Realtime Video with Plot Overlay

[radix]

I am curious how feasible something like this would be using pyqtgraph...

Looks like the guy in this link is using Qt, OpenCV, and a webcam to process it all in real time at the C level. I would be happy being able to just post process this for my uses.

I am able overlay videos and static plots from PyQtGraph just fine and I can plot live data from data sources in PyQtGraph, but I am curious what the suggested way would be to merge the frames from OpenCV with the current display of PyQtGraph... I think exporting individual images from the API and merging them into the video could be a bit slow... Is there a better way?

Thanks

[Samuel Garcia]

If you want to grab image from webcam in python, you should try : https://mikeboers.github.io/PyAV/
It is very well documented yet but it is reallya good module for wrapping ffmep video stuff.
I prefer it over opencv.

Samuel

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[radix]

That looks interesting, I will check it out.

I was able to get an openCV image stream from a video to show up alongside my other running plots, but the quality was very degraded and the colors were all off or black and white. Also brought my computer to a crawl trying do it all at once (I doubt my is terribly effcient at this point).  I wasn't able to get the video to look like the original for whatever reason, seems like the data formats are somewhat different. But I was surprised I was able to get something close to what I was attempting to do.

Although maybe these tools are not the best to use for what I am trying to do. 

[radix]

I think my initial performance/colorizing problem stems from starting by trying to put a video into PyQtGraph and not PyQtGraph into a video. Are there any ideas on how to go about doing this using PyAV, OpenCV or others? Doing it with a webcam or or existing video is just fine for this...  I still have the problem of capturing an instance of the plot from PyQtGraph and overlaying it onto a video stream.