Hi,<br> <br> You cannot directly use payloader over a mp4 file. A mp4 file contains, other than the raw video data, meta information in a format prescribed in ISO/IEC-14496 (parts 12 and 14); so you need to have a mp4 file parser that can extract the elementary streams and feed to the payloader. I do not know if there is a mp4 parser plugin in gstreamer, but there is a avi parser. So if you have a avi file you can use avidemux or ffdemux_avi for the purpose. Otherwise, use some other tool like mp4creator or gpac to extract the elementary streams offline from your mp4 file and feed to the payloader.<br> <br> Wim/other gst developers, please correct me if I'm wrong.<br> <br> Regards,<br> Deeptendu<br><br><div><span class="gmail_quote">On 9/4/06, <b class="gmail_sendername">Fu Hao</b> <<a href="mailto:fu585@oki.com">fu585@oki.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div> <div bgcolor="#ffffff"> <div><font face="MS UI Gothic" size="2">Hello, Everyone!</font></div> <div><font face="MS UI Gothic" size="2">    </font></div> <div><font face="MS UI Gothic" size="2">    I'm a freshman here.</font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">    Recently I have a problem about 'filesrc' element and rtpXXXpay element.</font></div> <div> </div> <div><font face="MS UI Gothic" size="2">    When I use this command: </font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">        gst-launch </font> <font face="MS UI Gothic" size="2">videotestsrc ! ffenc_mpeg4 ! rtpmp4vpay ! rtpmp4vdepay ! ffdec_mpeg4 ! xvimagesink</font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">    I can see the video image, and all is OK. </font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">    Then, I want to change the 'videotestsrc' to 'filesrc',  and set the 'location' of 'filesrc' as a '*.mp4'.</font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">    The command looks like this:</font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">        gst-launch filesrc location=/home/Dell.mp4 ! rtpmp4vpay ! rtpmp4vdepay ! ffdec_mpeg4 ! xvimagesink</font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">    The Error is :  "subclass did not specify clock_rate."</font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">    I do not know where is wrong. Can you help me ?</font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">    Thanks !</font></div> <div><font face="MS UI Gothic" size="2"></font> </div> <div><font face="MS UI Gothic" size="2">  <br> </font></div></div></div> <div style="text-align: left;"><br> </div> </blockquote></div><br>