Hi! Suprisingly not, Opera did the update to the 42.0.2393.137 this morning and every video is now playing fine oO. Well, thx for the pieces of advice, and long life to Opera!

Still having the same problem...

The driver seems up to date... And the restart didn't help

Just by restarting Opera or do u mean a reset? Because I'm on this browser only since a few weeks, and i've always had this kind of problem...

Here it is :

Log Messages
[0117/224721:ERROR:gles2_cmd_decoder.cc(16349)] : [.DisplayCompositor-0CDC4C60]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[0117/224721:ERROR:gles2_cmd_decoder.cc(9063)] : [.DisplayCompositor-0CDC4C60]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[0117/224721:ERROR:gles2_cmd_decoder.cc(9063)] : [.DisplayCompositor-0CDC4C60]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[0117/224721:ERROR:gles2_cmd_decoder.cc(9063)] : [.DisplayCompositor-0CDC4C60]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[0117/224721:ERROR:gles2_cmd_decoder.cc(9063)] : [.DisplayCompositor-0CDC4C60]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[0117/224721:ERROR:gles2_cmd_decoder.cc(9063)] : [.DisplayCompositor-0CDC4C60]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.

My laptop is the XPS 13 (2016). So the cpu is an i5 7200U, 8G0 LPDDR3, intel HD 620.
Btw, thanks for your answers and attention

Here is what i found under opera://gpu/, but i must confess i don't understand everything. Can somebody help me finding out whats wrong?

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: Hardware accelerated
Video Decode: Hardware accelerated
Video Encode: Hardware accelerated
VPx Video Decode: Software only, hardware acceleration unavailable
WebGL: Hardware accelerated

Driver Bug Workarounds

clear_uniforms_before_first_program_use
disable_discard_framebuffer
disable_framebuffer_cmaa
exit_on_context_lost
force_cube_complete
msaa_is_slow
scalarize_vec_and_mat_constructor_args
texsubimage_faster_than_teximage

Problems Detected

Accelerated VPx decoding is hanging on some videos.: 654111
Disabled Features: accelerated_vpx_decode
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
On Intel GPUs MSAA performance is not acceptable for GPU rasterization: 527565
Applied Workarounds: msaa_is_slow
Framebuffer discarding can hurt performance on non-tilers: 570897
Applied Workarounds: disable_discard_framebuffer
Limited enabling of Chromium GL_INTEL_framebuffer_CMAA: 535198
Applied Workarounds: disable_framebuffer_cmaa
Native GpuMemoryBuffers have been disabled, either via about:flags or command line.
Disabled Features: native_gpu_memory_buffers

I find it quite surprising that no one can help... Frankly, given this kind of problem and the dynamism of the community, Chrome Mozilla and Edge can sleep on both ears

No thought?

That's interesting. When i download them and play them for the first time with VLC, they briefly freeze where Opera stops, and then go on playing. On the second playing, they work fine.

Thx for the answer. The video works!

Btw, it reminds me of an other problem I have with webm videos: they sometimes launch, but stop after some time (usually around 1/5fth of the video) and i can't move forward.