[FFmpeg-user] help: I use av_err2str function in c++, it occurs " error: taking address of temporary array" when build.

[Lingjiang Fang]

On Thu, 10 Jun 2021 12:55:08 +0200
"Diederick C. Niehorster" <dcnieho at gmail.com> wrote:

> That macro doesn't work in C++. use:
> 
> char a[AV_ERROR_MAX_STRING_SIZE] = { 0 };
> av_make_error_string(a, AV_ERROR_MAX_STRING_SIZE, errCode_);
> 
> On Thu, Jun 10, 2021 at 12:40 PM 沈海煌 <chain78 at 163.com> wrote:
> >
> > I use av_err2str function in c++, it occurs  " error: taking
> > address of temporary array" when build.
> >
> >
> > I use extern "C" but it doesn't work.
my solution is override the default av_err2str() function in a
specified header file(needn't modify header in FFmpeg), like this:

#ifdef av_err2str
#undef av_err2str
#include <string>
av_always_inline std::string av_err2string(int errnum) {
    char str[AV_ERROR_MAX_STRING_SIZE];
    return av_make_error_string(str, AV_ERROR_MAX_STRING_SIZE, errnum);
}
#define av_err2str(err) av_err2string(err).c_str()
#endif  // av_err2str

or refer here:
https://github.com/joncampbell123/composite-video-simulator/issues/5

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Regards,
Lingjiang Fang