appsrc cause playback delay

[xxooyy]

I use the appsrc as src and use gst_app_src_push_buffer push h264 stream into
my pipeline, but I met following issue , I think the appsrc cause the buffer
transfer delay, can anyone help me , much appreciated for your help

appsrc ! video/x-h264, framerate=30/1, width=640, height=480 ! ffdec_h264 !
ffmpegcolorspace ! ximagesink sync=true =>* this will cause GstBaseSink
drops video data and not smooth*
    appsrc ! video/x-h264, framerate=30/1, width=640, height=480 !
ffdec_h264 ! ffmpegcolorspace ! ximagesink sync=false => *this will play
smooth , but plays about more than 1 min, it will special delay./b>

    gst-launch-0.10 -v filesrc location=dump_0.video ! video/x-h264,
framerate=30/1, width=640, height=480 ! ffdec_h264 ! ffmpegcolorspace !
ximagesink sync=true =>* this can be smooth and no delay*







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