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grid-overlay using gstreamer

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ramanadh ravinuthala

grid-overlay using gstreamer

Hello,
i want the grid-overlay to be displayed on the gstreamer video which will divide the video into blocks of some size
is there any plugin available
Thanks

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Praveen Pandey

Re: grid-overlay using gstreamer

you can use 'videomixer'
This is a part of 'gst-plugins-good' package

BR,
Praveen
________________________________________
From: ramanadh ravinuthala [[hidden email]]
Sent: Wednesday, August 18, 2010 3:50 PM
To: [hidden email]
Subject: [gst-devel] grid-overlay using gstreamer

Hello,
i want the grid-overlay to be displayed on the gstreamer video which will divide the video into blocks of some size
is there any plugin available
Thanks

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ramanadh ravinuthala

Re: grid-overlay using gstreamer

In reply to this post by ramanadh ravinuthala

Hi,
the videomixer doesn't have any property like block size or the number of blocks.
actually i need a overlay on the video which divides the frame into blocks of some fixed size
can you please provide any example pipe line
Thanks

Bert Douglas

Re: grid-overlay using gstreamer

The idea is that you make an image with desired grid pattern. There are many ways to do this.
You can generate the image either "off line" and fetch it from a file.
Or you can generate the image "on line" directly in memory.

You can do this "by hand" using an image editor. This may be tedious and error prone.

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.

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.

Or you can use the cairo calls to generate an image.

Once you have the image, you get get it from a file using "file source" and "image decoder".

Google pulls up lots of hits on this topic.
http://gstreamer-devel.966125.n4.nabble.com/Overlaying-an-image-on-a-live-stream-td1745726.html

Bert Douglas

--Bert

On Wed, Aug 18, 2010 at 1:04 PM, ramanadh ravinuthala <[hidden email]> wrote:

Hi,
the videomixer doesn't have any property like block size or the number of blocks.
actually i need a overlay on the video which divides the frame into blocks of some fixed size
can you please provide any example pipe line
Thanks

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Nitin Das

Re: grid-overlay using gstreamer

I think you can use the videotestsrc having pattern=

(7): checkers-1 - Checkers 1px

(8): checkers-2 - Checkers 2px

(9): checkers-4 - Checkers 4px

(10): checkers-8 - Checkers 8px

and overlayed on your gstreamer video using videomixer with some transparency level.

--nitin

On Thu, Aug 19, 2010 at 2:31 AM, Bert Douglas <[hidden email]> wrote:

The idea is that you make an image with desired grid pattern. There are many ways to do this.
You can generate the image either "off line" and fetch it from a file.
Or you can generate the image "on line" directly in memory.

You can do this "by hand" using an image editor. This may be tedious and error prone.

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.

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.

Or you can use the cairo calls to generate an image.

Once you have the image, you get get it from a file using "file source" and "image decoder".

Google pulls up lots of hits on this topic.
http://gstreamer-devel.966125.n4.nabble.com/Overlaying-an-image-on-a-live-stream-td1745726.html

Bert Douglas

--Bert

On Wed, Aug 18, 2010 at 1:04 PM, ramanadh ravinuthala <[hidden email]> wrote:

Hi,
the videomixer doesn't have any property like block size or the number of blocks.
actually i need a overlay on the video which divides the frame into blocks of some fixed size
can you please provide any example pipe line
Thanks

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Olivier Aubert-2

Re: grid-overlay using gstreamer

In reply to this post by Bert Douglas

On Wed, 2010-08-18 at 16:01 -0500, Bert Douglas wrote:
> The idea is that you make an image with desired grid pattern. There
> are many ways to do this.
> You can generate the image either "off line" and fetch it from a file.
> Or you can generate the image "on line" directly in memory.

> 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.
Another option is to generate SVG (which in this case is much simpler
than generating ppm), and use the (not integrated yet) rsvgoverlay
element - see https://bugzilla.gnome.org/show_bug.cgi?id=435120

Olivier

> 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.
>
> Or you can use the cairo calls to generate an image.
>
> Once you have the image, you get get it from a file using "file
> source" and "image decoder".
>
> Google pulls up lots of hits on this topic.
> http://gstreamer-devel.966125.n4.nabble.com/Overlaying-an-image-on-a-live-stream-td1745726.html
>
> Bert Douglas
>
>
>
>
>
>
>
>
>
>
>
> --Bert
>
> On Wed, Aug 18, 2010 at 1:04 PM, ramanadh ravinuthala
> <[hidden email]> wrote:
> Hi,
> the videomixer doesn't have any property like block size or
> the number of blocks.
> actually i need a overlay on the video which divides the frame
> into blocks of some fixed size
> can you please provide any example pipe line
> Thanks
>
>
>
>
> ------------------------------------------------------------------------------
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>
> Make an app they can't live without
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>
>
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>
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