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Duplicate images using GSCAM

asked 2011-07-28 00:05:50 -0600

Charence gravatar image


I am trying to use GSCAM to capture video from a composite video input through a ViewCast Osprey 230 analogue video capture card.

I have set GSCAM_CONFIG to:

GSCAM_CONFIG="v4l2src device=/dev/video0 ! video/x-raw-rgb ! ffmpegcolorspace"

And viewing the video through image_view

rosrun image_view image_view image:=/gscam/image_view

The problem is the image is duplicated. I only get this problem running when using gscam and the capture card, a USB webcam I have tested works fine. I presume that I need to alter GSCAM_CONFIG but I have not been able to find the correct configuration yet.

Screenshot of my problem: Duplicate images

Any help would be much appreciated!


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when i give rosrun image_view image_view image:=/gscam/image_view, i'm getting only empty window without video. how to proceed further?

nandhini gravatar image nandhini  ( 2012-03-26 02:30:45 -0600 )edit

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answered 2011-07-28 05:29:56 -0600

Charence gravatar image

After some more searching, I believe I need to perform some kind of interlacing to alternate between the images from the top field and bottom field. Haven't figured out how to do that yet..

Meanwhile, I have resorted to cropping and resizing. I'm sure this is wrong, but I'm doing this until I figure out how to interlace the video.

GSCAM_CONFIG="v4l2src device=/dev/video0 ! videocrop top=0 left=0 right=0 bottom=288 ! videoscale ! video/x-raw-yuv,width=720,height=576 ! ffmpegcolorspace"
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This page has some more info:
Charence gravatar image Charence  ( 2011-07-29 01:35:04 -0600 )edit

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Asked: 2011-07-28 00:05:50 -0600

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Last updated: Jul 28 '11