Additional features for vedc validate

[KamranBinaee]

I added the first commit to the validate_command branch just to start the conversation on how we'd want this to be implemented. Some topics to discuss and implementation questions that I was not sure:

• How do we want to inform the user whether it failed or it was successful. Since it also runs the calibration, the results are printed out. Is that enough?
• Do we want to generate a beep for calibration failure? Or if the covered area is not wide enough?
• Since we don't have matplotlib installed in vedc environment and validate code generates the coverage plot, would that be needed to be added to the requirements.txt? Not sure!
• Where would be the directory to save the plots? If we decide to save it. Or we'd just want to call plt.show() the latter might mess with the timer though. Not sure!

[KamranBinaee]

Testing whether I can ping users here to make sure you guys can see the comments. @phausamann @marklescroart

[phausamann]

@marklescroart @KamranBinaee

My takes on this are:

1. Could be nice to generate a "validation report" that prominently highlights when the calibration failed.
2. I believe the experimenter needs to visually inspect the validation results anyway, so I don't think audio feedback is necessary.
3. Yes, you need to add the matplotlib dependency to environment.devenv.yml and pin it to a reasonable version (whatever you have currently installed in your env should be fine).
4. I'm still not 100% clear about the exact validation procedure. Do we want to record the streams during the validation? If yes, we can just save the report to the recording folder.

[phausamann]

One important step is also to check that the actual FPS for each stream match the configuration.

[phausamann]

Copied from #18:

We should probably add a recording verification, either as a step at the end of the recording, or as a separate command that checks these things for all streams, e.g.:

• Matching timebases
• Similar start and end times
• Frame rates matching specification in config file
• No frame drops or jitter in timestamps