Put an AV test at the start of your slides

For years, I've had a test-card at the start of my slides. Before I start my talk, I can immediately see if the aspect ratio is wrong, colours are off, or any other visual issues with the presentation. A few years ago I was invited to give a talk and was assured that the venue was set up for audio as well as video. I dutifully filled my slides with with demo videos containing sound. None of…

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