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[scene caching] partial movie file not found

See original GitHub issue

Here is another scene caching error: running the code

from manim import *


class TestZoom1(ZoomedScene):
        CONFIG = {
            "zoomed_camera_frame_starting_position": [0, 0, 0],
            "zoomed_display_corner": [0, 0, 0],
            "zoomed_display_height": config['frame_height'],
            "zoomed_display_width": config['frame_width'],
            "zoom_factor": 0.1,
        }
        def construct(self):
            self.activate_zooming(animate=True)
            d = Dot()
            self.add(d)

(one of our examples from the documentation) twice raises the following error:

[behackl@atreus playground]$ manim test.py TestZoom1 -m
[09/23/20 14:38:04] INFO     Animation 0 : Partial movie file written in {'/home/behackl/Dokumente/git/etc/manim/playground/media/videos/test/720p30/partial_movie_files/TestZoom1/2818502609_1974117047_3316235269.mp4'}                       scene_file_writer.py:463
[09/23/20 14:38:05] INFO     Animation 1 : Partial movie file written in {'/home/behackl/Dokumente/git/etc/manim/playground/media/videos/test/720p30/partial_movie_files/TestZoom1/1160423895_881011468_1267139589.mp4'}                        scene_file_writer.py:463
                    INFO                                                                                                                                                                                                                        scene_file_writer.py:635
                             File ready at /home/behackl/Dokumente/git/etc/manim/playground/media/videos/test/720p30/TestZoom1.mp4                                                                                                                                      
                                                                                                                                                                                                                                                                        
                    INFO     Rendered TestZoom1                                                                                                                                                                                                             scene.py:129
                             Played 2 animations                                                                                                                                                                                                                        
[behackl@atreus playground]$ manim test.py TestZoom1 -m
[09/23/20 14:38:07] INFO     Animation 0 : Using cached data (hash : 2818502609_1974117047_3316235269)                                                                                                                                                      scene.py:823
[09/23/20 14:38:08] INFO     Animation 1 : Partial movie file written in {'/home/behackl/Dokumente/git/etc/manim/playground/media/videos/test/720p30/partial_movie_files/TestZoom1/2818502609_1974117047_3316235269.mp4'}                       scene_file_writer.py:463
[concat @ 0x564241a313c0] Impossible to open 'file:/home/behackl/Dokumente/git/etc/manim/playground/media/videos/test/720p30/partial_movie_files/TestZoom1/2796914319_881011468_1267139589.mp4'
/home/behackl/Dokumente/git/etc/manim/playground/media/videos/test/720p30/partial_movie_files/TestZoom1/partial_movie_file_list.txt: No such file or directory
                    INFO                                                                                                                                                                                                                        scene_file_writer.py:635
                             File ready at /home/behackl/Dokumente/git/etc/manim/playground/media/videos/test/720p30/TestZoom1.mp4                                                                                                                                      
                                                                                                                                                                                                                                                                        



Traceback (most recent call last):
  File "/home/behackl/Dokumente/git/etc/manim/manim/__main__.py", line 170, in main
    scene = SceneClass()
  File "/home/behackl/Dokumente/git/etc/manim/manim/scene/scene.py", line 93, in __init__
    self.file_writer.finish()
  File "/home/behackl/Dokumente/git/etc/manim/manim/scene/scene_file_writer.py", line 387, in finish
    self.combine_movie_files()
  File "/home/behackl/Dokumente/git/etc/manim/manim/scene/scene_file_writer.py", line 592, in combine_movie_files
    modify_atime(file_path)
  File "/home/behackl/Dokumente/git/etc/manim/manim/utils/file_ops.py", line 53, in modify_atime
    os.utime(file_path, times=(time.time(), os.path.getmtime(file_path)))
  File "/usr/lib/python3.8/genericpath.py", line 55, in getmtime
    return os.stat(filename).st_mtime
FileNotFoundError: [Errno 2] No such file or directory: '/home/behackl/Dokumente/git/etc/manim/playground/media/videos/test/720p30/partial_movie_files/TestZoom1/2796914319_881011468_1267139589.mp4'

(I’ve noticed this from running make html && make clean && make html from docs.)