OK, I have now encountered a few reasons for totem stuttering... 1. Excessive/faulty tags parsing (only seen in Big Buck Bunny videos?). Upstream has fixed the root cause: https://bugzilla.gnome.org/show_bug.cgi?id=786561 but we have also patched totem itself in Ubuntu to avoid the issue: https://launchpad.net/ubuntu/+source/totem/3.25.90.1-0ubuntu2
2. Excessive CPU usage of clutter-gtk particularly under Wayland -> bug 1698282 3. Insufficient buffering/parallelism in GStreamer. BBB tends to have a big stutter when the video bitrate spikes over 11Mbps. I'm not aware of any other reports of the problem though. 4. My experimental fixes for the high CPU usage of clutter-gtk in bug 1698282 reintroduces an old smoothness problem that only occurs under the default setting of CLUTTER_BACKEND=gdk (but not with CLUTTER_BACKEND=wayland or x11). I'll try to fix that somewhere between bug 1698282 and this one. ** Bug watch added: GNOME Bug Tracker #786561 https://bugzilla.gnome.org/show_bug.cgi?id=786561 ** Also affects: gstreamer (Ubuntu) Importance: Undecided Status: New ** Changed in: gstreamer (Ubuntu) Status: New => Triaged ** Changed in: gstreamer (Ubuntu) Importance: Undecided => Medium ** Also affects: clutter-gtk (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to totem in Ubuntu. https://bugs.launchpad.net/bugs/1698270 Title: Totem pauses and stutters during video playback even when CPU usage is low Status in Totem: Incomplete Status in clutter-1.0 package in Ubuntu: New Status in clutter-gtk package in Ubuntu: New Status in gstreamer package in Ubuntu: Triaged Status in totem package in Ubuntu: Fix Released Bug description: Totem pauses and stutters during video playback even when CPU usage is low. After figuring out how to play videos with full hardware accelerated decoding (e.g. <= 10% CPU), I was surprised to find Totem still pauses and stutters during playback. Other apps like Mplayer, VLC and even gst-play-1.0 never have this problem. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: totem 3.24.0-0ubuntu1 ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15 Uname: Linux 4.10.0-22-generic x86_64 ApportVersion: 2.20.5-0ubuntu4 Architecture: amd64 Date: Fri Jun 16 12:03:18 2017 InstallationDate: Installed on 2017-05-03 (44 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170502) SourcePackage: totem UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/totem/+bug/1698270/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
