Help needed with strange audio desync issue when streaming video

[taisingera]

I have a Dell XPS L702x with i7 2720qm, 8GB DDR3, hard drive, Nvidia GT550M, latest and last BIOS A19 and Win10 Home. When I play a video file from the hard drive, using headphones or built in speakers (basically on-board sound), there is no problem. When I watch any long streaming video (Youtube, Netflix, or any HTML5 stream), more than 30 minutes, the video starts lagging behind the audio and plateaus to around 1 second lag. I can pause and resume the video and that fixes it for a while. This also happens when I hook the laptop to a monitor through HDMI.

Now when I watch streaming video with either a USB speaker or bluetooth audio, I don't see any lag happen.

I have downloaded and run LatencyMon and after a few seconds, I get full red line Page Faults, and then usually the network driver latency becomes a problem after a minute, quicker if I am actively streaming.

I have Nvidia drivers 376, and the latest drivers for the Realtek onboard sound. Can anybody help with this issue?

 

[Burpo]

Didn't say what browser you're using, unless it's Edge you may want to try installing Silverlight.

https://www.microsoft.com/getsilverlight/Get-Started/Install/Default.aspx

 

[taisingera]

Finally got around to testing this out. Using only the analog built in audio of the laptop. Here are the results, playing Netflix videos:
Firefox audio/video out of sync
Chrome audio/video out of sync
MS Edge audio/video IN sync for entire time
Firefox (hardware acceleration unchecked) audio/video out of sync

when it got out of sync, I pause the video, it resyncs but then it happens again.

Also tried hooking this laptop up to a monitor with speakers, so using HDMI audio out, and it also went out of sync using Firefox.

So using analog audio on this laptop, only Edge plays Netflix and presumably streaming video in sync with audio.

This doesn't happen on my desktop (i3 4330, 8GB, Win10, Intel HD) or on my other laptop (i5 2450M, 8GB, Win10, Intel HD)