Konqueror broweser Hdmi cable Audio and not supported Video issues

I have installed successfully kde plasma desktop on my freebsd 12.1 Release version with intel driver and everything goes fine. However I suspect the system does not recognizes audio cards and does not install audio drivers.
The PC is connected via hdmi port to a monitor, which has speakers.

Moreover after I installed firefox or the konqueror browser it freeses just after I want to watch a video. How is this even possible?
Please help address the situation
 
The video simply does not play on the browser. Only the video freeses. I can skip 5 seconds to see the next frame though. It also shows a text saying that if video is not playable restart the system.
 
Do you have the graphics drivers installed?

You can also start firefox from within a terminal, and maybe there will be some useful output.. Or try youtube in a different browser for troubleshooting, e.g. Chromium.
 
I installed graphics driver on my PC and it works just fine.
So how do I open firefox from shell?
Please provide details.
Also the chromium browser plays videos as awful as firefox does
 
  1. If you have one firefox profile run this:
    firefox
  2. If you have multiple firefox profiles, try this:
  3. Run firefox
  4. In the address bar type: about:support
  5. Press enter
  6. Search for a field named "Profile Folder"
  7. Take a note of directory, written in front of the "Profile Folder"
  8. The last field on the path is your profile name. take a note
  9. Open a termnial emulator and type this:
    firefox --no-remote -P "Profile Name"
  10. If you've imported your profile from another OS and getting error regarding of version mismatch, try this:
    firefox --allow-downgrade --no-remote -P "Profile Name"
  11. If everything is fine, write a shell script and put it on some directory in which presented in PATH. For example:
    1. I have a folder for my customized scripts and binaries, let's say ~/bin
    2. I've added ~/bin to my ~/.profile
      Code:
      PATH="$PATH:/usr/home/userx/bin"
      export PATH
      /usr/home/userx/bin refers to my ~/bin
    3. Then I put a script in ~/bin, e.g.
      ~/bin/fireduck
    4. Code:
      #!/bin/sh
      firefox --no-remote -P "Profile Name"
  12. Now I can run firefox from terminal by issuing following command:
    fireduck
 
Hard to say what's going wrong. If videos don't work in Firefox _and_ in Chromium, then the problem might be somewhere else.
Can you post the contents of /var/log/Xorg.0.log?
 
In my experience, if the audio device is blocked or faulty, nothing will play in the browser.

What is the output of cat /dev/sndstat?

And does the sound work outside the browser?
 
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