Change camera example to add a time stamp to recorded video

[RichS71]

Hi All,

I'd like to adapt the camera example in 5.11.1 so that it adds a time/date stamp overlay into the video stream , much the same as you would get on a cctv system.

Can anyone give me an idea of how I could approach this. I'm a Qt nube but an old hat at C++.

Thanks in advance

Rich

[SGaist]

Hi,

What OS are you working on ?

[RichS71]

Hi SGaist,

I'm using Linux Mint 18.1 and ubuntu 16.04.

[SGaist]

You can use QAbstractVideoFilter and add the time stamp on each image.

Or alternatively, you can exploit GStreamer's qmlsink. This would require you to build a GStreamer pipeline that would do the time-stamping.

[RichS71]

That's great I'll give that a go and update this thread accordingly.
Thanks for your help.

[RichS71]

I've read around using QAbstractVideoFilter but all the examples I'm finding seem to require QML . Is there a way to add the filter using C++ avoiding the QML route?

[Pablo J. Rogina]

@RichS71 said in Change camera example to add a time stamp to recorded video:

QAbstractVideoFilter

You may want to check this post and this blog just in case.

[RichS71]

Thanks . The post link you included I'd not seen before and appeared to conclude that no one has succeeded in converting the non QML camera example to use filters.

I guess the bit I can't work out is how to connect the filter to the pipeline of QCamera using C++.
I shall persist .