<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>Hi,</span></div><div><br><span></span></div><div><span>I want to set caps dynamically at the src of a transform element derived from  base transform element. It seems a static caps must be set at the base init function.I tried to replace the caps with gst_caps_replace() in fixate_caps function, but it is not successful. Where is it the best place to do it?<br> </span></div><div> Thanks,</div><div><br></div><div style="color:rgb(26, 26, 26);font-size:13px;font-family:arial, helvetica, clean, sans-serif;background-color:transparent;font-style:normal;">Kind Regards<br></div><div style="color:rgb(26, 26, 26);font-size:13px;font-family:arial, helvetica, clean, sans-serif;background-color:transparent;font-style:normal;"><br>Kaijun Tang</div></div></body></html>