Well, that's not really the issue, "dropping frames" usually refers to connection issues, whereby the frame rate goes to 10 fps or such for really short periods. So people don't see some of the frames and the video starts breaking up. And even though on average the frame rate may only go down by 40, some frames will be lost completely, making it very annoying and hard to watch. It's like packet loss, essentially.
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But if that's not what you meant, the example is valid.
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But if that's not what you meant, the example is valid.