musica de fondo del cliente mezclada con voz

app.py

@@ -138,7 +138,22 @@ def montar_video(guion, archivos, subs=None, efecto="ninguno"):
     else:
         txts = []
 
-    final = CompositeVideoClip([clip]+txts).set_audio(voz)
+    # Mezclar musica de fondo si el cliente la subio
+    import os as _os
+    audio_final = voz
+    if _os.path.exists("musica.mp3"):
+        try:
+            from moviepy.editor import CompositeAudioClip, AudioFileClip as _AC
+            musica = _AC("musica.mp3").volumex(0.18)  # musica bajita para no tapar la voz
+            if musica.duration > voz.duration:
+                musica = musica.subclip(0, voz.duration)
+            else:
+                musica = musica.audio_loop(duration=voz.duration)
+            audio_final = CompositeAudioClip([voz.volumex(1.0), musica])
+        except Exception as _em:
+            log(f"Error mezcla musica: {_em}")
+            audio_final = voz
+    final = CompositeVideoClip([clip]+txts).set_audio(audio_final)
     final.write_videofile("preview.mp4", fps=30, codec="libx264", bitrate="1500k", preset="medium", logger=None, threads=2, audio_codec="aac")
     return "preview.mp4"
 
@@ -216,6 +231,22 @@ async def ep_voz_grabada(file: UploadFile = File(...)):
     except Exception as e:
         return JSONResponse({"error": str(e)[:120]}, status_code=500)
 
+
+@app.post("/subir-musica")
+async def ep_musica(file: UploadFile = File(...)):
+    try:
+        import subprocess, os as _os
+        contenido = await file.read()
+        with open("musica_raw","wb") as f:
+            f.write(contenido)
+        subprocess.run(["ffmpeg","-y","-i","musica_raw","-acodec","libmp3lame","musica.mp3"], capture_output=True)
+        if _os.path.exists("musica.mp3") and _os.path.getsize("musica.mp3") > 1000:
+            ESTADO["musica"] = True
+            return {"ok": True}
+        return JSONResponse({"error":"No se pudo procesar la musica"}, status_code=500)
+    except Exception as e:
+        return JSONResponse({"error": str(e)[:120]}, status_code=500)
+
 @app.get("/audio")
 def ep_audio():
     if os.path.exists("voz.mp3"):
@@ -376,6 +407,11 @@ audio,video{width:100%;margin-top:10px;border-radius:8px}
   </div>
   <div class="msg" id="msgVoz"></div>
   <audio id="player" controls style="display:none"></audio>
+  <div style="margin-top:14px;padding-top:14px;border-top:1px solid #222">
+    <span class="lbl">Musica de fondo (opcional, sonara bajita bajo la voz):</span>
+    <input type="file" id="musica" accept="audio/*" onchange="subirMusica()">
+    <div class="msg" id="msgMusica"></div>
+  </div>
 </div>
 
 <div class="fase">
@@ -472,6 +508,14 @@ async function genVideo(){
     }catch(e){}
   },4000);
 }
+async function subirMusica(){
+  var f=document.getElementById("musica").files[0]; if(!f)return;
+  var m=document.getElementById("msgMusica");m.textContent="Subiendo musica...";m.style.color="#ffb700";
+  var fd=new FormData(); fd.append("file",f);
+  var r=await fetch("/subir-musica",{method:"POST",body:fd}); var d=await r.json();
+  if(d.ok){m.textContent="✅ Musica anadida, sonara de fondo";m.style.color="#00c853";}
+  else{m.textContent="❌ "+(d.error||"Error");m.style.color="#ff5252";}
+}
 function cargarVideo(){
   var u="/video?t="+Date.now();
   var v=document.getElementById("vid");v.src=u;v.style.display="block";v.load();