WIP: reversing videos, etc.

Author: jeertmans

README.md

@@ -3,7 +3,7 @@
 ![PyPI - Downloads](https://img.shields.io/pypi/dm/manim-slides)
 # Manim Slides
 
-Tool for live presentations using either [manim](http://3b1b.github.io/manim/) or [manim-community](https://www.manim.community/).
+Tool for live presentations using either [manim-community](https://www.manim.community/). Currently, support for 3b1b's manim is not planned.
 
 > **_NOTE:_**  This project is a fork of [`manim-presentation`](https://github.com/galatolofederico/manim-presentation). Since the project seemed to be inactive, I decided to create my own fork to deploy new features more rapidly.
 
@@ -124,7 +124,6 @@ Here are a few things that I implemented (or that I'm planning to implement) on
 - [x] Config file path can be manually set
 - [ ] Play animation in reverse [#9](https://github.com/galatolofederico/manim-presentation/issues/9)
 - [x] Handle 3D scenes out of the box
-- [ ] Can work with both community and 3b1b versions (not tested)
 - [ ] Generate docs online
 - [ ] Fix the quality problem on Windows platforms with `fullscreen` flag
 

manim_slides/present.py

@@ -16,6 +16,7 @@
 from .commons import config_path_option
 from .config import Config
 from .defaults import CONFIG_PATH, FOLDER_PATH
+from .slide import reverse_video_path
 
 
 @unique
@@ -41,7 +42,7 @@ class Presentation:
     def __init__(self, config, last_frame_next: bool = False):
         self.last_frame_next = last_frame_next
         self.slides = config["slides"]
-        self.files = config["files"]
+        self.files = [reverse_video_path(path) for path in config["files"]]
 
         self.lastframe = []
 
@@ -79,6 +80,9 @@ def prev(self):
         self.current_slide_i = max(0, self.current_slide_i - 1)
         self.rewind_slide()
 
+    def reserve_slide(self):
+        pass
+
     def rewind_slide(self):
         self.current_animation = self.current_slide["start_animation"]
         self.current_cap.set(cv2.CAP_PROP_POS_FRAMES, 0)
@@ -292,8 +296,28 @@ def quit(self):
         sys.exit()
 
 
+"""
 @click.command()
-@click.argument("scenes", nargs=-1)
+@click.option(
+    "--folder",
+    default=FOLDER_PATH,
+    type=click.Path(exists=True, file_okay=False),
+    help="Set slides folder.",
+)
+"""
+@click.help_option("-h", "--help")
+def list_scenes(folder):
+    scenes = []
+
+    for file in os.listdir(folder):
+        if file.endswith(".json"):
+            scenes.append(os.path.basename(file)[:-4])
+
+    return scenes
+
+
+@click.command()
+@click.option("--scenes", nargs=-1, prompt=True)
 @config_path_option
 @click.option(
     "--folder",
@@ -312,6 +336,20 @@ def quit(self):
 def present(scenes, config_path, folder, start_paused, fullscreen, last_frame_next):
     """Present the different scenes."""
 
+    if len(scenes) == 0:
+        print("ICI")
+        scene_choices = list_scenes(folder)
+
+        scene_choices = dict(enumerate(scene_choices, start=1))
+        choices = [str(i) for i in scene_choices.keys()]
+
+        def value_proc(value: str):
+            raise ValueError("Value:")
+        
+        print(scene_choices)
+        
+        scenes = click.prompt("Choose a scene", value_proc=value_proc)
+        
     presentations = list()
     for scene in scenes:
         config_file = os.path.join(folder, f"{scene}.json")

manim_slides/slide.py

@@ -1,12 +1,31 @@
 import json
 import os
+import platform
 import shutil
+import subprocess
 
-from manim import Scene, ThreeDScene, config
+from manim import Scene, ThreeDScene, config, logger
+from tqdm import tqdm
+
+try:  # For manim<v0.16.0.post0
+    from manim.constants import FFMPEG_BIN as ffmpeg_executable
+except ImportError:
+    ffmpeg_executable = config.ffmpeg_executable
 
 from .defaults import FOLDER_PATH
 
 
+def reverse_video_path(src: str) -> str:
+    file, ext = os.path.splitext(src)
+    return f"{file}_reversed{ext}"
+
+
+def reverse_video_file(src: str, dst: str):
+    command = [config.ffmpeg_executable, "-i", src, "-vf", "reverse", dst]
+    process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    process.communicate()
+
+
 class Slide(Scene):
     def __init__(self, *args, output_folder=FOLDER_PATH, **kwargs):
         super().__init__(*args, **kwargs)
@@ -79,14 +98,31 @@ def render(self, *args, **kwargs):
             os.mkdir(scene_files_folder)
 
         files = list()
-        for src_file in self.renderer.file_writer.partial_movie_files:
+        for src_file in tqdm(
+            self.renderer.file_writer.partial_movie_files,
+            desc=f"Copying animation files to '{scene_files_folder}' and generating reversed animations",
+            leave=config["progress_bar"] == "leave",
+            ascii=True if platform.system() == "Windows" else None,
+            disable=config["progress_bar"] == "none",
+        ):
             dst_file = os.path.join(scene_files_folder, os.path.basename(src_file))
             shutil.copyfile(src_file, dst_file)
+            rev_file = reverse_video_path(dst_file)
+            reverse_video_file(src_file, rev_file)
             files.append(dst_file)
 
-        f = open(os.path.join(self.output_folder, "%s.json" % (scene_name,)), "w")
+        logger.info(
+            f"Copied {len(files)} animations to '{os.path.abspath(scene_files_folder)}' and generated reversed animations"
+        )
+
+        slide_path = os.path.join(self.output_folder, "%s.json" % (scene_name,))
+
+        f = open(slide_path, "w")
         json.dump(dict(slides=self.slides, files=files), f)
         f.close()
+        logger.info(
+            f"Slide '{scene_name}' configuration written in '{os.path.abspath(slide_path)}'"
+        )
 
 
 class ThreeDSlide(Slide, ThreeDScene):

setup.py

@@ -2,9 +2,7 @@
 
 import setuptools
 
-sys.path.append("manim_slides")  # To avoid importing manim, which may not be installed
-
-from __version__ import __version__ as version
+from .__version__ import __version__ as version
 
 if sys.version_info < (3, 7):
     raise RuntimeError("This package requires Python 3.7+")
@@ -31,6 +29,7 @@
     install_requires=[
         "click>=8.0",
         "click-default-group>=1.2",
+        "manim",
         "numpy>=1.19.3",
         "pydantic>=1.9.1",
         "opencv-python>=4.6",