Coverage decreased (-0.2%) to 65.185% when pulling fe917ce on mgaitan:pygame_quit into b0f09c7 on Zulko:master.

I'm running:

clip = VideoFileClip("media/big_buck_bunny_0_30.webm").subclip(0,1)
clip.preview()
time.sleep(10)

with this PR and, after playing the video for a second, it crashes (doesn't sleep for 10 secs):

2018-04-22 18:58:17.403 python[2873:132770] WARNING: nextEventMatchingMask should only be called from the Main Thread! This will throw an exception in the future.
Traceback (most recent call last):
  File "tom_t.py", line 7, in <module>
    clip.preview()
  File "<decorator-gen-102>", line 2, in preview
  File "/Users/tomburrows/Python/moviepy-dev/moviepy/moviepy/decorators.py", line 54, in requires_duration
    return f(clip, *a, **k)
  File "<decorator-gen-101>", line 2, in preview
  File "/Users/tomburrows/Python/moviepy-dev/moviepy/moviepy/decorators.py", line 22, in convert_masks_to_RGB
    return f(clip, *a, **k)
  File "<decorator-gen-100>", line 2, in preview
  File "/Users/tomburrows/Python/moviepy-dev/moviepy/moviepy/decorators.py", line 142, in pygame_quit
    value = f(*a, **k)
  File "/Users/tomburrows/Python/moviepy-dev/moviepy/moviepy/video/io/preview.py", line 135, in preview
    for event in pg.event.get():
pygame.error: video system not initialized

When run on the master branch, after a second of video, the last frame just sits there for 10 seconds, then disappears.

I will check, thanks for test it.

@tburrows13 I've updated the decorator to catch pygame.error . This solves the issue you was seeing and then do the sleep. In the other hand, the same code in master in my computer freeze the preview window. Check the capture

It appears that in the past we've never imported pygame in the test environment, so here its raising an error because its not installed.

Ok, I've removed the tests for now, pygame will require some setting up with SDL on Travis, and I have no idea if that would ever work.

This could be a good idea, but:

• Doesn't solves the problem fixed by Update preview.py, fix issue #575 #1537 of quitting pygame when a key is pressed.
• Catching all whatever pygame error passing it seems to me very risky.
• The code and the testing environment is conflicting a lot with current codebase.

For these reasons, I'm closing this to reduce the future reviewing work. Feel free to update this code and reopen the pull if you think that could be interesting 👍