And here is the backtrace for that error:

```
#0  0x00007ffff6263e97 in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff6265801 in __GI_abort () at abort.c:79
#2  0x00007ffff625539a in __assert_fail_base (fmt=0x7ffff63dc7d8 "%s%s%s:%u: 
%s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7fffa5055b4c "0", 
file=file@entry=0x7fffa4d4bdf0 "gen9_mfd.c", line=line@entry=649, 
function=function@entry=0x7fffa4d4c500 
"gen9_hcpd_get_reference_picture_frame_id") at assert.c:92
#3  0x00007ffff6255412 in __GI___assert_fail (assertion=0x7fffa5055b4c "0", 
file=0x7fffa4d4bdf0 "gen9_mfd.c", line=649, function=0x7fffa4d4c500 
"gen9_hcpd_get_reference_picture_frame_id") at assert.c:101
#4  0x00007fffa4c14b41 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
#5  0x00007fffa4c14c97 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
#6  0x00007fffa4c16802 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
#7  0x00007fffa5c09820 in vaEndPicture () at 
/usr/lib/x86_64-linux-gnu/libva.so.2
#8  0x00007fffa66b6cf3 in  () at 
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#9  0x00007fffa66cea7d in  () at 
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#10 0x00007fffa66a9563 in  () at 
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#11 0x00007fffa668dd12 in  () at 
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#12 0x00007ffff55a9b71 in  () at /usr/lib/x86_64-linux-gnu/libgstvideo-1.0.so.0
#13 0x00007ffff55b215f in gst_video_decoder_have_frame () at 
/usr/lib/x86_64-linux-gnu/libgstvideo-1.0.so.0
#14 0x00007fffa668c8da in  () at 
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#15 0x00007ffff55a9d33 in  () at /usr/lib/x86_64-linux-gnu/libgstvideo-1.0.so.0
#16 0x00007ffff55ac6fc in  () at /usr/lib/x86_64-linux-gnu/libgstvideo-1.0.so.0
#17 0x00007ffff55acd42 in  () at /usr/lib/x86_64-linux-gnu/libgstvideo-1.0.so.0
#18 0x00007ffff5d285fb in  () at /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#19 0x00007ffff5d30933 in gst_pad_push () at 
/usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#20 0x00007ffff5d1692b in gst_proxy_pad_chain_default () at 
/usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#21 0x00007ffff5d285fb in  () at /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#22 0x00007ffff5d30933 in gst_pad_push () at 
/usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#23 0x00007fffd589c514 in  () at 
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstcoreelements.so
#24 0x00007ffff5d5cf79 in  () at /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#25 0x00007ffff7668ad0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007ffff7668105 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ffff213c6db in start_thread (arg=0x7fffa7154700) at 
pthread_create.c:463
#28 0x00007ffff634688f in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
```

-- 
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/1818862

Title:
  Totem player hangs when seeking video

Status in totem package in Ubuntu:
  Incomplete

Bug description:
  Totem player hangs as soon as I click on the bar at the bottom to seek
  to a specific time in an mp4 video.

  Video in question can be found here:
  https://cdn.media.ccc.de/congress/2018/h264-hd/35c3-9370-eng-deu-
  Hacking_how_we_see_hd.mp4

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: totem 3.26.0-0ubuntu6.2
  ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
  Uname: Linux 4.15.0-45-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Mar  6 16:10:11 2019
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-12-08 (453 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  SourcePackage: totem
  UpgradeStatus: Upgraded to bionic on 2018-05-02 (308 days ago)

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