diff --git a/transcoder/main.go b/transcoder/main.go
index 44c90973..c8ccc73f 100644
--- a/transcoder/main.go
+++ b/transcoder/main.go
@@ -193,14 +193,10 @@ func (h *Handler) GetInfo(c echo.Context) error {
 //
 // Get a specific attachment.
 //
-// Path: /:sha/attachment/:name
+// Path: /attachment/:name
 func (h *Handler) GetAttachment(c echo.Context) error {
-	sha := c.Param("sha")
 	name := c.Param("name")
 
-	if err := SanitizePath(sha); err != nil {
-		return err
-	}
 	if err := SanitizePath(name); err != nil {
 		return err
 	}
@@ -317,8 +313,8 @@ func main() {
 	e.GET("/info", h.GetInfo)
 	e.GET("/thumbnails.png", h.GetThumbnails)
 	e.GET("/thumbnails.vtt", h.GetThumbnailsVtt)
-	e.GET("/:sha/attachment/:name", h.GetAttachment)
-	e.GET("/:sha/subtitle/:name", h.GetSubtitle)
+	e.GET("/attachment/:name", h.GetAttachment)
+	e.GET("/subtitle/:name", h.GetSubtitle)
 
 	e.Logger.Fatal(e.Start(":7666"))
 }
diff --git a/transcoder/src/extract.go b/transcoder/src/extract.go
index 3173d966..ff1a0237 100644
--- a/transcoder/src/extract.go
+++ b/transcoder/src/extract.go
@@ -18,25 +18,18 @@ func NewExtractor() *Extractor {
 	}
 }
 
-func (e *Extractor) Extract(sha string) (<-chan struct{}, bool) {
-	e.lock.RLock()
-	existing, ok := e.extracted[sha]
-	e.lock.RUnlock()
-
-	if ok {
-		return existing, true
-	}
-	return nil, false
-}
-
-func (e *Extractor) RunExtractor(path string, sha string, subs *[]Subtitle) <-chan struct{} {
-	existing, ok := e.Extract(sha)
-	if ok {
-		return existing
+func (e *Extractor) Extract(path string, subs *[]Subtitle) (<-chan struct{}, error) {
+	sha, err := getHash(path)
+	if err != nil {
+		return nil, err
 	}
 
-	ret := make(chan struct{})
 	e.lock.Lock()
+	existing, ok := e.extracted[sha]
+	if ok {
+		return existing, nil
+	}
+	ret := make(chan struct{})
 	e.extracted[sha] = ret
 	e.lock.Unlock()
 
@@ -73,5 +66,5 @@ func (e *Extractor) RunExtractor(path string, sha string, subs *[]Subtitle) <-ch
 		close(ret)
 	}()
 
-	return ret
+	return ret, nil
 }
diff --git a/transcoder/src/thumbnails.go b/transcoder/src/thumbnails.go
index e4608294..bb0e9edf 100644
--- a/transcoder/src/thumbnails.go
+++ b/transcoder/src/thumbnails.go
@@ -1,8 +1,6 @@
 package src
 
 import (
-	"crypto/sha1"
-	"encoding/hex"
 	"fmt"
 	"image"
 	"image/color"
@@ -70,15 +68,10 @@ func (t *ThumbnailsCreator) ExtractThumbnail(path string, name string) (string,
 
 func extractThumbnail(path string, name string) (string, error) {
 	defer printExecTime("extracting thumbnails for %s", path)()
-	info, err := os.Stat(path)
+	sha, err := getHash(path)
 	if err != nil {
 		return "", err
 	}
-	h := sha1.New()
-	h.Write([]byte(path))
-	h.Write([]byte(info.ModTime().String()))
-	sha := hex.EncodeToString(h.Sum(nil))
-
 	out := fmt.Sprintf("%s/%s", Settings.Metadata, sha)
 	os.MkdirAll(out, 0o755)
 	sprite_path := fmt.Sprintf("%s/sprite.png", out)
diff --git a/transcoder/src/utils.go b/transcoder/src/utils.go
index 5277def3..74156d46 100644
--- a/transcoder/src/utils.go
+++ b/transcoder/src/utils.go
@@ -1,8 +1,11 @@
 package src
 
 import (
+	"crypto/sha1"
+	"encoding/hex"
 	"fmt"
 	"log"
+	"os"
 	"time"
 )
 
@@ -15,3 +18,15 @@ func printExecTime(message string, args ...any) func() {
 		log.Printf("%s finished in %s", msg, time.Since(start))
 	}
 }
+
+func getHash(path string) (string, error) {
+	info, err := os.Stat(path)
+	if err != nil {
+		return "", err
+	}
+	h := sha1.New()
+	h.Write([]byte(path))
+	h.Write([]byte(info.ModTime().String()))
+	sha := hex.EncodeToString(h.Sum(nil))
+	return sha, nil
+}