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Solved it. <br>
I was launching gstreamer as root when I have started gnome as user.<br>
<br>
Thanks<br>
<br>
<br>
Il 23/08/2020 01.26, Davide Perini ha scritto:<br>
<blockquote type="cite"
cite="mid:d559ff6c-8482-63ac-4611-926ad6c0f514@dpsoftware.org">
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Hi guys,<br>
I installed gstreamer in Ubuntu 20.04 as mentioned in the official
site:<br>
<p style="box-sizing: border-box; margin: 0px 0px 10px; color:
rgb(34, 34, 34); font-family: "Source Sans Pro",
"Source Sans", sans-serif; font-size: 14px;
font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: 2; text-align: left; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(238, 238, 238); text-decoration-style:
initial; text-decoration-color: initial;"><code
style="box-sizing: border-box; font-family: Menlo, Monaco,
Consolas, "Courier New", monospace; font-size:
12.6px; padding: 2px 4px; color: rgb(0, 0, 0);
background-color: rgb(248, 248, 248); border-radius: 0px;">apt-get
install libgstreamer1.0-0 gstreamer1.0-plugins-base
gstreamer1.0-plugins-good gstreamer1.0-plugins-bad
gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc
gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa
gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5
gstreamer1.0-pulseaudio</code></p>
<br>
when I try to screen capture:<br>
gst-launch-1.0 ximagesrc ! videoscale ! autovideosink<br>
<br>
I get an error.<br>
<br>
---<br>
root@sblantipodi-Virtual-Machine:~# gst-launch-1.0 ximagesrc !
videoscale ! autovideosink<br>
Setting pipeline to PAUSED ...<br>
error: XDG_RUNTIME_DIR not set in the environment.<br>
ERROR: Pipeline doesn't want to pause.<br>
ERROR: from element
/GstPipeline:pipeline0/GstXImageSrc:ximagesrc0: Could not open X
display for reading<br>
Additional debug info:<br>
gstximagesrc.c(158): gst_ximage_src_open_display ():
/GstPipeline:pipeline0/GstXImageSrc:ximagesrc0:<br>
NULL returned from getting xcontext<br>
Setting pipeline to NULL ...<br>
Freeing pipeline ...<br>
---<br>
<br>
Can you help me please?<br>
Same command works well on Fedora.<br>
<br>
Thank you!<br>
<br>
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</blockquote>
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