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H.264 is the long-standing standard in CCTV video compression, known for its balance between quality, file size, and compatibility. It works by dividing video frames into macroblocks (typically 16×16 pixels) and using inter-frame prediction to reduce redundant data across frames. This results in efficient compression without sacrificing too much image clarity. For most HD CCTV systems, H.264 remains a reliable choice due to its widespread support across recorders, cameras, and playback devices. It’s particularly useful in installations where hardware compatibility and ease of integration are priorities. While it doesn’t compress as aggressively as newer codecs, its stability and broad adoption make it ideal for legacy systems and general surveillance needs.
H.265 is the next-generation codec designed to handle higher-resolution CCTV footage with greater efficiency. It replaces macroblocks with Coding Tree Units (CTUs), which can be up to 64×64 pixels, allowing for more flexible and precise compression. This results in up to 50% smaller file sizes compared to H.264 at the same video quality — a major advantage for systems recording in 4K or storing large volumes of footage. H.265 also improves motion compensation and supports parallel processing, making it more efficient for modern surveillance environments. However, it requires more processing power and may not be supported by older hardware. For new installations focused on high-resolution imaging, long-term storage, or remote streaming over limited bandwidth, H.265 offers a future-proof solution.
