OK, clarification on "lag" - during video playback, the picture will
"freeze" at random points, then jump forward to a new position when it
continues to play. This "freeze" will last anywhere from < 1 second up
to 10 to 15 seconds. The video that would normally be played during this
"freeze" is never played, it is simply skipped over. Sometimes, during
these lag moments, I notice that video playback will resume if the mouse
cursor is moved (whether that is coincidence or cause I do not know -
but moving the mouse cursor does not always cause resumption of
playback). When video playback continues, it is usually resynchronized
with audio (there was no pause, freeze, or lag in the audio output, only
in the video). It does not always occur at the same point in playback,
even in the same video file.
Here is output from mpv during playback of the test video. I did not
catch "dmesg" or "top" during the lags - I will give that another try
later today when I have a few minutes to look into it.
tracy@tracy-hp:/mnt/VM$ mpv bbb_sunflower_1080p_60fps_normal.mp4
Playing: bbb_sunflower_1080p_60fps_normal.mp4
(+) Video --vid=1 (*) (h264 1920x1080 60.000fps)
(+) Audio --aid=1 --alang=und (*) (mp3 2ch 48000Hz)
Audio --aid=2 --alang=und (*) (ac3 6ch 48000Hz)
File tags:
Artist: Blender Foundation 2008, Janus Bager Kristensen 2013
Comment: Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
Composer: Sacha Goedegebure
Genre: Animation
Title: Big Buck Bunny, Sunflower version
AO: [pulse] 48000Hz stereo 2ch s16
Using hardware decoding (vaapi).
VO: [opengl] 1920x1080 vaapi[nv12]
AV: 00:06:26 / 00:10:34 (60%) A-V: 0.000 Dropped: 26
Audio/Video desynchronisation detected! Possible reasons include too slow
hardware, temporary CPU spikes, broken drivers, and broken files. Audio
position will not match to the video (see A-V status field).
AV: 00:10:34 / 00:10:34 (100%) A-V: 0.000 Dropped: 636
Exiting... (End of file)
tracy@tracy-hp:/mnt/VM$
Note that /mnt/vm is a partition on an SSD drive attached to the
internal SATA bus, so there shouldn't be any I/O delays causing the
problem.
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to gstreamer1.0 in Ubuntu.
https://bugs.launchpad.net/bugs/1774915
Title:
Video lag when using totem (audio does not lag)
Status in gnome-shell package in Ubuntu:
Incomplete
Status in gstreamer1.0 package in Ubuntu:
Incomplete
Bug description:
Advised to file a bug report after posting on "Call for testing: Video
playback in 18.04".
Running 18.04 LTS as fresh install (not upgraded from previous version
- older version still installed in separate partition). Xorg session.
System: HP Pavillion DV7 (lm726av) - Intel Core i7 2630 processor,
integrated Intel video
Playing any local video file (regardless of video format - flv, mp4,
avi), the video will randomly lag in playback. Audio is not affected,
it plays back correctly. Very occasional lags in browsers (Firefox and
Chrome) on pages with a lot of active graphics (flash or HTML5).
Browser lags significantly improved after installing synaptic driver
for touchpad operation (I have no idea why this would affect video
playback - I simply note that it happened).
I can pick a random video on YouTube and watch it in Firefox or Chrome
without lag (even full-screen). However, if I grab a local copy of the
video (using, for instance, Clipgrab) and play it using Totem, I get
lag.
I was also advised to try using mpv - I still get lag in mpv, although
not as pronounced.
tracy@tracy-hp:~$ sudo apt-cache policy totem
[sudo] password for tracy:
totem:
Installed: 3.26.0-0ubuntu6
Candidate: 3.26.0-0ubuntu6
Version table:
*** 3.26.0-0ubuntu6 500
500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
100 /var/lib/dpkg/status
I was also asked to include output of lspci -k - shown below:
tracy@tracy-hp:~$ lspci -k
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family
DRAM Controller (rev 09)
Subsystem: Hewlett-Packard Company 2nd Generation Core Processor Family
DRAM Controller
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core
Processor Family PCI Express Root Port (rev 09)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)
Subsystem: Hewlett-Packard Company 2nd Generation Core Processor Family
Integrated Graphics Controller
Kernel driver in use: i915
Kernel modules: i915
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series
Chipset Family MEI Controller #1 (rev 04)
Subsystem: Hewlett-Packard Company 6 Series/C200 Series Chipset Family
MEI Controller
Kernel driver in use: mei_me
Kernel modules: mei_me
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family
USB Enhanced Host Controller #2 (rev 05)
Subsystem: Hewlett-Packard Company 6 Series/C200 Series Chipset Family
USB Enhanced Host Controller
Kernel driver in use: ehci-pci
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family
High Definition Audio Controller (rev 05)
Subsystem: Hewlett-Packard Company 6 Series/C200 Series Chipset Family
High Definition Audio Controller
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI
Express Root Port 1 (rev b5)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI
Express Root Port 2 (rev b5)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI
Express Root Port 3 (rev b5)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI
Express Root Port 4 (rev b5)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family
USB Enhanced Host Controller #1 (rev 05)
Subsystem: Hewlett-Packard Company 6 Series/C200 Series Chipset Family
USB Enhanced Host Controller
Kernel driver in use: ehci-pci
00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC
Controller (rev 05)
Subsystem: Hewlett-Packard Company HM65 Express Chipset Family LPC
Controller
Kernel driver in use: lpc_ich
Kernel modules: lpc_ich
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset
Family 6 port SATA AHCI Controller (rev 05)
Subsystem: Hewlett-Packard Company 6 Series/C200 Series Chipset Family
6 port Mobile SATA AHCI Controller
Kernel driver in use: ahci
Kernel modules: ahci
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus
Controller (rev 05)
Subsystem: Hewlett-Packard Company 6 Series/C200 Series Chipset Family
SMBus Controller
Kernel modules: i2c_i801
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Whistler [Radeon HD 6730M/6770M/7690M XT] (rev ff)
Kernel driver in use: radeon
Kernel modules: radeon
07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
Subsystem: Hewlett-Packard Company RTL8111/8168/8411 PCI Express
Gigabit Ethernet Controller
Kernel driver in use: r8169
Kernel modules: r8169
0d:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
[Condor Peak]
Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
13:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5209 PCI
Express Card Reader (rev 01)
Subsystem: Hewlett-Packard Company RTS5209 PCI Express Card Reader
Kernel driver in use: rtsx_pci
Kernel modules: rtsx_pci
19:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller
(rev 04)
Subsystem: Hewlett-Packard Company uPD720200 USB 3.0 Host Controller
Kernel driver in use: xhci_hcd
You will note that the system has both the integrated Intel video and
an ATI Radeon card installed - the system is using the integrated
Intel video.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: libgstreamer1.0-0 1.14.0-1
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Jun 3 22:52:48 2018
InstallationDate: Installed on 2018-05-09 (25 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gstreamer1.0
UpgradeStatus: No upgrade log present (probably fresh install)
XorgLog: Error: [Errno 2] No such file or directory: '/var/log/Xorg.0.log'
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