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Image Freeze

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Thierry Panthier

Image Freeze

Hi,

I'm developing an application that uses GStreamer to play video streams using RTSP.

The RTSP server is an off-the-shelf board that streams MJPEG video from analogue cameras.

If a camera is unplugged this board streams a still blue image. And I need to be able to detect it.

I found out a plugin called imagefreeze that creates a stream from an image file. But what I want is a plugin that detects a frozen video stream.

Would anyone know a plugin with similar functionality? Is anyone developing something similar?

Thanks in advance,

Thierry

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Michael Joachimiak

Re: Image Freeze

I think what you describe is not a frozen image but a way to inform the receiver that smth is wrong with the input.

The image is streamed so the data comes in all the time. The only way is to detect a blue screen by analysis of the image ( histogram maybe)

If you expect a ready plugin for detection a blue image I doubt there is smth like that.

Maybe frei0r-filter-g (-r,-b) would help. But I don't have any experience with that.
BR

2010/10/13 Thierry Panthier <[hidden email]>

Hi,

I'm developing an application that uses GStreamer to play video streams using RTSP.

The RTSP server is an off-the-shelf board that streams MJPEG video from analogue cameras.

If a camera is unplugged this board streams a still blue image. And I need to be able to detect it.

I found out a plugin called imagefreeze that creates a stream from an image file. But what I want is a plugin that detects a frozen video stream.

Would anyone know a plugin with similar functionality? Is anyone developing something similar?

Thanks in advance,

Thierry

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--
Your Sincerely
Michael Joachimiak

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Robert Swain-2

Re: Image Freeze

On 13 October 2010 09:25, Michael Joachimiak <[hidden email]> wrote:
> I think what you describe is not a frozen image but a way to inform the
> receiver that smth is wrong with the input.
> The image is streamed so the data comes in all the time. The only way is to
> detect a blue screen by analysis of the image ( histogram maybe)
> If you expect a ready plugin for detection a blue image I doubt there is
> smth like that.
> Maybe frei0r-filter-g (-r,-b) would help. But I don't have any experience
> with that.

It should be quite simple to write an element that diffs (using some
metric) one frame against a past frame and emit an event if that is
the case. I don't know of such an element personally, but my
familiarity with the available elements isn't so good.

Regards,
Rob

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Thierry Panthier

Re: Image Freeze

Yep... that's probably what we're going to do. We need an alarm to let the application know there's something wrong with the video stream. Simple as that, but apparently not available.

Thanks for your help!

And when (and if) this plugin is ready, I'll publish it :)

Regards,

- Thierry

On Wed, Oct 13, 2010 at 6:41 PM, Rob <[hidden email]> wrote:

On 13 October 2010 09:25, Michael Joachimiak <[hidden email]> wrote:
> I think what you describe is not a frozen image but a way to inform the
> receiver that smth is wrong with the input.
> The image is streamed so the data comes in all the time. The only way is to
> detect a blue screen by analysis of the image ( histogram maybe)
> If you expect a ready plugin for detection a blue image I doubt there is
> smth like that.
> Maybe frei0r-filter-g (-r,-b) would help. But I don't have any experience
> with that.

It should be quite simple to write an element that diffs (using some
metric) one frame against a past frame and emit an event if that is
the case. I don't know of such an element personally, but my
familiarity with the available elements isn't so good.

Regards,
Rob

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