<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-15"> </head> <body> Hi guys, I installed gstreamer in Ubuntu 20.04 as mentioned in the official site: <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> when I try to screen capture: gst-launch-1.0 ximagesrc ! videoscale ! autovideosink I get an error. --- root@sblantipodi-Virtual-Machine:~# gst-launch-1.0 ximagesrc ! videoscale ! autovideosink Setting pipeline to PAUSED ... error: XDG_RUNTIME_DIR not set in the environment. ERROR: Pipeline doesn't want to pause. ERROR: from element /GstPipeline:pipeline0/GstXImageSrc:ximagesrc0: Could not open X display for reading Additional debug info: gstximagesrc.c(158): gst_ximage_src_open_display (): /GstPipeline:pipeline0/GstXImageSrc:ximagesrc0: NULL returned from getting xcontext Setting pipeline to NULL ... Freeing pipeline ... --- Can you help me please? Same command works well on Fedora. Thank you! </body> </html>