<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> You will have to write a small python app for that, you should be able to find some tutorials on that. (fx <a class="moz-txt-link-freetext" href="https://lifestyletransfer.com/how-to-use-gstreamer-appsink-in-python/">https://lifestyletransfer.com/how-to-use-gstreamer-appsink-in-python/</a>) If your camera only provides YUYV, you will have to convert to BGR (opencv expects BGR). So something like: <pre class="wp-block-code" style="padding: 1.6em; margin: 0px 0px 1.6em; box-sizing: inherit; overflow: auto; font-family: "Courier 10 Pitch", Courier, monospace; font-size: 0.9375rem; background: rgb(238, 238, 238); line-height: 1.6; max-width: 100%; color: rgb(85, 85, 85); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><code style="padding: 0px; margin: 0px; box-sizing: inherit; font-family: Monaco, Consolas, "Andale Mono", "DejaVu Sans Mono", monospace; font-size: 0.9375rem;">"v4l2src ! videoconvert ! \ capsfilter caps=video/x-raw,format=BGR ! \ appsink emit-signals=True"</code></pre> Alternatively if you have gstreamer enabled in opencv you can do something like: <pre class="prettyprint" style="font-family: Menlo, Monaco, "Courier New", monospace; font-size: 12.025px; margin: 0px 0px 18px; background-color: rgb(245, 245, 245); padding: 2px; color: rgb(51, 51, 51); border-radius: 4px; display: block; line-height: 18px; border: 1px solid rgb(136, 136, 136); white-space: pre-wrap; word-break: break-all; overflow-wrap: break-word; clear: both; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><code style="font-family: Menlo, Monaco, "Courier New", monospace; font-size: 12px; padding: 0px; color: inherit; border-radius: 3px; background-color: transparent; border: 0px; clear: both;">cv2.VideoCapture('videotestsrc ! video/x-raw,framerate=20/1 ! videoscale ! videoconvert ! appsink', cv2.CAP_GSTREAMER)</code></pre> <a class="moz-txt-link-freetext" href="https://answers.opencv.org/question/202017/how-to-use-gstreamer-pipeline-in-opencv/">https://answers.opencv.org/question/202017/how-to-use-gstreamer-pipeline-in-opencv/</a> > But I have no idea how to make the pipe string that should go to the gst-launch-1.0 Google is your friend ;P Best Regards Marianna <div class="moz-cite-prefix">On 02.03.2023 13.00, <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel-request@lists.freedesktop.org">gstreamer-devel-request@lists.freedesktop.org</a> wrote: </div> <blockquote type="cite" cite="mid:mailman.41.1677758403.3270.gstreamer-devel@lists.freedesktop.org"> <pre class="moz-quote-pre" wrap="">Message: 3 Date: Thu, 2 Mar 2023 10:54:00 +0900 From: H Jumogehn <a class="moz-txt-link-rfc2396E" href="mailto:jumogehn@gmail.com" moz-do-not-send="true"><jumogehn@gmail.com></a> To: <a class="moz-txt-link-abbreviated moz-txt-link-freetext" href="mailto:gstreamer-devel@lists.freedesktop.org" moz-do-not-send="true">gstreamer-devel@lists.freedesktop.org</a> Subject: pipe string wanted Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:CAJp4miLc=p96bDn90HRWs3sb+36ZGvfz_ELXkm1MQOwOhwcjyg@mail.gmail.com" moz-do-not-send="true"><CAJp4miLc=p96bDn90HRWs3sb+36ZGvfz_ELXkm1MQOwOhwcjyg@mail.gmail.com></a> Content-Type: text/plain; charset="utf-8" Hello, I?d like to use gstreamer to capture video images(RGB/BGR), frames(RGB/BGR) from my V4L2 camera. The output of v4l2-ctl is shown below: $ vl42ctl -d /dev/video0 --all Driver Info (not using libv4l2): Driver name : basa Card type : FPD1-0103 Bus info : PCI:0000:09:00.0 Driver version: 5.4.143 Capabilities : 0x84200001 Video Capture Streaming Extended Pix Format Device Capabilities Device Caps : 0x04200001 Video Capture Streaming Extended Pix Format Priority: 2 Video input : 0 (FPD1-0103: ok) Format Video Capture: Width/Height : 1920/1080 Pixel Format : 'YUYV' Field : None Bytes per Line : 3840 Size Image : 4147232 But I have no idea how to make the pipe string that should go to the gst-launch-1.0 Could you suggest to me a good gstreamer pipe string for my camera? I?d like to use as much H/W accellerations as possible that the Nvidia RTX2080 provides. The source would be the camera above. The sink should be the appsink. But with the gst-launch-1.0 the sink can be fakesink. The application that receives data from the appsink must receive RGB or BGR data and upon this data opencv will be used and applied to process many vision algorithms. Thank you!</pre> </blockquote> <pre class="moz-signature" cols="72">-- Best regards / Med venlig hilsen “Marianna Smidth Buschle”</pre> </body> </html>