Video Formats and Codecs

Number of frames per second (FPS) commonly used for compression/decompression speed measurement.

The following issues should be considered when estimating probable codec performance differences:

    Decompression (sometimes compression) frame time uniformity. Big differences in this value can cause annoyingly jerky playback.
    SIMD support by processor and codec — e.g., MMX, SSE, SSE2, each of which change CPU performance on some kinds of tasks (often including those with which codecs are concerned).
    Multi-threading support by processor and codec (sometimes turning on Hyper-threading support (if available on a particular CPU) causes codec speed to decrease)
    RAM speed (generally important for most codec implementations)
    Processor cache size (low values sometimes cause serious speed degradation, e.g. for CPUs with low cache such as several of the Intel Celeron series.)
    GPU usage by codec — some codecs can drastically increase their performance by taking advantage of GPU resources.

So, for example, codec A (being optimized for memory usage – i.e., uses less memory) may, on modern computers (which are typically not memory-limited), give slower performance than codec B. Meanwhile, the same pair of codecs may give opposite results if running on an older computer with reduced memory (or cache) resources.
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