Youtube dropping frames with HW Accel On after 4.3 update

rapierx2

After update to 4.3 now Youtube drops frames on 60fps videos at 720p or higher, even when they're not at fullscreen.

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Disabling HW Accel works, but I want to continue using Hardware Acceleration...

CPU: R7 2700X, GPU: GTX 1080, Windows 10.

Graphics Feature Status
Canvas: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Out-of-process Rasterization: Hardware accelerated
OpenGL: Enabled
Rasterization: Hardware accelerated
Skia Renderer: Enabled
Video Decode: Hardware accelerated
Vulkan: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated

Pathduck

@rapierx2 Hardly any frame drops here, Vivaldi 4.3 Stable, Windows 10 21H1 x64, H/W accel. enabled, i7-4790K , GTX 970.

Possibly a codecs issue on your system? Do you have any codec packs installed? Codec packs always cause a mess of trouble and are not recommended. Or maybe some extension forcing a change of codec on videos?

Please try the troubleshooting steps first, especially testing in a clean profile:
https://help.vivaldi.com/desktop/troubleshoot/troubleshooting-issues/

Edit: No framedrops on a AV1 codecs test video either.

rapierx2

I only use LAVFilters as codecs.

It worked on 4.2 but not on 4.3. If I install 4.2 using Snapshot profile it works as intended.

I found that Vivaldi video decoding is also pretty dependent on driver options. I had the same problem on Vivaldi 4.2 but I solved disabling Background Application Max Framerate for Vivaldi on Nvidia Control Panel (it was enabled as a global setting).

iAN CooG

@rapierx2 Good for you that you found a solution to this problem, this could be helping others with the same issue. If you can report to https://vivaldi.com/bugreport/ explaining the solution worked on 4.2 and not on 4.3, maybe devs can replicate it. It could be a problem on the gtx1080 drivers.

rapierx2

Now I can't consistently replicate the problem in all H264 60fps videos.

If CPU is idle, Youtube drops more frames. If I'm stressing the CPU using another program, like encoding a video, Youtube drops much less frames.

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