<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> Try adding --gst-debug=*:3 to the failing command line. If you are getting a non-negotiated error then it is because your source doesn't support a fps of 25. Fx my webcam only supports 10/1: msb@QTEC-P53-MSB-Debian:~/QtecGit/python-tests$ gst-launch-1.0 v4l2src ! video/x-raw, framerate=5/1 ! fakesink --gst-debug=*:3 PAUSERER rørledning ... Rørledningen kører, og behøver ikke at blive PREROLL'ed ... Rørledningen er PREROLL'ed ... Rørledning sættes til AFSPIL ... New clock: GstSystemClock 0:00:00.132050019 18347 0x55e8e83d6f00 WARN basesrc gstbasesrc.c:3127:gst_base_src_loop:<v4l2src0> error: Internal data stream error. 0:00:00.132109933 18347 0x55e8e83d6f00 WARN basesrc gstbasesrc.c:3127:gst_base_src_loop:<v4l2src0> error: streaming stopped, reason not-negotiated (-4) FEJL: fra element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data stream error. Yderligere fejlsøgningsinformation: ../libs/gst/base/gstbasesrc.c(3127): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: streaming stopped, reason not-negotiated (-4) Execution ended after 0:00:00.000560010 Rørledning sættes til NUL ... Rørledning frigøres ... If you install v4l-utils you can use: v4l2-ctl -d <videodev> --all And it will tell you what it supports: Video input : 0 (Camera 1: ok) Format Video Capture: Width/Height : 1280/720 Pixel Format : 'YUYV' (YUYV 4:2:2) Field : None Bytes per Line : 2560 Size Image : 1843200 Colorspace : sRGB Transfer Function : Default (maps to sRGB) YCbCr/HSV Encoding: Default (maps to ITU-R 601) Quantization : Default (maps to Limited Range) Flags : Crop Capability Video Capture: Bounds : Left 0, Top 0, Width 1280, Height 720 Default : Left 0, Top 0, Width 1280, Height 720 Pixel Aspect: 1/1 Selection Video Capture: crop_default, Left 0, Top 0, Width 1280, Height 720, Flags: Selection Video Capture: crop_bounds, Left 0, Top 0, Width 1280, Height 720, Flags: Streaming Parameters Video Capture: Capabilities : timeperframe Frames per second: 10.000 (10/1) Best Regards Marianna <blockquote type="cite" cite="mid:mailman.141.1633947441.911.gstreamer-devel@lists.freedesktop.org"> <pre class="moz-quote-pre" wrap="">Hi I have a question on frame rate on gstreamer in coding. I have set a caps filter after the video src (v4l2src) A code snippet GstCaps *caps; caps = gst_caps_new_simple("video/x-raw", "width", G_TYPE_INT, 640, "height", G_TYPE_INT, 480, "framerate", GST_TYPE_FRACTION, 30, 1, "is-live", G_TYPE_BOOLEAN, TRUE, NULL); if((gst_element_link_filtered(src, caps))!=TRUE) { g_print(" Could not link pipeline\n"); gst_object_unref (GST_OBJECT (pipeline)); return 0; } I have 3 branches to the source (1) Display (2) Records (3) sending video elsewhere. But it is only at caps, I define the size of video and the frame rate to collect Video play smoothly. However when I changed to a lower value of framerate to 25, the video refuse to play. I wonder why? isnt the lower framerate would have lesser stress on the system resource A little other experiment that I have done using command line: Pipeline play </pre> <blockquote type="cite" style="color: #007cff;"> <blockquote type="cite" style="color: #007cff;"> <pre class="moz-quote-pre" wrap="">gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, width=640, height=480, framerate=30/1 ! videoconvert ! autovideosink </pre> </blockquote> </blockquote> <pre class="moz-quote-pre" wrap="">Pipeline do not play </pre> <blockquote type="cite" style="color: #007cff;"> <blockquote type="cite" style="color: #007cff;"> <pre class="moz-quote-pre" wrap="">gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw, width=640, height=480, framerate=25/1 ! videoconvert ! autovideosink </pre> </blockquote> </blockquote> <pre class="moz-quote-pre" wrap="">Would like suggestion on what to do next Thanks</pre> </blockquote> <pre class="moz-signature" cols="72">-- Best regards / Med venlig hilsen “Marianna Smidth Buschle”</pre> </body> </html>