
mdurl==0.1.2
moderngl==5.12.0
moderngl-window==3.0.2
networkx==3.4.2
numpy==2.1.3
packaging==24.2
pillow==11.0.0
pycairo==1.27.0
pydantic==2.10.2
pydantic-extra-types==2.10.0
pydantic_core==2.27.1
pydub==0.25.1
pyglet==2.0.18
PyGLM==2.7.3
Pygments==2.18.0
python-pptx==1.0.2
QtPy==2.4.2
requests==2.32.3
rich==13.9.4
rtoml==0.11.0
scipy==1.14.1
screeninfo==0.8.1
skia-pathops==0.8.0.post2
srt==3.5.3
svgelements==1.9.6
tqdm==4.67.1
typing_extensions==4.12.2
urllib3==2.2.3
watchdog==6.0.0
XlsxWriter==3.2.0

Folder tree:
|-- [Dir] pycache
|-- [Dir] media
|-- [Dir] slides
|-- [File] example.py
|-- [Dir] images
|-- [Dir] videos
|-- [Dir] example
|-- [Dir] example
|-- [Dir] 1080p60
|-- [Dir] partial_movie_files
|-- [File] BasicExample.mp4
|-- [Dir] BasicExample
|-- [File] 2852726489_2902030821_3481576351.mp4
|-- [File] 2852726489_3368153825_3481576351.mp4
|-- [File] 2852726489_3931823519_1829105458.mp4
|-- [File] 3977891868_1210654341_223132457.mp4
|-- [File] partial_movie_file_list.txt
|-- [File] uncached_00000.mp4
|-- [Dir] files
|-- [Dir] BasicExample
|-- [File] example.cpython-312.pyc

Recommended fix or suggestions

No response

[jeertmans]

Hi @luccpaiva, thank you for reporting this bug! It looks like PyAV just released v14, which contains undocumented breaking changes.

I will see when I can fix those. In the meantime, can you try installing av<14 ?

[jeertmans]

Tomorrow, I will release a patch version tomorrow that blocks PyAV 14.

[luccpaiva]

Dear @jeertmans, it does run with an older version of PyAV (i.e. 13.1.0).

However, I now have a different issue, black screen. I will check for related issues and reach back to you.

[luccpaiva]

okay this: #401 (comment) worked (PySide instead of PyQt).

Thank you for the quick reply, I have a presentation next week and I'd really like to use manim-slides, I guess now it's possible!

[jeertmans]

Nice, happy it solved your issue :D !