I think you can use the videotestsrc having pattern= <br><div> (7): checkers-1 - Checkers 1px</div><div> (8): checkers-2 - Checkers 2px</div><div> (9): checkers-4 - Checkers 4px</div>
<div> (10): checkers-8 - Checkers 8px</div><div><br></div><div>and overlayed on your gstreamer video using videomixer with some transparency level.</div><div><br></div><div>--nitin</div><div>
<br></div><div class="gmail_quote">On Thu, Aug 19, 2010 at 2:31 AM, Bert Douglas <span dir="ltr"><<a href="mailto:bertd@tplogic.com">bertd@tplogic.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
The idea is that you make an image with desired grid pattern. There are many ways to do this.<br>You can generate the image either "off line" and fetch it from a file.<br>Or you can generate the image "on line" directly in memory.<br>
<br>You can do this "by hand" using an image editor. This may be tedious and error prone.<br><br>Or you can write a separate script in your favorite language (python,ruby,perl, etc) to write a ppm file. That is easiest format to produce, without using any libraries. Then convert to acceptable image file format (png, jpeg) using image editor.<br>
<br>Or you can write a program that generates postscript in a text file, and process that using linux command line tools into an image file. This is probably the best combination of power and simplicity, if you need something more than just straight vertical and horizontal black lines. But it may be somewhat difficult to get exact pixel positions.<br>
<br>Or you can use the cairo calls to generate an image.<br><br>Once you have the image, you get get it from a file using "file source" and "image decoder".<br><br>Google pulls up lots of hits on this topic.<br>
<a href="http://gstreamer-devel.966125.n4.nabble.com/Overlaying-an-image-on-a-live-stream-td1745726.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Overlaying-an-image-on-a-live-stream-td1745726.html</a><br>
<br>Bert Douglas<br><font color="#888888">
<br><br><br><br><br><br><br><br><br><br><br>--Bert<br><br></font><div class="gmail_quote"><div><div></div><div class="h5">On Wed, Aug 18, 2010 at 1:04 PM, ramanadh ravinuthala <span dir="ltr"><<a href="mailto:ramnadh_india@yahoo.co.in" target="_blank">ramnadh_india@yahoo.co.in</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex"><div><div></div><div class="h5"><table border="0" cellpadding="0" cellspacing="0"><tbody><tr>
<td style="font:inherit" valign="top">
Hi,<br>the videomixer doesn't have any property like block size or the number of blocks.<br>actually i need a overlay on the video which divides the frame into blocks of some fixed size<br>can you please provide any example pipe line<br>
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