Thank you for the answer. I've already add the capsfilter to fix the problem, but my app. should support many different types of sources, so I can't hard code the frame rate. Anyway, the videosink plays well with the decoder caps of framerate=100/1. I think it means videosink does not look at the caps to play the stream, but jpegenc or avimux does look at the framerate for recording. 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? Thank you in advance! Justin Is there anybody who can judge that this is a bug or not? <div class="gmail_quote">On Mon, Jul 20, 2009 at 2:48 AM, florian iragne <<a href="mailto:florian.iragne@viewsurf.com" target="_blank">florian.iragne@viewsurf.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 joh a écrit : <div><div></div><div>> Hi~ > > My application gets the mpeg4 video stream from a AXIS camera and > displays it on a x-window. Everything works perfectly. However, I have a > problem with recording the video to the file. The problem is that > ffdec_mpeg4 gets or sets (not sure who has set) wrong frame rate. The > sdp from rtspsrc said, the frame rate is 30/1 (sdp attribute belonged to > a media "a=framerate: 30.0"). However, the source pad of ffdec_mpeg4 has > frame rate of 100/1. So, When I record the stream and plays it, it runs > approximately three times faster than what it is suppoesed to do. > > I think either one of upstream elements, rtspsrc and rtpmp4vdepay, or > ffdec_mpeg4 is doing something wrong. Do you guys think it it a bug? > What's you think about it? </div></div>don't know whether it's a bug or not, but you should try to define caps with a capsfilter element like capsfilter caps="framerate=(fraction)30/1" Florian -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - <a href="http://enigmail.mozdev.org" target="_blank">http://enigmail.mozdev.org</a> iEYEARECAAYFAkpkPVIACgkQO8DE9K7b371s/QCgjgAYW97nD29v1auVhIQ+0XwW ZqUAoLCRsv8tnRYzzgLLMFoXXGt7jBN2 =Shzy -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: <a href="http://p.sf.net/sfu/Challenge" target="_blank">http://p.sf.net/sfu/Challenge</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net" target="_blank">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> </blockquote></div>