AVBin fails to load after loading opengl32 on Windows

[GoogleCodeExporter]

What steps will reproduce the problem?
In [2]: import ctypes
In [3]: gl_lib = ctypes.windll.opengl32
In [4]: lib = ctypes.cdll.LoadLibrary('avbin')

Paste in the traceback or error message:
WindowsError                              Traceback (most recent call last)

C:\Windows\system32\<ipython console> in <module>()

C:\Python27\lib\ctypes\__init__.pyc in LoadLibrary(self, name)
    429
    430     def LoadLibrary(self, name):
--> 431         return self._dlltype(name)
    432
    433 cdll = LibraryLoader(CDLL)

C:\Python27\lib\ctypes\__init__.pyc in __init__(self, name, mode, handle, 
use_errno, use_last_error)
    351
    352         if handle is None:
--> 353             self._handle = _dlopen(self._name, mode)
    354         else:
    355             self._handle = handle

WindowsError: [Error 998] Invalid access to memory location

--------------

Python
------------------------------------------------------------------------------
sys.version: 2.7.1 (r271:86832, Feb  7 2011, 11:30:38) [MSC v.1500 32 bit 
(Intel)]
sys.platform: win32
os.getcwd(): C:\Users\t\Desktop\ltv_v0.3.0_python

pyglet
------------------------------------------------------------------------------
pyglet.version: 1.1.4
pyglet.__file__: pyglet\__init__.pyc
pyglet.options['debug_trace_depth'] = 1
pyglet.options['font'] = ('gdiplus', 'win32')
pyglet.options['xsync'] = True
pyglet.options['debug_trace_flush'] = True
pyglet.options['debug_win32'] = False
pyglet.options['debug_gl_trace'] = False
pyglet.options['debug_x11'] = False
pyglet.options['shadow_window'] = True
pyglet.options['debug_font'] = False
pyglet.options['debug_media'] = False
pyglet.options['debug_trace'] = False
pyglet.options['debug_lib'] = False
pyglet.options['graphics_vbo'] = True
pyglet.options['vsync'] = None
pyglet.options['debug_trace_args'] = False
pyglet.options['debug_gl'] = True
pyglet.options['debug_graphics_batch'] = False
pyglet.options['audio'] = ('directsound', 'openal', 'alsa', 'silent')
pyglet.options['debug_texture'] = False
pyglet.options['debug_gl_trace_args'] = False

pyglet.window
------------------------------------------------------------------------------
platform: <pyglet.window.win32.Win32Platform object at 0x0257A950>
display: <pyglet.window.win32.Win32Display object at 0x0257A9F0>
screens[0]: Win32Screen(x=0, y=0, width=1920, height=1200)
config['double_buffer'] = True
config['stereo'] = False
config['buffer_size'] = 32
config['aux_buffers'] = 4
config['sample_buffers'] = 0
config['samples'] = 0
config['red_size'] = 8
config['green_size'] = 8
config['blue_size'] = 8
config['alpha_size'] = 8
config['depth_size'] = 24
config['stencil_size'] = 8
config['accum_red_size'] = 0
config['accum_green_size'] = 0
config['accum_blue_size'] = 0
config['accum_alpha_size'] = 0
context: Win32Context()

pyglet.gl.gl_info
------------------------------------------------------------------------------
gl_info.get_version(): 4.1.10524 Compatibility Profile Context
gl_info.get_vendor(): ATI Technologies Inc.
gl_info.get_renderer(): ATI Radeon HD 5800 Series 
gl_info.get_extensions():
   GL_AMDX_debug_output
   GL_AMDX_vertex_shader_tessellator
   GL_AMD_conservative_depth
   GL_AMD_debug_output
   GL_AMD_depth_clamp_separate
   GL_AMD_draw_buffers_blend
   GL_AMD_name_gen_delete
   GL_AMD_performance_monitor
   GL_AMD_sample_positions
   GL_AMD_seamless_cubemap_per_texture
   GL_AMD_shader_stencil_export
   GL_AMD_shader_trace
   GL_AMD_texture_cube_map_array
   GL_AMD_texture_texture4
   GL_AMD_transform_feedback3_lines_triangles
   GL_AMD_vertex_shader_tessellator
   GL_ARB_ES2_compatibility
   GL_ARB_blend_func_extended
   GL_ARB_color_buffer_float
   GL_ARB_copy_buffer
   GL_ARB_depth_buffer_float
   GL_ARB_depth_clamp
   GL_ARB_depth_texture
   GL_ARB_draw_buffers
   GL_ARB_draw_buffers_blend
   GL_ARB_draw_elements_base_vertex
   GL_ARB_draw_indirect
   GL_ARB_draw_instanced
   GL_ARB_explicit_attrib_location
   GL_ARB_fragment_coord_conventions
   GL_ARB_fragment_program
   GL_ARB_fragment_program_shadow
   GL_ARB_fragment_shader
   GL_ARB_framebuffer_object
   GL_ARB_framebuffer_sRGB
   GL_ARB_geometry_shader4
   GL_ARB_get_program_binary
   GL_ARB_gpu_shader5
   GL_ARB_gpu_shader_fp64
   GL_ARB_half_float_pixel
   GL_ARB_half_float_vertex
   GL_ARB_imaging
   GL_ARB_instanced_arrays
   GL_ARB_map_buffer_range
   GL_ARB_multisample
   GL_ARB_multitexture
   GL_ARB_occlusion_query
   GL_ARB_occlusion_query2
   GL_ARB_pixel_buffer_object
   GL_ARB_point_parameters
   GL_ARB_point_sprite
   GL_ARB_provoking_vertex
   GL_ARB_sample_shading
   GL_ARB_sampler_objects
   GL_ARB_seamless_cube_map
   GL_ARB_separate_shader_objects
   GL_ARB_shader_bit_encoding
   GL_ARB_shader_objects
   GL_ARB_shader_precision
   GL_ARB_shader_stencil_export
   GL_ARB_shader_subroutine
   GL_ARB_shader_texture_lod
   GL_ARB_shading_language_100
   GL_ARB_shadow
   GL_ARB_shadow_ambient
   GL_ARB_sync
   GL_ARB_tessellation_shader
   GL_ARB_texture_border_clamp
   GL_ARB_texture_buffer_object
   GL_ARB_texture_buffer_object_rgb32
   GL_ARB_texture_compression
   GL_ARB_texture_compression_bptc
   GL_ARB_texture_compression_rgtc
   GL_ARB_texture_cube_map
   GL_ARB_texture_cube_map_array
   GL_ARB_texture_env_add
   GL_ARB_texture_env_combine
   GL_ARB_texture_env_crossbar
   GL_ARB_texture_env_dot3
   GL_ARB_texture_float
   GL_ARB_texture_gather
   GL_ARB_texture_mirrored_repeat
   GL_ARB_texture_multisample
   GL_ARB_texture_non_power_of_two
   GL_ARB_texture_query_lod
   GL_ARB_texture_rectangle
   GL_ARB_texture_rg
   GL_ARB_texture_rgb10_a2ui
   GL_ARB_texture_snorm
   GL_ARB_timer_query
   GL_ARB_transform_feedback2
   GL_ARB_transform_feedback3
   GL_ARB_transpose_matrix
   GL_ARB_uniform_buffer_object
   GL_ARB_vertex_array_bgra
   GL_ARB_vertex_array_object
   GL_ARB_vertex_attrib_64bit
   GL_ARB_vertex_buffer_object
   GL_ARB_vertex_program
   GL_ARB_vertex_shader
   GL_ARB_vertex_type_2_10_10_10_rev
   GL_ARB_viewport_array
   GL_ARB_window_pos
   GL_ATI_draw_buffers
   GL_ATI_envmap_bumpmap
   GL_ATI_fragment_shader
   GL_ATI_meminfo
   GL_ATI_separate_stencil
   GL_ATI_texture_compression_3dc
   GL_ATI_texture_env_combine3
   GL_ATI_texture_float
   GL_ATI_texture_mirror_once
   GL_EXT_abgr
   GL_EXT_bgra
   GL_EXT_bindable_uniform
   GL_EXT_blend_color
   GL_EXT_blend_equation_separate
   GL_EXT_blend_func_separate
   GL_EXT_blend_minmax
   GL_EXT_blend_subtract
   GL_EXT_compiled_vertex_array
   GL_EXT_copy_buffer
   GL_EXT_copy_texture
   GL_EXT_direct_state_access
   GL_EXT_draw_buffers2
   GL_EXT_draw_instanced
   GL_EXT_draw_range_elements
   GL_EXT_fog_coord
   GL_EXT_framebuffer_blit
   GL_EXT_framebuffer_multisample
   GL_EXT_framebuffer_object
   GL_EXT_framebuffer_sRGB
   GL_EXT_geometry_shader4
   GL_EXT_gpu_program_parameters
   GL_EXT_gpu_shader4
   GL_EXT_histogram
   GL_EXT_multi_draw_arrays
   GL_EXT_packed_depth_stencil
   GL_EXT_packed_float
   GL_EXT_packed_pixels
   GL_EXT_pixel_buffer_object
   GL_EXT_point_parameters
   GL_EXT_provoking_vertex
   GL_EXT_rescale_normal
   GL_EXT_secondary_color
   GL_EXT_separate_specular_color
   GL_EXT_shader_image_load_store
   GL_EXT_shadow_funcs
   GL_EXT_stencil_wrap
   GL_EXT_subtexture
   GL_EXT_texgen_reflection
   GL_EXT_texture3D
   GL_EXT_texture_array
   GL_EXT_texture_buffer_object
   GL_EXT_texture_compression_bptc
   GL_EXT_texture_compression_latc
   GL_EXT_texture_compression_rgtc
   GL_EXT_texture_compression_s3tc
   GL_EXT_texture_cube_map
   GL_EXT_texture_edge_clamp
   GL_EXT_texture_env_add
   GL_EXT_texture_env_combine
   GL_EXT_texture_env_dot3
   GL_EXT_texture_filter_anisotropic
   GL_EXT_texture_integer
   GL_EXT_texture_lod
   GL_EXT_texture_lod_bias
   GL_EXT_texture_mirror_clamp
   GL_EXT_texture_object
   GL_EXT_texture_rectangle
   GL_EXT_texture_sRGB
   GL_EXT_texture_shared_exponent
   GL_EXT_texture_snorm
   GL_EXT_texture_swizzle
   GL_EXT_timer_query
   GL_EXT_transform_feedback
   GL_EXT_vertex_array
   GL_EXT_vertex_array_bgra
   GL_EXT_vertex_attrib_64bit
   GL_IBM_texture_mirrored_repeat
   GL_KTX_buffer_region
   GL_NV_blend_square
   GL_NV_conditional_render
   GL_NV_copy_depth_to_color
   GL_NV_explicit_multisample
   GL_NV_float_buffer
   GL_NV_half_float
   GL_NV_primitive_restart
   GL_NV_texgen_reflection
   GL_NV_texture_barrier
   GL_SGIS_generate_mipmap
   GL_SGIS_texture_edge_clamp
   GL_SGIS_texture_lod
   GL_SUN_multi_draw_arrays
   GL_WIN_swap_hint
   WGL_EXT_swap_control

pyglet.gl.glu_info
------------------------------------------------------------------------------
glu_info.get_version(): 1.2.2.0 Microsoft Corporation
glu_info.get_extensions():
   GL_EXT_bgra

pyglet.gl.glx_info
------------------------------------------------------------------------------
GLX not available.

pyglet.media
------------------------------------------------------------------------------
driver: pyglet.media.drivers.directsound

pyglet.media.avbin
------------------------------------------------------------------------------
AVbin not available.

pyglet.media.drivers.openal
------------------------------------------------------------------------------
Library: <CDLL 'openal32', handle 4b20000 at 2777050>
Version: (1, 1)
Extensions:

Any additional info (platform/language/hardware) that may be relevant?
Loading other libraries works, also first loading avbin and then opengl32 works.

Original issue reported on code.google.com by sugoib...@gmail.com on 12 May 2011 at 11:33

[GoogleCodeExporter]

Windows is 7-x64 while the Python is 32-bit.
avbin.dll is located at C:\Windows\SysWOW64\avbin.dll which is the system 
directory used by 32bit applications. It is redirected at the Windows API level 
when loading libraries. Irrelevant by the fact the library can be loaded before 
opengl and work.

Original comment by sugoib...@gmail.com on 12 May 2011 at 11:38

[GoogleCodeExporter]

As a workaround an attempt to load AVBin DLL in the __init__.py of pyglet works 
for me. It's bit ugly solution though, but I have patch prepared if someone 
happens to need it. I think the bug should be reported to upstream Python to 
get a proper fix (if this is an issue with ctypes, that is).

Original comment by zok...@gmail.com on 8 Oct 2011 at 7:39

Attachments:

• babb34245aa4.patch

[GoogleCodeExporter]

Same here. The fix works for me too. 

Original comment by michal....@gmail.com on 2 Dec 2011 at 11:59

[GoogleCodeExporter]

Issue 546 has been merged into this issue.

Original comment by Adam.JT...@gmail.com on 11 Dec 2012 at 11:40

[GoogleCodeExporter]

Original comment by useboxnet on 17 Jul 2013 at 4:27

• Added labels: OpSys-Windows

[GoogleCodeExporter]

I ran into this issue this week. The suggested patch fixed the issue, but it 
seems like there should be a cleaner solution. I'll take a look if I have time. 
Juan, do you have any ideas for this one?

Original comment by larson.e...@gmail.com on 24 Apr 2014 at 3:49

[GoogleCodeExporter]

If I understand the report it looks like a problem with python itself and not a 
pyglet issue (windows 64-bit running python 32-bit), although the workaround 
may help.

Original comment by useboxnet on 24 Apr 2014 at 5:36

[GoogleCodeExporter]

Ahh, you're right. I wonder what's going on there -- seems like this issue 
would crop up in many other places if this were a problem with `cdll`. Maybe 
it's documented that `cdll` changes behavior based on what's been loaded...? It 
would be nice if there were some nice way to deal with it. I'll see if I can 
find something.

Original comment by larson.e...@gmail.com on 24 Apr 2014 at 5:41

[GoogleCodeExporter]

I still have to apply this patch any time I update Pyglet on my windows system. 
Is there a drawback to adding the patch upstream? It's not an elegant solution, 
but it works -- is it expected to break something?

Original comment by schoolbo...@gmail.com on 2 Jul 2014 at 3:51

[GoogleCodeExporter]

Actually the patch no longer works (maybe some upstream change affected it?), 
so on my system I just changed it so it doesn't try to import avbin anymore.

Original comment by schoolbo...@gmail.com on 2 Jul 2014 at 5:37

[GoogleCodeExporter]

What do you mean by "no longer works"? What's your OS/Python configuration? 

Original comment by michal....@gmail.com on 3 Jul 2014 at 5:32

[GoogleCodeExporter]

Windows 7 64-bit, running Python 2.7.6 32-bit. (I was commenting from my lab 
mate's account yesterday.) The fix worked (somehow) on previous versions of 
Pyglet -- I probably last updated it six months ago -- but now when I apply the 
suggested patch to the latest `tip.zip` it doesn't. I need the latest Pyglet in 
order for my audio player objects to have `.delete()` support, so reverting to 
an older Pyglet version where the patch works isn't an option in my case.

Original comment by larson.e...@gmail.com on 3 Jul 2014 at 1:49

[GoogleCodeExporter]

What happens if avbin.dll is in the same directory of your script.

Original comment by useboxnet on 3 Jul 2014 at 1:55

[GoogleCodeExporter]

Still fails. Just doing `from pyglet.media import Player` causes it to bomb. 
Removing Calling `from pyglet import Media` does not. And removing `avbin.dll` 
from the directory (and everywhere else on my system) allows it to pass. For 
now I've just removed `avbin.dll` from my system, which should prevent the 
problem. I think the modified date for my `avbin.dll` was sometime in 2013, is 
it possible an old version could be causing problems?

Original comment by larson.e...@gmail.com on 3 Jul 2014 at 2:59

[GoogleCodeExporter]

Possibly, just try version 11 alpha 4 from: 
https://github.com/AVbin/AVbin/downloads

It has some known issues with video but it fixes a lot of problems with audio.

Original comment by useboxnet on 3 Jul 2014 at 3:01

[GoogleCodeExporter]

Although that was released in 2012; well... worth a try.

I'd love to investigate this, I'll try to allocate time to play with Windows 
(ufff).

Original comment by useboxnet on 3 Jul 2014 at 3:03

[GoogleCodeExporter]

Once I realized that we can just remove `avbin` altogether as a workaround, the 
bug became much less problematic for us. So probably not so high a priority, at 
least at our end.

Original comment by larson.e...@gmail.com on 3 Jul 2014 at 3:17

[GoogleCodeExporter]

Hi! We still have this issue under 64bit win7, 32bit python 2.7.5, pyglet 
1.1.4. Removing the avbin dll is not an option for us, since we use pyglet for 
video/audio playback for data analysis.

The current workaround is to set the import order properly (i.e. "from 
pyglet.media import avbin" at early import stage), but every once in a while 
the issue arises again and we have to pollute more and more the codebase. Our 
user base is growing, so I'd appreciate your support :) Thanks

Original comment by gregorio...@gmail.com on 4 Jul 2014 at 7:23

[GoogleCodeExporter]

Gregorio: it's unlikely we will fix this on 1.1.4, our target is to get 1.2 out 
of the door ASAP.

I'm going to add this issue to the 1.2 release blockers list.

Original comment by useboxnet on 4 Jul 2014 at 7:38

• Changed state: Accepted
• Added labels: 1.2-release-blocker, OpSys-x64

[GoogleCodeExporter]

Sounds promising, thank you.

Original comment by gregorio...@gmail.com on 4 Jul 2014 at 8:17