[Bug 783049] New: v4l2src: buffer starvation prevent pipeline to run as expected fps

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783049

            Bug ID: 783049
           Summary: v4l2src: buffer starvation prevent pipeline to run as
                    expected fps
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gdesmott at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

We are using this pipeline to test the performance on our hardware:

gst-launch-1.0 -v v4l2src device=/dev/video1 io-mode=4 !
video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! fpsdisplaysink
name=fpssink text-overlay=false video-sink=kmssink sync=true -v

The fps reported by the sink are around 20 fps instead of the 30 expected. This
seems to be because not enough buffers are allocated by v4l2src leading to a
starvation problem.

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