Hi! I'm a newbie for gstreamer and working on a sink that I wish it would provide buffer for source. I think it would be a pull-based sink. The GStreamer I used is gstreamer-0.10.25, gst-plugin-base-0.10.25, and gst-plaugin-good-0.10.17. I implemented this sink based on base-sink, and added the virtual function: buffer_alloc() (gst_my_sink_buffer_alloc) and render() (gst_my_sink_render). After trying: GST_DEBUG=basesink:7,mysink:7 gst-launch fakesrc can-activate-pull=1 ! mysink I found gstbasesink.c had set DEFAULT_CAN_ACTIVATE_PULL to FALSE, so I set it to TRUE, and get the follow log. It seems pull mode is enabled, but gst_my_sink_buffer_alloc and gst_my_sink_render are not called. Does I make something wrong, or which sink can I use as reference? Besides fakesrc, is there any pull-source for me to do test with gst-launch? Thanks, France Hsu gst_my_sink_change_state: null to ready | gst_my_sink_start | gst_my_sink_change_state: ready to pause | gst_base_sink_pad_activate | gst_base_sink_negotiate_pull | gst_base_sink_pad_activate_pull | gst_base_sink_loop | gst_my_sink_change_state: pause to playing | [ gst_base_sink_loop: pulling 0, 4096 ]*