[gst-devel] Why does my pipeline block on preroll?

[wl2776]

I have the pipeline:

filesrc ! typefind ! mpegpsdemux name=demux multiqueue
max-size-bytes=2097152 name=mq demux.audio_c0 ! mq.sink0 mq.src0 ! mp3parse
! flump3dec ! input-selector ! tee ! audioconvert ! audioresample !
pulsesink  demux.video_e0 ! mq.sink1 mq.src1 ! mpegvideoparse ! mpeg2dec !
input-selector ! queue max-size-buffers=3 max-size-bytes=0 max-size-time=0 !
ffmpegcolorspace ! videoscale ! xvimagesink


Here is the dot file: 
http://gstreamer-devel.966125.n4.nabble.com/file/n2297314/player.dot
player.dot  (30kb), and produced PNG: 
http://gstreamer-devel.966125.n4.nabble.com/file/n2297314/player.png
player.png  (850kb)

Looks like there is no negotiation between multiqueue and mpegvideoparse.
Why an it be?

I tried using seek example with this pipeline
($GST_PLUGINS_BASE/test/examples/seek/seek.c)
It begins playing only after seek command.
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