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Adding a workaround on MacOS to bypass issue of undetected video feed

All frames returned from the video sink on MacOS have an invalid presentation time despite everything else being valid. Not clear on why, possibly a QT bug or there's some mac-specific configuration that's missing.
The program thinks the video feed is not working when it actually is due to this and removing the check for duplicate frames gets around this. Not the best solution but the workaround is functional.