I got a weird issue after Vivaldi updated and the vivaldi-ffmpeg-codecs. All video, Twitch and Youtube was just white. Sound worked just fine. Ran through the troubleshooting steps on Vivaldis site, still the same.
Fix, in my case:
cd /var/cache/pacman/pkg
sudo pacman -U ffmpeg4.4-4.4.6-2-x86_64.pkg.tar.zst
Also tried first with ffmpeg4.4-4.4.6-1-x86_64.pkg.tar.zst, worked just the same. Don’t know why. I have video now.
I have recent ongoing issues with Vivaldi and vivaldi-ffmpeg-codecs as well in a topic here.
I read it. I could start Vivaldi just fine. Tried deleting everything and uninstalling Vivaldi then installing it again. I don’t remember the exact sequence of events. It started complaining about profiles, it could not find mine. And did not seem to have any access to kwallet. Which mucked things up badly. I restored to an earlier clone OS image at this point and started over with the troubleshooting. Reinstalling ffmpeg was what helped in the end.
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Yeah, re-activating Kwallet was first thing I did, since it was the first thing it complained about. After that, it went to what I described in the post.
Hi @ilenisaatio and @zhongsiu ,
I wonder whether you both could share with us the output of the following terminal command, in order to receive more help.
inxi -v7azy
I have received an update for the vivaldi browser package today. Maybe you could install it and try again.
Regards,
My Vivaldi is already the latest. Think I updated yesterday. Once I restored the clone image. And my problem is solved. Just sharing it.
I did try Qutebrowser and on there, video worked just fine. So it was Vivaldi that struggled, for me.
EDIT: Yeah, it isn’t fixed. I just had changed it to Hardware acceleration OFF.
Chromium works fine. I think Arch wiki mentioned Chromium having va-api baked in. Either way, my Vivaldi is messed up right now for video. I tried downgrading all the ffmpeg packages, made no difference. My CPU heats up and fan starts spinning on software acc. so I am using Chromium right now.
EDIT 2: Well, well. Seems to be a bug on Brave too. In terminal: vivaldi --enable-features=VaapiIgnoreDriverChecks,Vulkan,DefaultANGLEVulkan,VulkanFromANGLE
This works, I got video
Relevant thread: Vulkan does not work correctly on wayland · Issue #43097 · brave/brave-browser · GitHub
My inxi-output is already on the other post I linked to in the first comment to this post. 
The issue is already bypassed for me by adding --disable-accelerated-video-decode to the command line parameters. We’ve mainly just kept on prodding the issue out of curiosity, since it’s unintended behaviour and would be nice to figure out what caused it.
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