For stage 0, it work fine. 1. When receive segment done after stage 0, I send a eos event to qtdemux sink pad, and block in queue sink pad, then unlink h264dec and queue, and change the pipeline to stage1, then do segment seek for demux_bg and demux_fga and set the pad offset -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/