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This error occurs because the user has a corrupted codec installed on one of his devices.
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Video File Cannot Be Played (Error 102630) Why this happens is not something that can be answered in a single sentence, so listed out below is a detailed explanation of these problems which users like you may have experienced at one time or another.
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These errors disrupt video playback or even outright prevent the videos from playing. Mozilla Firefox is a very utilitarian web browser but users around the world have attested to how errors can plaque it. Part 1: Different Errors Showing Firefox Won't Play Videos
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