<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <style type="text/css" style="display:none;"></style> </head> <body dir="ltr"> <div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif;" dir="ltr"> hi all, I'm writing my own video plugin, which should support 2 types of input video format (I420, UYVY). The initialization (internal memory allocation, configuration, etc...) for these 2 types of format are seperated, so need to be told by a format parameter from caps negotiation with upstream element. Now my question is: when does the caps negotiation take place? So that I can place my internal initialization after it. At first I put my init function intuitively in the state change function, to be precise, the READY TO PAUSED transition part. Then I found that caps negotiation finishes much later than READY-TO-PAUSED transition, even later than the PAUSED-TO-PLAYING transition. BTW, when I say "caps negotiation finishes", I mean when my element get the GST_EVENT_CAPS. Any help would be much appreciated. Thanks, Xin </div> </body> </html>