<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body bgcolor="#FFFFFF" text="#000000"> Hey, I'm not sure what framerate you are getting and what you are expecting, but I am going to assume because it is an RTP source, and they can be unreliable, porbably need to drop/duplicate frames. I would try to use the videorate element: <a class="moz-txt-link-freetext" href="https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-videorate.html">https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-videorate.html</a> It looks like it only accepts raw frames, so you might need to do a full transcode to duplicate frames. So I would try something like this (I put my changes in red): <pre wrap="">"gst-launch-1.0 rtspsrc do-timestamp=true is_live=true location=<a class="moz-txt-link-freetext" href="rtsp://admin:admin12345@192.168.1.64:554/h264/ch33/main/av_stream">rtsp://admin:admin12345@192.168.1.64:554/h264/ch33/main/av_stream</a> latency=0 ! tee name=t ! queue ! application/x-rtp, media=video,framerate=25,encoding-name=H264 ! rtph264depay ! decodebin ! videorate ! x264enc ! h264parse config-interval=1 ! matroskamux ! filesink location=\"test.mkv\" t. ! queue ! decodebin ! videoconvert ! xvimagesink" </pre> Hope that helps! Cheers, Michael. <div class="moz-cite-prefix">On 6/3/2017 12:59 AM, sulli_xue wrote: </div> <blockquote type="cite" cite="mid:1496476741853-4683188.post@n4.nabble.com"> <pre wrap="">Now I know how to save video file with correct framerate,the pipeline is as follow:"gst-launch-1.0 rtspsrc do-timestamp=true is_live=true location=<a class="moz-txt-link-freetext" href="rtsp://admin:admin12345@192.168.1.64:554/h264/ch33/main/av_stream">rtsp://admin:admin12345@192.168.1.64:554/h264/ch33/main/av_stream</a> latency=0 ! tee name=t ! queue ! application/x-rtp, media=video,framerate=25,encoding-name=H264 ! rtph264depay ! h264parse config-interval=1 ! matroskamux ! filesink location=\"test.mkv\" t. ! queue ! decodebin ! videoconvert ! xvimagesink" Just replace "mpegtmux" with "matroskamux" can get correct framerate number 25 by cvGetCaptureProperty(capture,CV_CAP_PROP_FPS).However cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_COUNT) still get wrong number and cvSetCaptureProperty(capture,CV_CAP_PROP_POS_FRAMES) cannot goto correct position.Could someone help me?Please~ -- View this message in context: <a class="moz-txt-link-freetext" href="http://gstreamer-devel.966125.n4.nabble.com/How-to-save-rtsp-video-stream-with-correct-framerate-tp4683176p4683188.html">http://gstreamer-devel.966125.n4.nabble.com/How-to-save-rtsp-video-stream-with-correct-framerate-tp4683176p4683188.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. _______________________________________________ gstreamer-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a class="moz-txt-link-freetext" href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </pre> </blockquote> </body> </html>