Qt multimeia GStreamer-Critical error!

JiujiuTong

@SGaist
do you mean Gstreamer plugins?
i try to follow the tips "Install GStreamre on Ubuntu or Debian" inbelow
https://gstreamer.freedesktop.org/documentation/installing/on-linux.html
but the command fails ,so i do not know exactly how many plugins for GStreamer...

SGaist

What exact command did you use ?

jsulm

@JiujiuTong On that page it is:

apt-get install ....

this for sure cannot work - you need to replace .... with actual package names.
Looks like GStreamer folks do not like/use Debian/Ubuntu :-)

mrjj

It might be something like
sudo apt-get install ubuntu-restricted-extras
some also had to do
apt-get install gstreamer0.10-alsa

but it was in older ubuntu. Didnt try in newest.
https://ubuntuforums.org/showthread.php?t=1101525

JiujiuTong

@SGaist @jsulm @mrjj
i use the following command
sudo apt-get gstreamer1-devel gstreamer1-plugins-base-tools gstreamer1-devel-docs gstreamer1-plugins-base-devel gstreamer1-plugins-base-devel-docs gstreamer1-plugins-good gstreamer1-plugins-good-extras gstreamer1-plugins-ugly gstreamer1-plugins-ugly-devel-docs gstreamer1-plugins-bad-free gstreamer1-plugins-bad-free-devel gstreamer1-plugins-bad-free-extras.
these plugins seems do not exist.

so i use sudo apt-cache search gstreamer* , and install many plugins,
including gstreamer1.0-plugins-ugly, gstreamer1.0-plugins-bad, gstreamer1.0-plugin-good
now there is only one warning:
GStreamer: unable to pause pause- "file:///home/tong/src/Wildlife.wmv"
warning: no decoder available for type "video/x-ms-asf"
seems need to install decoders...

another question:
As my target is rapsberry pi3,i try to play video with default GStreamer command，the video is not fluency. i need to enable hardware-accelerate when using QT to play video, Does QT support this feature when play video? how to enable it ? thank you !

jsulm

@JiujiuTong

Install gstreamer1-plugins-ugly plug-in for video/x-ms-asf

JiujiuTong

@jsulm @SGaist @mrjj
there seems something strange, as Gstreamer0.10-plugins-ugly is no longer available, when i remove all gstreamer0.1 packages, i try to run my project, there is info:
defaultserviceprovider::requestservice(): no service found for - "org.qt-project.qt.mediaplayer".
then i reinstall all gstreamer0.1 packages.
the info is :
GStreamer: unable to pause pause- "file:///home/tong/src/Wildlife.wmv"
warning: no decoder available for type "video/x-ms-asf"
does it mean QT still use gstreamer0.1 package?
but gstreamer0.10-plugins-bad, gstreamer0.10-plugins-ugly no long available.
i have installed gstreamer1.0-plugins-ugly, gstreamer1.0-plugins-bad, gstreamer1.0-plugin-good.

jsulm

@JiujiuTong said in Qt multimeia GStreamer-Critical error!:

but gstreamer0.10-plugins-bad, gstreamer0.10-plugins-ugly no long available

Are you sure: https://launchpad.net/ubuntu/xenial/+package/gstreamer0.10-plugins-ugly ?
Did you activate "universe", "restricted" and "multiverse" repositories?

JiujiuTong

@jsulm
i have check all repositories in ubuntu software tab.
are there other ways to check the repositories ?

jsulm

@JiujiuTong Did you activate universe repository?
If so then

sudo apt-get install gstreamer0.10-plugins-ugly

should be enough.
I'm usually using synaptic graphical tool - you can search for gstreamer0.10-plugins-ugly there as well and check whether universe repository is activated.
Also you can use

apt-cache search gstreamer0.10-plugins-ugly

to search.

JiujiuTong

@jsulm
i have checked the four repositories in system settings ->software& updates->ubuntu software tab.
but failed to run sudo apt-get install gstreamer0.10-plugins-ugly
info:
Package gstreamer0.10-plugins-ugly is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'gstreamer0.10-plugins-ugly' has no installation candidate

jsulm

@JiujiuTong OK, looks like it is really not available on Ubuntu 16.04

JiujiuTong

@jsulm @SGaist @mrjj
Then what should i do with my project ?
is there anyway to combine the QT with gstreamer1.0 ?

jsulm

@JiujiuTong Can you play this file with, for example, VLC?

SGaist

IIRC, since 5.8 the backend uses GStreamer 1.0. Otherwise, you can re-build the QtMultmedia module yourself against GStreamer 1.0

On a side note, unless you need specific features or bug fixes of more recent versions, why not use your distribution provided Qt for development ?

JiujiuTong

@jsulm
yes,i can play file with VLC, but there are some other logical with my project, and i need to control playlist and other thing. so i think the best way is use functions provided by QT.

jsulm

@JiujiuTong I didn't say you should use VLC - I only wanted to know whether the file is broken.

JiujiuTong

@jsulm
the file is OK, it can be played by double click

JiujiuTong

@SGaist
sorry for my poor English, do you mean i should use the latest QT version ?

SGaist

It depends on what you need, either use the Qt from your distribution or indeed a more recent version. Current is 5.8.0 and 5.9Beta2 is available.