Yes,I configure the "format" of my appsrc as GST_FORMAT_TIME. And "stream-type" as 0;"is-live" as TRUE;"do-timestamp" as TRUE; "min-latency" as 0; "max-byte" as FRAME_H*FRAME_W*3/2*100; "block" as TRUE; "min-percent" as 50. -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/