ArseniySavin

func FirstFrame(path string, data []byte) (*bufio.Reader, error) {
	cmd := exec.Command(path,
		"-i", "-", // read from stdin
		"-vframes", fmt.Sprint(1), // frame
		"-s", fmt.Sprintf("%dx%d", 640, 360), // size
		"-q:v", fmt.Sprint(2), // quality
		"-f", "singlejpeg", // jpeg binary
		"-", // read from stdout
	)
	// stdin read

ValchanOficial

https://gcc.gnu.org/
https://stackoverflow.com/questions/43580131/exec-gcc-executable-file-not-found-in-path-when-trying-go-build

gcc (the GNU Compiler Collection) provides a C compiler. 
On Windows, install TDM-GCC(http://tdm-gcc.tdragon.net/download). The github.com/miekg/pkcs11 package uses cgo. 
Cgo enables the creation of Go packages that call C code.

System Variables > PATH > add "C:\TDM-GCC-64\bin"