Support a local working directory copy of ffmpeg. Closes #276

config/defaults.go

@@ -28,6 +28,14 @@ func getDefaults() config {
 }
 
 func getDefaultFFMpegPath() string {
+	// First look to see if ffmpeg is in the current working directory
+	localCopy := "./ffmpeg"
+	hasLocalCopyError := verifyFFMpegPath(localCopy)
+	if hasLocalCopyError == nil {
+		// No error, so all is good.  Use the local copy.
+		return localCopy
+	}
+
 	cmd := exec.Command("which", "ffmpeg")
 	out, err := cmd.CombinedOutput()
 	if err != nil {

config/verifyInstall.go

@@ -0,0 +1,32 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"os"
+)
+
+//verifyFFMpegPath verifies that the path exists, is a file, and is executable
+func verifyFFMpegPath(path string) error {
+	stat, err := os.Stat(path)
+
+	if os.IsNotExist(err) {
+		return errors.New("ffmpeg path does not exist")
+	}
+
+	if err != nil {
+		return fmt.Errorf("error while verifying the ffmpeg path: %s", err.Error())
+	}
+
+	if stat.IsDir() {
+		return errors.New("ffmpeg path can not be a folder")
+	}
+
+	mode := stat.Mode()
+	//source: https://stackoverflow.com/a/60128480
+	if mode&0111 == 0 {
+		return errors.New("ffmpeg path is not executable")
+	}
+
+	return nil
+}