movies/ffmpeg/ffmpeg.go

package ffmpeg

import (
	"fmt"
	"os/exec"
	"strings"
)

const (
	inputFileIdentifier = "INPUT_VIDEO_FILE"
)

var (
	Debug = true
)

func MediaInfo(path string) (string, error) {
	out, err := execCommand(
		fmt.Sprintf("-i %s", inputFileIdentifier),
		path)
	if err.Error() == "exit status 1" && strings.HasSuffix(out, "At least one output file must be specified") {
		err = nil
	}
	return out, err
}

func execCommand(cmdStr, path string) (string, error) {
	cmdSplit := strings.Split(cmdStr, " ")
	for i, s := range cmdSplit {
		if s == inputFileIdentifier {
			cmdSplit[i] = path
		}
	}

	cmd := exec.Command("ffmpeg", cmdSplit...)

	if Debug {
		fmt.Println("Executing:", cmd)
	}
	out, err := cmd.CombinedOutput()
	if err != nil {
		fmt.Printf("Error: %#v\n", err.Error())
		return strings.TrimSuffix(string(out), "\n"), err
	}
	if Debug {
		fmt.Printf("Output: %s\n", string(out))
	}

	return strings.TrimSuffix(string(out), "\n"), err
}