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Most, if not all, modern systems that deal with video (PCs, smartphones, cameras, etc, have a dedicated processor (graphics card) and/or instruction set to speed up encoding/decoding). Even the cheap point-and-shoot cameras have a video processor.

But Rasberry Pi is so cheap because, in part, it lacks any accelerator extensions. It does not even have the NEON SIMD extension. So, make sure you use the cheapest codec available for the platform.