Don't write to file by default

Author: eulertour

manim/_config/utils.py

@@ -707,6 +707,11 @@ def digest_args(self, args: argparse.Namespace) -> "ManimConfig":
         if args.tex_template:
             self.tex_template = TexTemplateFromFile(tex_filename=args.tex_template)
 
+        if self.use_opengl_renderer:
+            if getattr(args, "write_to_movie") is None:
+                # --write_to_movie was not passed on the command line, so don't generate video.
+                self["write_to_movie"] = False
+
         return self
 
     def digest_file(self, filename: str) -> "ManimConfig":

manim/renderer/opengl_renderer.py

@@ -382,7 +382,9 @@ def update_frame():
 
         window_background_color = (0.2, 0.2, 0.2, 1)
         update_frame()
-        self.file_writer.write_frame(self)
+
+        if config["write_to_movie"]:
+            self.file_writer.write_frame(self)
 
         if self.window is not None:
             self.window.swap_buffers()