Hi Amout, Thank you for your answer! I've just looked at the debug messages, and found what you mentioned. Below are the part of log. By the way, can you explain how I can watch the video in normal speed? Does it mean that ffmpeg duplciates frames to satisfy the frame rate what it belives? Regards, Justin ------------------------------------------------------------------------------------------- gstffmpegdec.c:714:gst_ffmpegdec_setcaps:<ffdec_mpeg40> forcing 25/1 framerate gstffmpegdec.c:744:gst_ffmpegdec_setcaps:<ffdec_mpeg40> Using framerate from codec . . ffmpeg gstffmpegdec.c:1130:gst_ffmpegdec_negotiate:<ffdec_mpeg40> Renegotiating video from 0x0@ -1/-1 fps to 640x480@ -1/0 fps ffmpeg gstffmpegcodecmap.c:1724:gst_ffmpeg_codectype_to_video_caps: context:0x9c81c00, codec_id:13, encode:0, codec:(nil) ffmpeg gstffmpegcodecmap.c:186:gst_ff_vid_caps_new: context:0x9c81c00, codec_id:13, mimetype:video/x-raw-yuv gstffmpegcodecmap.c:1602:gst_ffmpeg_pixfmt_to_caps: caps for pix_fmt=0: video/x-raw-yuv, width=(int)640, height=(int)480, framerate=(fraction)100/1, format=(fourcc)I420 ------------------------------------------------------------------------------------------- <div class="gmail_quote">On Wed, Jul 22, 2009 at 1:12 AM, Arnout Vandecappelle <<a href="mailto:arnout@mind.be">arnout@mind.be</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="im">On Monday 20 July 2009 18:11:26 joh wrote: > I've investigated source code, but I coudn't find where the 100/1 came > from. The truth is that rtspsrc doesn't even care about "a=framerate..." > field to create cap, and it seems like not a mandatory attribute. > > Anybody can tell me what how mp4vdepay or ffdec_mpeg4 sets frame rate? </div> I think it's the framerate that is set by the MPEG4 stream itself. Try running with --gst-debug=ffmpeg:5 and look for 'Using framerate from codec'. If that is there, it means the MPEG4 stream specifies a framerate of 100fps. I had something similar with Sony's MPEG4 cameras. It would surprise me that Axis does things the wrong way, but it is possible I guess... Regards, Arnout -- Arnout Vandecappelle arnout at mind be Senior Embedded Software Architect +32-16-286540 Essensium/Mind <a href="http://www.mind.be" target="_blank">http://www.mind.be</a> G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven LinkedIn profile: <a href="http://www.linkedin.com/in/arnoutvandecappelle" target="_blank">http://www.linkedin.com/in/arnoutvandecappelle</a> GPG fingerprint: D206 D44B 5155 DF98 550D 3F2A 2213 88AA A1C7 C933 ------------------------------------------------------------------------------ <div><div></div><div class="h5">_______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </div></div></blockquote></div>