Hi there, I try to write a little program in C that handles rtsp streams with gst and I have some troubles. I create a pipeline like this one : rtspsrc ! decodebin ! fakesink In documentation rtspsrc have "sometimes" pad and should provide data only when in PLAYING state, so I added an callback to "pad-added" signal and set state of my pipeline to PLAYING. My "pad-added" signal is called, and in this callback I link rtspsrc pad with sink pad of decodebin element. Decodebin have signals for "new-decoded-pad" so I provide a callback for this signal too. Callback is called and I detect caps. But here troubles comes. Caps are not always the same. Sometimes I receive fixed caps with only one height, width, framerate and fourcc values , and sometimes i received ranges for these values. I woul like to know how to do to always receive right and fixed values in decodebin caps ? "new-decoded-pad" callback have "last" boolean, in his prototype, sould this value is 1 when they are no more pad for decodebin element ? In my test this boolean vallue is always FALSE. My stream have audio and video. attached my source code. If you have ideas ... :) Best regards, Nicolas