`pygame`: on Ubuntu, using `pygame.image.save` to save PNG causes `pygame.error: SavePNG: could not create png write struct`

Question

错误：

  File "/home/alien/cncell/core/animator.py", line 413, in create_animation_from_data
    pygame.image.save(screen, image_fp)
pygame.error: SavePNG: could not create png write struct

可能的提示A：我现在在Ubuntu。运行 Windows.

上的相同脚本时，我没有遇到此问题

可能的提示 B： 当首次调用 pygame.image.save 时，libpng 会产生以下警告：

libpng warning: Application built with libpng-1.2.51 but running with 1.6.17

我应该怎么做才能解决这个问题？

我尝试过的一些事情：

1) 我可以加载 PNG 吗？ 可以

2) python -m pygame.tests的结果：

======================================================================
FAIL: BaseModuleTest.test_get_error
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/base_test.py", line 569, in test_get_error
    e)
AssertionError: Failed to access the SoundFont /usr/share/sounds/sf2/FluidR3_GM.sf2

======================================================================
FAIL: BaseModuleTest.test_set_error
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/base_test.py", line 586, in test_set_error
    e)
AssertionError: Failed to access the SoundFont /usr/share/sounds/sf2/FluidR3_GM.sf2

======================================================================
ERROR: GL_ImageSave.test_image_save_works_with_opengl_surfaces
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image__save_gl_surface_test.py", line 37, in test_image_save_works_with_opengl_surfaces
    pygame.image.save(screen, tmp_file)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageModuleTest.testSavePNG24
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image_test.py", line 215, in testSavePNG24
    pygame.image.save(surf, f_path)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageModuleTest.testSavePNG32
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image_test.py", line 184, in testSavePNG32
    pygame.image.save(surf, f_path)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageModuleTest.test_save
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image_test.py", line 248, in test_save
    pygame.image.save(s, temp_filename)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageModuleTest.test_save_colorkey
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image_test.py", line 275, in test_save_colorkey
    pygame.image.save(s, temp_filename)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageextModuleTest.test_save_unicode_path
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/imageext_test.py", line 65, in test_save_unicode_path
    imageext.save_extended(im, temp_file)
error: SavePNG: could not create png write struct

----------------------------------------------------------------------
Ran 708 tests in 28.894s

FAILED (failures=2, errors=6)

这些测试的结果让我认为这个问题不太可能是由于我的代码从 Windows 移植到 Ubuntu 的特定问题（例如，我试过尽可能修复路径名等，pygame 测试应该独立于平台，但仍然失败？）。

Answer 1

这个问题是因为 I installed my Python stack using Anaconda, but then installed pygame using the build+install instructions for Ubuntu on pygame's documentation page.

我认为，这导致 libpng 的库存在冲突，不知何故。

无论如何，问题已解决：

1) 删除 pygame（因为我使用 pip 安装 pygame 的说明，pip uninstall pygame 成功了）

2) 安装 pygame using a build some kind soul had contributed to the conda repositories

然后，运行 python -m pygame.tests 没有报错，除了：

======================================================================
FAIL: BaseModuleTest.test_get_error
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/base_test.py", line 569, in test_get_error
    e)
AssertionError: Failed to access the SoundFont /usr/share/sounds/sf2/FluidR3_GM.sf2

======================================================================
FAIL: BaseModuleTest.test_set_error
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/base_test.py", line 586, in test_set_error
    e)
AssertionError: Failed to access the SoundFont /usr/share/sounds/sf2/FluidR3_GM.sf2

为了这个问题的目的，我同意。

`pygame`: on Ubuntu, using `pygame.image.save` to save PNG causes `pygame.error: SavePNG: could not create png write struct`

`pygame`: on Ubuntu, using `pygame.image.save` to save PNG causes `pygame.error: SavePNG: could not create png write struct`

python

ubuntu

pygame

libpng