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fmpeg 默认是用C文件来编译的，如果某个CPP文件想引用ffmpeg中的某些函数或者头文件，有可能出现

‘UINT64_C’ was not declared in this scope的错误

情形大概如下

The same issue i'm getting here when compiling chromium with ffmpeg from svn:

In file included from /usr/include/libavutil/avutil.h:81:0,

from /usr/include/libavcodec/avcodec.h:30,                

 from out/Release/obj.target/geni/ffmpeg_stubs.cc:16:

/usr/include/libavutil/common.h: In function 'int32_t av_clipl_int32(int64_t)':

/usr/include/libavutil/common.h:154:47: error: 'UINT64_C' was not declared in this scope

make: *** [out/Release/obj.target/geni/ffmpeg_stubs.o] Error 1

可以 在cpp文件中加入

extern "C"{

#ifdef __cplusplus

 #define __STDC_CONSTANT_MACROS #ifdef _STDINT_H  #undef _STDINT_H #endif # include <stdint.h>#endif

}

或者

/usr/local/include/libavutil/common.h: In function ‘int32_t av_clipl_int32_c(int64_t)’:

/usr/local/include/libavutil/common.h:170: error: ‘UINT64_C’ was not declared in this scope

这个问题可以这么解决

编辑文件  gedit /usr/local/include/libavutil/common.h

添加如下代码可以解决。

//add by bg2bkk

#ifndef UINT64_C#define UINT64_C(value) __CONCAT(value, ULL)#endif//add by bg2bkk

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