Function av_make_error_string 

pub unsafe fn av_make_error_string(
    errbuf: *mut c_char,
    errbuf_size: size_t,
    errnum: c_int,
) -> *mut c_char

Fills the errbuf with a description for errnum or a generic message if no specific description can be found.

The returned C-string will be null-terminated.

Safety

errbuf and errbuf_size must describe a valid C-style char array, i.e.

• errbuf must be non-null and well-aligned and
• errbuf must be valid for errbuf_size reads/writes.