diff --git a/internal/encoder/encoder.go b/internal/encoder/encoder.go
index de6c6ea..c868956 100644
--- a/internal/encoder/encoder.go
+++ b/internal/encoder/encoder.go
@@ -83,19 +83,19 @@ func (e *Encoder) Transcode(input string, job *types.Job, metadata *types.Metada
 func (e *Encoder) extractAudio(input, dir string) ([]string, error) {
 	cmd := exec.Command(e.ffmpegPath, "-i", input,
 		"-vn", "-c:a", "pcm_s16le", "-ar", "48000",
-		"-f", "wav", filepath.Join(dir, "audio_%d.wav"))
+		"-f", "wav", filepath.Join(dir, "audio.wav"))
 	if out, err := cmd.CombinedOutput(); err != nil {
 		return nil, fmt.Errorf("ffmpeg extract: %s %w", out, err)
 	}
 
-	matches, _ := filepath.Glob(filepath.Join(dir, "audio_*.wav"))
+	matches, _ := filepath.Glob(filepath.Join(dir, "audio.wav"))
 	return matches, nil
 }
 
 func (e *Encoder) encodeOpus(wavs []string, dir string) ([]string, error) {
 	var opusFiles []string
 	for _, wav := range wavs {
-		out := strings.TrimSuffix(wav, ".wav") + ".opus"
+		out := strings.Replace(wav, ".wav", ".opus", 1)
 		cmd := exec.Command(e.opusencPath, "--bitrate", "128k", wav, out)
 		if out, err := cmd.CombinedOutput(); err != nil {
 			return nil, fmt.Errorf("opusenc: %s %w", out, err)