rewrite extension handling, initial video support

Thumbnailer.go

@@ -60,22 +60,34 @@ func (this *Thumbnailer) RenderFile_NoCache(absPath string) ([]byte, error) {
 
 	defer fh.Close()
 
-	var src image.Image
-	err = fmt.Errorf("No thumbnailer for file type")
+	if len(absPath) < 4 {
+		return nil, fmt.Errorf("No extension on filename")
+	}
+	extension := strings.ToLower(absPath[len(absPath)-4:])
 
-	comparePath := strings.ToLower(absPath)
+	switch extension {
+	case ".jpg", "jpeg":
+		src, err := jpeg.Decode(fh)
+		if err != nil {
+			return nil, err
+		}
 
-	if strings.HasSuffix(comparePath, "jpg") {
-		src, err = jpeg.Decode(fh)
+		return this.RenderScaledImage(src)
 
-	} else if strings.HasSuffix(comparePath, "png") {
-		src, err = png.Decode(fh)
+	case ".png":
+		src, err := png.Decode(fh)
+		if err != nil {
+			return nil, err
+		}
+
+		return this.RenderScaledImage(src)
+
+	case ".avi", ".mkv", ".mp4", ".ogm", ".wmv":
+		return this.RenderScaledFfmpeg(absPath)
+
+	default:
+		return nil, fmt.Errorf("No thumbnailer for file type")
 
 	}
 
-	if err != nil {
-		return nil, err
-	}
-
-	return this.RenderScaledImage(src)
 }

video.go

@@ -1,6 +1,8 @@
 package thumbnail
 
 import (
+	"bytes"
+	"io"
 	"os/exec"
 )
 
@@ -18,5 +20,26 @@ func (this *Thumbnailer) RenderScaledFfmpeg(absPath string) ([]byte, error) {
 		"-",
 	)
 
-	cmd.StdoutPipe()
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return nil, err
+	}
+
+	err = cmd.Start()
+	if err != nil {
+		return nil, err
+	}
+
+	out := bytes.Buffer{}
+	_, err = io.Copy(&out, stdout)
+	if err != nil {
+		return nil, err
+	}
+
+	err = cmd.Wait()
+	if err != nil {
+		return nil, err
+	}
+
+	return out.Bytes(), nil
 }