[Bug 791871] New: Video and sound are out of sync when it is written to file

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791871

            Bug ID: 791871
           Summary: Video and sound are out of sync when it is written to
                    file
    Classification: Platform
           Product: GStreamer
           Version: 1.4.4
                OS: other
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gen.kato at soft-net.co.jp
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I wrote video and sound to file with following command.

gst-launch-1.0 -v v4l2src ! video/x-raw,width=640,height=480,framerate=10/1 !
videorate ! clockoverlay ! omxh264enc ! mux. alsasrc device=plughw:1 !
audio/x-raw,rate=8000,channels=1,depth=16 ! queue ! audioresample !
audioconvert ! lamemp3enc  ! mux. avimux name=mux ! filesink
location=measure.avi


Video and sound are out of sync.
What is wrong?

Hardware : Raspberry pi (BCM2709 Revision:a22082)
OS: Raspbian GNU/Linux 8 (jessie)
Webcam: Logitech HD WEBCAM C270

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