135298 2014-07-25 11:39:53 -0700 [GTK] Extremely jerky HD video playback with webkitgtk2 2.4.4 and intel HD 3000 2017-03-11 11:02:03 -0800 1 1 1 Unclassified WebKit WebKitGTK 528+ (Nightly build) PC Linux NEW P3 Normal --- 1 lviggiani webkit-unassigned bugs-noreply oldest_to_newest 1024869 0 235531 lviggiani 2014-07-25 11:39:53 -0700 Created attachment 235531 Test program I'm on Arch Linux 64Bit and GNOME Shell 3.12. Using Gnome Web (Epiphany) or by compilig the attached vala test program and opening youtube.com, If I try to playback any hd video either in windowed or full screen mode, playback is extremely jerky. The same video plays smoothly on chrome or firefox. That's the user agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/538.15 (KHTML, like Gecko) Version/8.0 Safari/538.15 Epiphany/3.12.1 235531 2014-07-25 11:39:53 -0700 2014-07-25 11:39:53 -0700 Test program valawebkit.vala application/octet-stream 492 lviggiani dXNpbmcgR3RrOwp1c2luZyBXZWJLaXQ7CgpwdWJsaWMgY2xhc3MgVmFsYVdlYmtpdCA6IFdpbmRv dyB7CgkKCXByaXZhdGUgV2ViVmlldyB3ZWJfdmlldzsKCglwdWJsaWMgVmFsYVdlYmtpdCgpewoJ CXRoaXMudGl0bGUgPSAiVGVzdGluZyB5b3V0dWJlIjsKCQlzZXRfZGVmYXVsdF9zaXplICg4MDAs IDYwMCk7CgoJCXdlYl92aWV3ID0gbmV3IFdlYlZpZXcoKTsKCQlhZGQod2ViX3ZpZXcpOwoKCQkv L3RoaXMud2ViX3ZpZXcub3BlbiAoImh0dHA6Ly93d3cueW91dHViZS5jb20vIik7CgkJdGhpcy53 ZWJfdmlldy5sb2FkX3VyaSAoImh0dHBzOi8vd3d3LnlvdXR1YmUuY29tLyIpOwoJfQoKCXB1Ymxp YyBzdGF0aWMgaW50IG1haW4gKHN0cmluZ1tdIGFyZ3MpIHsKICAgICAgICBHdGsuaW5pdCAocmVm IGFyZ3MpOwoKICAgICAgICBuZXcgVmFsYVdlYmtpdCgpLnNob3dfYWxsKCk7CiAgICAgICAgR3Rr Lm1haW4oKTsKCiAgICAgICAgcmV0dXJuIDA7CiAgICB9Cn0K