This is probably not a bug but more a feature request. Videos played in Falkon could be GPU accelerated using VAAPI. This would lower CPU usage and provide smoother experience while browsing internet.
Does 'falkon --ignore-gpu-blacklist' work for you?
(In reply to magiblot from comment #1) > Does 'falkon --ignore-gpu-blacklist' work for you? I am not sure. Do you know how can I force h264 on youtube, because I cant decode vp9?
I don't think you can. You have to find a video that hasn't been encoded to vp9. For example, this one: https://www.youtube.com/watch?v=jZl_xhmbN3M
(In reply to magiblot from comment #3) > I don't think you can. You have to find a video that hasn't been encoded to > vp9. > > For example, this one: https://www.youtube.com/watch?v=jZl_xhmbN3M I have found another one h264 1080p60 but it looks like only CPU is used. If I found a 4K60 video in h264 that would decide my problem without any doubt.
I'm afraid these do no longer exist. According to "youtube-dl -F" of some 4K videos, 1080p is the greatest resolution with avc encodes. 1440p and 2160p get vp9 directly. So, you will have to find another website. However, you can also have falkon playing local mp4 files (not avi or mkv) by dragging them into the window. Anyway, I used --ignore-gpu-blacklist to remove the "--disable-accelerated-video-decode" option in the QtWebEngineProcess processes (according to htop) in my integrated Intel graphics. I read it in some obscure QupZilla issue from GitHub. Here are some more options you might want to try: https://github.com/QupZilla/qupzilla/issues/1952
(In reply to magiblot from comment #5) > I'm afraid these do no longer exist. According to "youtube-dl -F" of some 4K > videos, 1080p is the greatest resolution with avc encodes. 1440p and 2160p > get vp9 directly. So, you will have to find another website. > > However, you can also have falkon playing local mp4 files (not avi or mkv) > by dragging them into the window. > > Anyway, I used --ignore-gpu-blacklist to remove the > "--disable-accelerated-video-decode" option in the QtWebEngineProcess > processes (according to htop) in my integrated Intel graphics. I read it in > some obscure QupZilla issue from GitHub. Here are some more options you > might want to try: https://github.com/QupZilla/qupzilla/issues/1952 Using local 4K60 video confirmed that GPU is not used.
What's your graphics card?
Intel HD 4400
I tried many cli options but none worked. Anyway, this looks like a QtWebEngine issue: https://wiki.qt.io/QtWebEngine/VideoAcceleration I wonder what the developer thinks about this.
Maybe an extension could be made that replaces the YouTube player with mpv. This is a crazy idea, however. I don't see it feasible.
(In reply to magiblot from comment #10) > Maybe an extension could be made that replaces the YouTube player with mpv. > This is a crazy idea, however. I don't see it feasible. Something similar was made for Firefox but I dont know its current state.
As already noted, it is not supported by QtWebEngine.
*** Bug 407308 has been marked as a duplicate of this bug. ***