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Date: Tue, 04 Mar 2014 08:03:01 -0700
From: Gary Thomas <gary@mlbassoc.com>
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Subject: [meta-fsl-arm] Using gstreamer on Nitrogen6x/SabreLite
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I have a SabreLite with the OV5642 camera.  I'd like to capture
some video and display it on the screen.  Here's my gstreamer
pipeline:

gst-launch -e -vvv mfw_v4lsrc device=/dev/video0 num-buffers=100 typefind=true \
   ! "video/x-raw-yuv, format=(fourcc)I420, width=640, height=480, framerate=(fraction)30/1" \
   ! ffmpegcolorspace \
   ! ximagesink

What I don't understand is why the format from mfw_v4lsrc has to
be I420 when the OV5642 [kernel] driver seems to only support YUYV
(yuyv422)?

To further confuse, I can grab a frame like this:
  yavta -fYUYV -s640x480 -F -c1 /dev/video0
and the V4l2 subsystem tells me this sensor is YUYV:
  root@nitrogen6x:~# v4l2-ctl -d /dev/video0 --list-formats
  ioctl: VIDIOC_ENUM_FMT
        Index       : 0
        Type        : Video Capture
        Pixel Format: 'YUYV'
        Name        :

Can someone explain this, please?

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------