Checking support for clipping of input data

[Markus Elfring]

Hello,

I got informed that “Clipping” would be a general data processing operation.
https://en.wikipedia.org/wiki/Clipping_(computer_graphics)

Which GStreamer element implementations do you know which perform this kind of transformation
for selected multi-media input data?

Regards,
Markus
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[gotsring]

Have you looked at videocrop or videobox? I'm not quite sure what you're
trying to do.

https://gstreamer.freedesktop.org/documentation/videocrop/videocrop.html?gi-language=c
https://gstreamer.freedesktop.org/documentation/videobox/index.html?gi-language=c



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[Markus Elfring]

> https://gstreamer.freedesktop.org/documentation/videocrop/videocrop.html?gi-language=c
> https://gstreamer.freedesktop.org/documentation/videobox/index.html?gi-language=c

Thanks for your links.

My application interests can grow also for customised cropping of pictures.
This operation refers to rectangular areas.

I am looking for clipping support also for other shapes and exclusion of further
image parts.

Can the data processing results be represented as virtual cameras?

Regards,
Markus
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[gotsring]

I'm not aware of any stock GStreamer elements that allow you to mask off
other shapes. Worst case scenario, you can create a filter element or use
OpenCV to mask out parts of an image in whatever shape you want.

Assuming you're using Linux, you can use v4l2sink to pipe GStreamer video
outputs to a /dev/video device that can be used by other applications. You
just have to install a new video device beforehand.
https://gstreamer.freedesktop.org/documentation/video4linux2/v4l2sink.html?gi-language=c

See this post for more info:
http://gstreamer-devel.966125.n4.nabble.com/Error-using-v4l2sink-when-combining-2-camera-streams-td4696728.html



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[Markus Elfring]

> I'm not aware of any stock GStreamer elements that allow you to mask off
> other shapes.

Are any other drawing programs needed for the construction of clipping areas?

Will software development interests grow for such an use case?

Regards,
Markus
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