diff --git a/editor.py b/editor.py
index 4805861..874fe41 100644
--- a/editor.py
+++ b/editor.py
@@ -241,12 +241,16 @@ def create_finished(filename, start, end):
     result = subprocess.run(
         [
             "ffmpeg", "-hide_banner", "-loglevel", "warning", "-y",
-            "-i", str(source),
+            "-fflags", "+genpts",
             "-ss", f"{start:.3f}",
+            "-i", str(source),
             "-t", f"{end - start:.3f}",
+            "-map", "0:a:0",
+            "-vn", "-sn", "-dn",
             "-af", "loudnorm=I=-16:TP=-1.5:LRA=11",
             "-c:a", "libmp3lame",
             "-b:a", "128k",
+            "-avoid_negative_ts", "make_zero",
             str(temp),
         ],
         capture_output=True, text=True, timeout=1800,
@@ -676,8 +680,15 @@ async function trim() {
   msg('Aufnahme wird geschnitten …',true);
   try {
     const r=await fetch('/api/edit', {method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({filename,start,end})});
-    const d=await r.json();
-    if(!r.ok || !d.success) throw new Error(d.error || 'Fehler beim Schneiden');
+    const contentType = r.headers.get('content-type') || '';
+    let d;
+    if (contentType.includes('application/json')) {
+      d = await r.json();
+    } else {
+      const text = await r.text();
+      throw new Error(`Serverfehler HTTP ${r.status}: ${text.slice(0, 200)}`);
+    }
+    if(!r.ok || !d.success) throw new Error(d.error || `Fehler beim Schneiden (HTTP ${r.status})`);
     msg('Fertige Aufnahme erfolgreich erstellt.',true);
     setTimeout(()=>location.reload(),700);
   } catch(e) { msg(e.message,false); btn.disabled=false; }