Oh, oh. Is that why YouTube videos have been spinning up my CPU fan lately? I'll have to try h264ify and see if that helps things. (I'm running Firefox on Arch Linux x86_64.)
Which hardware do you have? I'm on a Sandybridge Intel and I haven't managed to get satisfactory hardware acceleration on Arch + Firefox. Chromium manages to run any kind of video, including 60FPS 1080p without any lag, while on Firefox I get either audio or video lag. No idea why this happens.
I just tried h264ify and I don't notice any improvement on Firefox. Chrome CPU usage seems to be a little lower.
Chromium: I get around 140% CPU usage, spread on 3 processes, video smooth without dropped frames.
Firefox with MSE+HTML5 video: Goes from 30% to 170% CPU, on single process, but the video gets stuck for 3 seconds every second of play time. Totally unwatchable, unless I drop down to 30 fps.
I just tried h264ify and I don't notice any improvement on Firefox. Chrome CPU usage seems to be a little lower.
This is my go-to video test: https://www.youtube.com/watch?v=7SRTEXSpcyI
Chromium: I get around 140% CPU usage, spread on 3 processes, video smooth without dropped frames.
Firefox with MSE+HTML5 video: Goes from 30% to 170% CPU, on single process, but the video gets stuck for 3 seconds every second of play time. Totally unwatchable, unless I drop down to 30 fps.