iOS VideoToolbox硬编H.265（HEVC）H.264（AVC）：1 概述

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iOS VideoToolbox硬编H.265（HEVC）H.264（AVC）：2 H264数据写入文件

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iOS Video Toolbox：读写解码回调函数CVImageBufferRef的YUV图像

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iOS VideoToolbox硬编H.265（HEVC）H.264（AVC）：4 同步编码

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