So there's just no solution?

Ok, I installed K-Lite, clean the cache, restarted pc. The mp4 video you linked me before can be easily viewed now with windows media player, but still not in Opera (as well as Fb videos and gifs) more ideas?

Yea but windows can play Gif, why Opera, on facebook, can't?

Opera://gpu shows as follow:

Graphics Feature Status
Canvas: Hardware accelerated
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Rasterization: Software only. Hardware acceleration disabled
Video Decode: Software only. Hardware acceleration disabled
Video Encode: Hardware accelerated
VPx Video Decode: Software only. Hardware acceleration disabled
WebGL: Hardware accelerated
Driver Bug Workarounds
clear_uniforms_before_first_program_use
disable_direct_composition
disable_discard_framebuffer
disable_dxgi_zero_copy_video
disable_framebuffer_cmaa
exit_on_context_lost
force_cube_complete
scalarize_vec_and_mat_constructor_args
texsubimage_faster_than_teximage
use_current_program_after_successful_link
Problems Detected
VPx decoding isn't supported before Windows 10 anniversary update.: 616318
Disabled Features: accelerated_vpx_decode
Always call glUseProgram after a successful link to avoid a driver bug: 349137
Applied Workarounds: use_current_program_after_successful_link
Some drivers are unable to reset the D3D device in the GPU process sandbox
Applied Workarounds: exit_on_context_lost
TexSubImage is faster for full uploads on ANGLE
Applied Workarounds: texsubimage_faster_than_teximage
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
ANGLE crash on glReadPixels from incomplete cube map texture: 518889
Applied Workarounds: force_cube_complete
Framebuffer discarding can hurt performance on non-tilers: 570897
Applied Workarounds: disable_discard_framebuffer
Direct composition flashes black initially on Win <10: 588588
Applied Workarounds: disable_direct_composition
Zero copy DXGI video hangs on shutdown on Win < 8.1: 621190
Applied Workarounds: disable_dxgi_zero_copy_video
Limited enabling of Chromium GL_INTEL_framebuffer_CMAA: 535198
Applied Workarounds: disable_framebuffer_cmaa
Zero-copy NV12 video displays incorrect colors on NVIDIA drivers.: 635319
Applied Workarounds: disable_dxgi_zero_copy_video
Accelerated video decode has been disabled, either via blacklist, about:flags or the command line.
Disabled Features: video_decode

[1213/224926:ERROR:angle_platform_impl.cc(33)] : ANGLE Display::initialize error 5: DXGI 1.2 required to present to HWNDs owned by another process.
[1213/224926:ERROR:gl_surface_egl.cc(612)] : eglInitialize D3D11 failed with error EGL_NOT_INITIALIZED, trying next display type
[1213/233819:ERROR:angle_platform_impl.cc(33)] : ANGLE Display::initialize error 5: DXGI 1.2 required to present to HWNDs owned by another process.
[1213/233819:ERROR:gl_surface_egl.cc(612)] : eglInitialize D3D11 failed with error EGL_NOT_INITIALIZED, trying next display type

There are the log messages errors.

I didn't install any codec.

I can't play that video on Windows player, but i can play it on VLC. Anyway the codec problem could somehow be related to gif images too? Cuz i don't see them also.

Ok found, there is -> Gpu process: 104mb (morless)

I just don't understand those " : " should be something written after it?

How to check it?

So what to do?

OMG I was wrong, win correct version is Windows NT 6.1.7601 SP1... (ive too many pcs :D)

...and no, my windows is windows 7 64 bit ultimate service pack 1