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Depends on the implementation. FFmpeg's decoders for H264/HEVC typically use only frame threads in the default configuration, the exact number depends on the number of cores on your system. OpenHEVC allows you to combine frame and wave-front threading (similar to x265). Frame+Tile - like Frame+WFP - allows better scaling at ultra-high resolutions or very low-end systems, but is not typically necessary for real-time playback on normal systems.
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