Qt multimeia GStreamer-Critical error!

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.

JiujiuTong

@SGaist
well ,Thank you
i will try to compile QT5.7.1 against GStreamer 1.0. can you give me some instructions? thank you!
another thing is how to support hardware-accelerate? or it support it by default,but the default behavior of Gstreamer seem not enable hardware-accelerate.
my project finally runs on raspberry pi3, i do a lot efforts to make the QT5.7 deployed on rpi3. i'm worried about QT5.8....
i find a description:
1,install gstream1.0*
install libgstreamer1.0*
2, cd qt5.7.1
run ./configure -gstreamer 1.0
make
make install
is it right?

SGaist

You don't need to re-build everything, if you already have a build then just re-build the QtMultimedia module.

JiujiuTong

@SGaist
what should i do if i just want to rebuild QtMultimeida module with Gstreamer1.0? i have installed a QT with older GStreamer.
thank you !

JiujiuTong

@SGaist @jsulm @mrjj
i finish the reinstall work with all modules rebuild,the output result is still NG.
play the video with gstreamer command the output is below:
gst-play-1.0 /home/tong/build-FMT-gstream1_0-Debug/src/Wildlife.wmv
Press 'k' to see a list of keyboard shortcuts.
Now playing /home/tong/build-FMT-gstream1_0-Debug/src/Wildlife.wmv
libva info: VA-API version 0.39.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0
Redistribute latency...
Redistribute latency...
Redistribute latency...
0:00:30.0 / 0:00:30.0
Reached end of play list.
the video can play normally.

while the output of my project (also the same result with QT example):
libva info: VA-API version 0.39.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0
just pops a blackscreen ,no video shows. strange...

when i try to install gstreamer1.0
there is an error:
gstreamer1.0-hybris:i386:Depends: libmedia1:i386 but it is no going to be installed
E: Unable to correct problems, you have held broken packages.

SGaist

Is that on your Pi or on your desktop ? If on your Pi then there's something strange since it talks about a i386 version of the package and the Pi is an ARM based machine.

jsulm

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

gstreamer1.0-hybris:i386:Depends: libmedia1:i386

Are you trying to install x86 (32bit) version?