全网首发：FFMPEG错误： error: implicit declaration of function ‘wcscpy‘/wcscmp； did you mean ‘strcpy‘strcmp?

具体错误：

libavdevice/dshow_filter.c:109:10: error: implicit declaration of function 'wcscmp'; did you mean 'strcmp'? [-Werror=implicit-function-declaration]
     if (!wcscmp(id, L"In")) {
          ^~~~~~
          strcmp

libavdevice/dshow_filter.c:115:16: note: each undeclared identifier is reported only once for each function it appears in
libavdevice/dshow_filter.c: In function 'ff_dshow_filter_JoinFilterGraph':
libavdevice/dshow_filter.c:138:9: error: implicit declaration of function 'wcscpy'; did you mean 'strcpy'? [-Werror=implicit-function-declaration]
         wcscpy(this->info.achName, name);
         ^~~~~~
         strcpy

解决办法：

打开libavdevice/dshow_filter.c，在头部加入：

#include <wchar.h>