FFmpeg：‘UINT64_C‘ was not declared in ths scope

这个错误的出现还会伴随着下面这个错误：

error: #error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS
#error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS解决的办法是在libavuti\common.h开头处加入

#ifndef UINT64_C
#define UINT64_C(c) (c ## ULL)
#endif

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FFmpeg：‘UINT64_C‘ was not declared in ths scope

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