feat(video): generación de vídeo H3 async (no bloqueante) con estados queued→ready

En vez de esperar el render dentro de la request (imposible con la cola nocturna de H3),
ahora el ciclo es async y la cola/worker viven server-side en h3api:

- submit no bloqueante: POST /v1/jobs → se persiste una variación `queued` con h3_job_id y se
  responde al instante. video-service expone submitVideoJob() + getJobStatus() (sin polling).
- nueva acción `sync-jobs` en el route de vídeos: avanza los jobs pendientes del capítulo
  (queued→processing→ready/error); en `done` descarga el mp4, lo guarda y auto-selecciona la
  primera variación lista. Reintenta en el siguiente tick ante fallos de red (no marca error).
- SQLite: columnas `status`/`h3_job_id`/`error` en video_variations + migración idempotente
  (filas existentes → 'ready'). video_url pasa a DEFAULT '' (queued aún no tiene vídeo).
- UI: la tarjeta de variación muestra spinner 'En cola'/'Generando…' y estado 'error'; el
  player solo con variación 'ready'. La página hace polling cada 45s solo si hay pendientes.
- resolución por plano (16:9 832×480 / 9:16 480×832 vía body.aspect). cost_usd = 0.

NO mergear a master hasta que essia-server dé "live" + H3API_KEY.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/api/projects/[slug]/capitulos/[numero]/videos/route.ts

@@ -1,8 +1,9 @@
 import { NextRequest, NextResponse } from 'next/server';
-import { generateVideo, downloadVideo } from '@/lib/video-service';
+import { submitVideoJob, getJobStatus, downloadVideo, H3_COST_USD } from '@/lib/video-service';
 import {
   getPromptsPlanos, updatePromptPlano, getCapDirName,
   getVideoVariations, saveVideoVariation, selectVideoVariation, deleteVideoVariation,
+  getPendingVideoVariations, updateVideoVariationProgress,
 } from '@/lib/db-service';
 import fs from 'fs/promises';
 import path from 'path';
@@ -34,13 +35,18 @@ export async function GET(
       };
     });
 
-    const generated = planosWithVariations.filter(p => p.videoVariations && p.videoVariations.length > 0).length;
+    const generated = planosWithVariations.filter(p => p.videoVariations.some(v => v.status === 'ready')).length;
+    const pending = planosWithVariations.reduce(
+      (n, p) => n + p.videoVariations.filter(v => v.status === 'queued' || v.status === 'processing').length,
+      0,
+    );
     const withPrompt = planos.filter(p => p.promptVideo).length;
 
     return NextResponse.json({
       planos: planosWithVariations,
       total: planos.length,
       generated,
+      pending,
       withPrompt,
     });
   } catch (error: any) {
@@ -82,7 +88,8 @@ export async function POST(
       return NextResponse.json({ plano: { ...plano, promptVideo } });
     }
 
-    // Action: generate (generate new video variation)
+    // Action: generate — encola un job de vídeo en H3 y devuelve al instante.
+    // El render lo drena el worker de H3 (ventana nocturna); el estado se refresca con 'sync-jobs'.
     if (action === 'generate') {
       if (!plano.imagenUrl) {
         return NextResponse.json({ error: 'El plano no tiene imagen generada' }, { status: 400 });
@@ -91,75 +98,51 @@ export async function POST(
       // Use custom prompt if provided, otherwise compose from plano data
       const videoPrompt = promptVideo || plano.promptVideo || composeVideoPrompt(plano);
 
-      // Read image from disk and convert to base64 data URL
-      // This is needed because localhost URLs are not accessible by Seedance API
-      const capitulosDir = path.join(PROJECTS_DIR, slug, 'capitulos');
-      const imagePath = path.join(capitulosDir, capDirName, 'imagenes', `${planoId}.png`);
-
+      // Read image from disk and convert to base64 data URL (la API H3 no ve URLs de localhost)
+      const imagePath = path.join(PROJECTS_DIR, slug, 'capitulos', capDirName, 'imagenes', `${planoId}.png`);
       let imageDataUrl: string;
       try {
         const imageBuffer = await fs.readFile(imagePath);
-        const base64Image = imageBuffer.toString('base64');
-        imageDataUrl = `data:image/png;base64,${base64Image}`;
-        console.log(`[Videos API] Image loaded from disk: ${imagePath.length} chars (base64)`);
+        imageDataUrl = `data:image/png;base64,${imageBuffer.toString('base64')}`;
       } catch (err) {
         return NextResponse.json({ error: 'No se pudo leer la imagen del plano' }, { status: 500 });
       }
 
-      console.log(`[Videos API] Generating video for plano ${planoId} with prompt: "${videoPrompt}"`);
+      // Resolución por plano: 16:9 (default) o 9:16 según body.aspect.
+      const aspect = body.aspect === '9:16' ? '9:16' : '16:9';
+      const [width, height] = aspect === '9:16' ? [480, 832] : [832, 480];
 
-      // Generate video using Seedance 1.5 Pro with base64 image
-      // generateAudio=true with prompt instruction for natural sounds only (no music)
-      const result = await generateVideo(
-        imageDataUrl,
-        videoPrompt,
-        plano.tiempoSegundos || 5,
-        false, // cameraFixed
-        true   // generateAudio (natural sounds only via prompt)
-      );
+      console.log(`[Videos API] Encolando vídeo H3 para plano ${planoId} (${aspect})`);
 
-      console.log(`[Videos API] Video generated in ${result.generationTimeSeconds}s, cost: $${result.costUsd}`);
+      let jobId: string;
+      let fullPrompt: string;
+      try {
+        ({ jobId, fullPrompt } = await submitVideoJob(imageDataUrl, videoPrompt, {
+          duration: plano.tiempoSegundos || 5,
+          width,
+          height,
+        }));
+      } catch (e: any) {
+        return NextResponse.json({ error: e.message || 'Error encolando el vídeo' }, { status: 502 });
+      }
 
-      // Download video and save to disk
-      const videoBuffer = await downloadVideo(result.videoUrl);
-      const videosDir = path.join(PROJECTS_DIR, slug, 'capitulos', capDirName, 'videos');
-      await fs.mkdir(videosDir, { recursive: true });
-
-      // Generate unique filename for this variation
+      // Persistir la variación en estado 'queued' (sin vídeo aún). NO se auto-selecciona hasta
+      // que esté 'ready' (ver sync-jobs).
       const variationId = randomUUID();
-      const videoFileName = `${planoId}-${variationId}.mp4`;
-      const videoPath = path.join(videosDir, videoFileName);
-      await fs.writeFile(videoPath, videoBuffer);
-
-      console.log(`[Videos API] Video saved to: ${videoPath}`);
-
-      // Get existing variations to determine if this should be selected
-      const existingVariations = getVideoVariations(slug, num, planoId);
-      const isFirstVariation = existingVariations.length === 0;
-
-      // Save variation to DB
-      const videoUrl = `/api/projects/${slug}/capitulos/${capDirName}/videos/${videoFileName.replace('.mp4', '')}`;
       saveVideoVariation(slug, num, {
         id: variationId,
         planoId,
-        videoUrl,
-        videoPath,
-        promptVideo: result.fullPrompt,
-        generationTimeSeconds: result.generationTimeSeconds,
-        costUsd: result.costUsd,
-        isSelected: isFirstVariation,
+        videoUrl: '',
+        promptVideo: fullPrompt,
+        costUsd: H3_COST_USD,
+        isSelected: false,
         createdAt: new Date().toISOString(),
+        status: 'queued',
+        h3JobId: jobId,
       });
 
-      // Update legacy fields if this is the first variation
-      if (isFirstVariation) {
-        updatePromptPlano(slug, num, planoId, { videoUrl, promptVideo: result.fullPrompt });
-      }
-
-      // Return updated variations
       const variations = getVideoVariations(slug, num, planoId);
       const selectedVariation = variations.find(v => v.isSelected);
-
       return NextResponse.json({
         plano: {
           ...plano,
@@ -170,6 +153,75 @@ export async function POST(
       });
     }
 
+    // Action: sync-jobs — avanza los jobs de vídeo pendientes del capítulo (queued/processing).
+    // Lo llama el cliente periódicamente mientras haya variaciones pendientes. Sin lógica de
+    // ventana ni pings: una sola consulta por job; si 'done' descarga el mp4 y marca 'ready'.
+    if (action === 'sync-jobs') {
+      const pending = getPendingVideoVariations(slug, num);
+      const videosDir = path.join(PROJECTS_DIR, slug, 'capitulos', capDirName, 'videos');
+
+      for (const v of pending) {
+        if (!v.h3JobId) continue;
+        try {
+          const job = await getJobStatus(v.h3JobId);
+
+          if (job.status === 'processing' && v.status !== 'processing') {
+            updateVideoVariationProgress(v.id, { status: 'processing' });
+          } else if (job.status === 'error') {
+            updateVideoVariationProgress(v.id, { status: 'error', error: job.error || 'Error en el render H3' });
+          } else if (job.status === 'done') {
+            if (!job.videoUrl) {
+              updateVideoVariationProgress(v.id, { status: 'error', error: 'H3 done sin video_url' });
+              continue;
+            }
+            // Descargar y guardar el mp4 en disco.
+            const videoBuffer = await downloadVideo(job.videoUrl);
+            await fs.mkdir(videosDir, { recursive: true });
+            const videoFileName = `${v.planoId}-${v.id}.mp4`;
+            const videoPath = path.join(videosDir, videoFileName);
+            await fs.writeFile(videoPath, videoBuffer);
+
+            const localUrl = `/api/projects/${slug}/capitulos/${capDirName}/videos/${videoFileName.replace('.mp4', '')}`;
+            updateVideoVariationProgress(v.id, {
+              status: 'ready',
+              videoUrl: localUrl,
+              videoPath,
+              generationTimeSeconds: job.generationTimeSeconds,
+            });
+
+            // Si el plano no tiene ninguna variación 'ready' seleccionada, seleccionar ésta.
+            const siblings = getVideoVariations(slug, num, v.planoId);
+            const hasSelectedReady = siblings.some(s => s.isSelected && s.status === 'ready' && s.id !== v.id);
+            if (!hasSelectedReady) {
+              selectVideoVariation(slug, num, v.planoId, v.id);
+              updatePromptPlano(slug, num, v.planoId, { videoUrl: localUrl, promptVideo: v.promptVideo });
+            }
+          }
+          // 'queued' → sin cambios
+        } catch (e: any) {
+          // Fallo transitorio consultando/descargando: dejar la variación como está y reintentar
+          // en el próximo sync. No la marcamos 'error' por un fallo de red puntual.
+          console.warn(`[Videos API] sync-jobs: fallo con job ${v.h3JobId}: ${e.message}`);
+        }
+      }
+
+      // Devolver el estado actualizado de todos los planos del capítulo.
+      const allPlanos = getPromptsPlanos(slug, num).map(p => {
+        const variations = getVideoVariations(slug, num, p.id);
+        const selectedVariation = variations.find(vv => vv.isSelected);
+        return {
+          ...p,
+          videoVariations: variations,
+          videoUrl: selectedVariation?.videoUrl || p.videoUrl,
+          promptVideo: selectedVariation?.promptVideo || p.promptVideo,
+        };
+      });
+      const generated = allPlanos.filter(p => p.videoVariations.some(vv => vv.status === 'ready')).length;
+      const stillPending = getPendingVideoVariations(slug, num).length;
+
+      return NextResponse.json({ planos: allPlanos, generated, pending: stillPending });
+    }
+
     // Action: select-variation (select a specific variation)
     if (action === 'select-variation') {
       const { variationId } = body;

src/app/project/[slug]/capitulo/[numero]/page.tsx

@@ -674,47 +674,43 @@ export default function CapituloPage({
   };
 
   const handleGeneratePlanoVideo = async (planoId: string, customPrompt?: string) => {
+    // El render es async (cola nocturna de H3): encolamos y devolvemos al instante; el estado
+    // real (queued → processing → ready) lo refresca el polling de syncVideoJobs.
     setGeneratingVideo(planoId);
-    startProgress('Generando Video', 0, `Generando video para plano ${planoId}...`);
     try {
       const res = await fetch(`/api/projects/${slug}/capitulos/${numero}/videos`, {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({ action: 'generate', planoId, promptVideo: customPrompt }),
-        signal: abortRef.current?.signal,
       });
       const data = await res.json();
-      if (!res.ok) { showToast(data.error || 'Error generando video', 'error'); closeProgress(); return; }
+      if (!res.ok) { showToast(data.error || 'Error encolando el vídeo', 'error'); return; }
       if (videosData) {
         const updatedPlanos = videosData.planos.map(p => p.id === planoId ? data.plano : p);
-        const generated = updatedPlanos.filter(p => p.videoVariations && p.videoVariations.length > 0).length;
-        setVideosData({ ...videosData, planos: updatedPlanos, generated });
+        setVideosData({ ...videosData, planos: updatedPlanos });
       }
-      addProgressLog(`Video generado para ${planoId}`, 'success');
-      finishProgress(1, 1);
-      showToast(`Video generado para plano ${planoId}`, 'success');
-    } catch (error: any) {
-      if (error.name !== 'AbortError') { showToast('Error al generar video', 'error'); }
-      closeProgress();
+      showToast('Vídeo en cola — se generará en la ventana nocturna', 'success');
+    } catch {
+      showToast('Error al encolar el vídeo', 'error');
     } finally { setGeneratingVideo(null); }
   };
 
   const handleGenerateAllVideos = async (onlyPending = false) => {
     if (!videosData) return;
-    const pending = onlyPending
-      ? videosData.planos.filter(p => p.imagenUrl && (!p.videoVariations || p.videoVariations.length === 0))
+    const targets = onlyPending
+      ? videosData.planos.filter(p => p.imagenUrl && !(p.videoVariations || []).some(v => v.status === 'ready' || v.status === 'queued' || v.status === 'processing'))
       : videosData.planos.filter(p => p.imagenUrl);
-    if (pending.length === 0) return;
+    if (targets.length === 0) return;
 
-    startProgress('Generando Videos', pending.length, `Video 1/${pending.length}...`);
+    startProgress('Encolando vídeos', targets.length, `Encolando 1/${targets.length}...`);
     let successCount = 0;
     let errorCount = 0;
     let localPlanos = [...videosData.planos];
 
-    for (let i = 0; i < pending.length; i++) {
+    for (let i = 0; i < targets.length; i++) {
       if (abortRef.current?.signal.aborted) break;
-      const plano = pending[i];
-      updateProgress(i, pending.length, `Video ${i + 1}/${pending.length} — ${plano.numeroPlano || plano.id}`);
+      const plano = targets[i];
+      updateProgress(i, targets.length, `Encolando ${i + 1}/${targets.length} — ${plano.numeroPlano || plano.id}`);
 
       try {
         const res = await fetch(`/api/projects/${slug}/capitulos/${numero}/videos`, {
@@ -726,8 +722,7 @@ export default function CapituloPage({
         const data = await res.json();
         if (res.ok) {
           localPlanos = localPlanos.map(p => p.id === plano.id ? data.plano : p);
-          const generated = localPlanos.filter(p => p.videoVariations && p.videoVariations.length > 0).length;
-          setVideosData({ ...videosData, planos: localPlanos, generated });
+          setVideosData({ ...videosData, planos: localPlanos });
           addProgressLog(`${plano.numeroPlano || plano.id}`, 'success');
           successCount++;
         } else {
@@ -741,14 +736,43 @@ export default function CapituloPage({
       }
     }
 
-    finishProgress(pending.length, pending.length);
+    finishProgress(targets.length, targets.length);
     if (errorCount > 0) {
-      showToast(`${successCount} variaciones generadas, ${errorCount} con error`, 'error');
+      showToast(`${successCount} vídeos encolados, ${errorCount} con error`, 'error');
     } else {
-      showToast(`${successCount} variaciones generadas correctamente`, 'success');
+      showToast(`${successCount} vídeos en cola — se generarán en la ventana nocturna`, 'success');
     }
   };
 
+  // Refresca el estado de los jobs de vídeo pendientes (queued/processing) del capítulo.
+  const syncVideoJobs = useCallback(async () => {
+    try {
+      const res = await fetch(`/api/projects/${slug}/capitulos/${numero}/videos`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ action: 'sync-jobs' }),
+      });
+      if (!res.ok) return;
+      const data = await res.json();
+      if (data.planos) {
+        setVideosData(prev => prev ? { ...prev, planos: data.planos, generated: data.generated } : prev);
+      }
+    } catch {
+      // fallo transitorio de red: reintenta en el próximo tick
+    }
+  }, [slug, numero]);
+
+  // Polling mientras haya variaciones de vídeo pendientes. Sin pings agresivos: cada 45s.
+  const hasPendingVideos = !!videosData?.planos.some(
+    p => (p.videoVariations || []).some(v => v.status === 'queued' || v.status === 'processing')
+  );
+  useEffect(() => {
+    if (!hasPendingVideos) return;
+    syncVideoJobs(); // refresco inmediato al detectar pendientes
+    const id = setInterval(syncVideoJobs, 45000);
+    return () => clearInterval(id);
+  }, [hasPendingVideos, syncVideoJobs]);
+
   const handleSaveVideoPrompt = async (planoId: string, promptVideo: string) => {
     try {
       const res = await fetch(`/api/projects/${slug}/capitulos/${numero}/videos`, {

src/components/capitulo/VideoVariationsCard.tsx

@@ -2,7 +2,7 @@
 
 import { useState } from 'react';
 import { Button } from '@/components/ui/Button';
-import { Video, Edit3, Save, Trash2, Check } from 'lucide-react';
+import { Video, Edit3, Trash2, Check, Loader2 } from 'lucide-react';
 import type { PlanoConPrompt, VideoVariation } from '@/types/project';
 
 interface VideoVariationsCardProps {
@@ -167,6 +167,8 @@ export function VideoVariationsCard({
           <div className="grid grid-cols-2 gap-2">
             {variations.map((variation) => {
               const isSelected = variation.isSelected;
+              const isReady = variation.status === 'ready';
+              const isError = variation.status === 'error';
               return (
                 <div
                   key={variation.id}
@@ -174,19 +176,40 @@ export function VideoVariationsCard({
                     isSelected ? 'border-indigo-500 ring-2 ring-indigo-200' : 'border-stone-200 hover:border-stone-300'
                   }`}
                 >
-                  <video
-                    src={variation.videoUrl}
-                    className="w-full cursor-pointer"
-                    style={{ aspectRatio: '16/9' }}
-                    onClick={() => !isSelected && onSelectVariation(plano.id, variation.id)}
-                    onMouseEnter={(e) => (e.currentTarget as HTMLVideoElement).play()}
-                    onMouseLeave={(e) => {
-                      const vid = e.currentTarget as HTMLVideoElement;
-                      vid.pause();
-                      vid.currentTime = 0;
-                    }}
-                  />
-                  {isSelected && (
+                  {isReady ? (
+                    <video
+                      src={variation.videoUrl}
+                      className="w-full cursor-pointer"
+                      style={{ aspectRatio: '16/9' }}
+                      onClick={() => !isSelected && onSelectVariation(plano.id, variation.id)}
+                      onMouseEnter={(e) => (e.currentTarget as HTMLVideoElement).play()}
+                      onMouseLeave={(e) => {
+                        const vid = e.currentTarget as HTMLVideoElement;
+                        vid.pause();
+                        vid.currentTime = 0;
+                      }}
+                    />
+                  ) : (
+                    <div
+                      className={`w-full flex flex-col items-center justify-center gap-1 text-center px-2 ${
+                        isError ? 'bg-red-50 text-red-500' : 'bg-stone-50 text-stone-400'
+                      }`}
+                      style={{ aspectRatio: '16/9' }}
+                      title={variation.error || undefined}
+                    >
+                      {isError ? (
+                        <span className="text-[10px] font-medium">Error</span>
+                      ) : (
+                        <>
+                          <Loader2 className="w-4 h-4 animate-spin" />
+                          <span className="text-[9px] font-medium">
+                            {variation.status === 'processing' ? 'Generando…' : 'En cola'}
+                          </span>
+                        </>
+                      )}
+                    </div>
+                  )}
+                  {isSelected && isReady && (
                     <div className="absolute top-1 left-1 bg-indigo-500 text-white rounded-full p-0.5">
                       <Check className="w-3 h-3" />
                     </div>
@@ -198,16 +221,15 @@ export function VideoVariationsCard({
                   >
                     <Trash2 className="w-3 h-3" />
                   </button>
-                  <div className="absolute bottom-0 left-0 right-0 bg-gradient-to-t from-black/60 to-transparent px-1.5 py-1">
-                    <div className="flex items-center justify-between text-[8px] text-white">
-                      {variation.generationTimeSeconds && (
-                        <span>{variation.generationTimeSeconds.toFixed(1)}s</span>
-                      )}
-                      {variation.costUsd !== undefined && (
-                        <span>${variation.costUsd.toFixed(3)}</span>
-                      )}
+                  {isReady && (
+                    <div className="absolute bottom-0 left-0 right-0 bg-gradient-to-t from-black/60 to-transparent px-1.5 py-1">
+                      <div className="flex items-center justify-between text-[8px] text-white">
+                        {variation.generationTimeSeconds && (
+                          <span>{variation.generationTimeSeconds.toFixed(1)}s</span>
+                        )}
+                      </div>
                     </div>
-                  </div>
+                  )}
                 </div>
               );
             })}

src/lib/db-service.ts

@@ -767,13 +767,17 @@ export function getVideoVariations(slug: string, numero: number, planoId: string
 
   const rows = getDb().prepare(`
     SELECT id, plano_id, capitulo_id, video_url, video_path, prompt_video,
-           generation_time_seconds, cost_usd, is_selected, created_at
+           generation_time_seconds, cost_usd, is_selected, created_at, status, h3_job_id, error
     FROM video_variations
     WHERE capitulo_id = ? AND plano_id = ?
     ORDER BY created_at DESC
   `).all(capId, planoId) as any[];
 
-  return rows.map(r => ({
+  return rows.map(mapVideoVariationRow);
+}
+
+function mapVideoVariationRow(r: any): VideoVariation {
+  return {
     id: r.id,
     planoId: r.plano_id,
     capituloId: r.capitulo_id,
@@ -781,10 +785,51 @@ export function getVideoVariations(slug: string, numero: number, planoId: string
     videoPath: r.video_path || undefined,
     promptVideo: r.prompt_video,
     generationTimeSeconds: r.generation_time_seconds || undefined,
-    costUsd: r.cost_usd || undefined,
+    costUsd: r.cost_usd ?? undefined,
     isSelected: r.is_selected === 1,
     createdAt: r.created_at,
-  }));
+    status: (r.status || 'ready') as VideoVariation['status'],
+    h3JobId: r.h3_job_id || undefined,
+    error: r.error || undefined,
+  };
+}
+
+/**
+ * Get non-terminal video variations (queued|processing) across a whole chapter.
+ * Used by the async sync endpoint to advance jobs.
+ */
+export function getPendingVideoVariations(slug: string, numero: number): VideoVariation[] {
+  const capId = resolveCapituloId(slug, numero);
+  if (!capId) return [];
+  const rows = getDb().prepare(`
+    SELECT id, plano_id, capitulo_id, video_url, video_path, prompt_video,
+           generation_time_seconds, cost_usd, is_selected, created_at, status, h3_job_id, error
+    FROM video_variations
+    WHERE capitulo_id = ? AND status IN ('queued', 'processing')
+    ORDER BY created_at ASC
+  `).all(capId) as any[];
+  return rows.map(mapVideoVariationRow);
+}
+
+/**
+ * Update the progress/result of a video variation (async H3 lifecycle).
+ * Only overwrites the fields provided.
+ */
+export function updateVideoVariationProgress(
+  variationId: string,
+  patch: Partial<Pick<VideoVariation, 'status' | 'videoUrl' | 'videoPath' | 'generationTimeSeconds' | 'costUsd' | 'error'>>
+): void {
+  const sets: string[] = [];
+  const vals: any[] = [];
+  if (patch.status !== undefined) { sets.push('status = ?'); vals.push(patch.status); }
+  if (patch.videoUrl !== undefined) { sets.push('video_url = ?'); vals.push(patch.videoUrl); }
+  if (patch.videoPath !== undefined) { sets.push('video_path = ?'); vals.push(patch.videoPath); }
+  if (patch.generationTimeSeconds !== undefined) { sets.push('generation_time_seconds = ?'); vals.push(patch.generationTimeSeconds); }
+  if (patch.costUsd !== undefined) { sets.push('cost_usd = ?'); vals.push(patch.costUsd); }
+  if (patch.error !== undefined) { sets.push('error = ?'); vals.push(patch.error); }
+  if (sets.length === 0) return;
+  vals.push(variationId);
+  getDb().prepare(`UPDATE video_variations SET ${sets.join(', ')} WHERE id = ?`).run(...vals);
 }
 
 /**
@@ -802,19 +847,22 @@ export function saveVideoVariation(
   db.prepare(`
     INSERT INTO video_variations
     (id, plano_id, capitulo_id, video_url, video_path, prompt_video,
-     generation_time_seconds, cost_usd, is_selected, created_at)
-    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+     generation_time_seconds, cost_usd, is_selected, created_at, status, h3_job_id, error)
+    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
   `).run(
     variation.id,
     variation.planoId,
     capId,
-    variation.videoUrl,
+    variation.videoUrl || '',
     variation.videoPath || null,
     variation.promptVideo,
-    variation.generationTimeSeconds || null,
-    variation.costUsd || null,
+    variation.generationTimeSeconds ?? null,
+    variation.costUsd ?? null,
     variation.isSelected ? 1 : 0,
-    variation.createdAt
+    variation.createdAt,
+    variation.status || 'ready',
+    variation.h3JobId || null,
+    variation.error || null
   );
 }
 

src/lib/db.ts

@@ -155,13 +155,17 @@ function initSchema(db: Database.Database): void {
       id TEXT PRIMARY KEY,
       plano_id TEXT NOT NULL,
       capitulo_id TEXT NOT NULL REFERENCES capitulos(id) ON DELETE CASCADE,
-      video_url TEXT NOT NULL,
+      video_url TEXT NOT NULL DEFAULT '',
       video_path TEXT,
       prompt_video TEXT NOT NULL,
       generation_time_seconds REAL,
       cost_usd REAL,
       is_selected INTEGER NOT NULL DEFAULT 0,
-      created_at TEXT NOT NULL DEFAULT (datetime('now'))
+      created_at TEXT NOT NULL DEFAULT (datetime('now')),
+      -- Generación async (H3): job remoto y estado del ciclo de vida.
+      status TEXT NOT NULL DEFAULT 'ready',
+      h3_job_id TEXT,
+      error TEXT
     );
 
     -- Create indexes if they don't exist
@@ -200,4 +204,32 @@ function runMigrations(db: Database.Database): void {
       // Column already exists or other error - safe to ignore
     }
   }
+
+  // Migration: async video generation (H3) columns on video_variations.
+  const vvCols = (db.pragma('table_info(video_variations)') as Array<{ name: string }>).map(c => c.name);
+  if (!vvCols.includes('status')) {
+    try {
+      // Filas existentes ya tienen vídeo → 'ready'.
+      db.exec("ALTER TABLE video_variations ADD COLUMN status TEXT NOT NULL DEFAULT 'ready'");
+      console.log('[Migration] Added status column to video_variations');
+    } catch (e) {
+      // Column already exists or other error - safe to ignore
+    }
+  }
+  if (!vvCols.includes('h3_job_id')) {
+    try {
+      db.exec('ALTER TABLE video_variations ADD COLUMN h3_job_id TEXT');
+      console.log('[Migration] Added h3_job_id column to video_variations');
+    } catch (e) {
+      // Column already exists or other error - safe to ignore
+    }
+  }
+  if (!vvCols.includes('error')) {
+    try {
+      db.exec('ALTER TABLE video_variations ADD COLUMN error TEXT');
+      console.log('[Migration] Added error column to video_variations');
+    } catch (e) {
+      // Column already exists or other error - safe to ignore
+    }
+  }
 }

src/lib/video-service.ts

@@ -1,184 +1,158 @@
 /**
- * Video generation service using BytePlus Ark API with Seedance 1.5 Pro
+ * Video generation service — H3 async video API (h3api.essia.coop).
+ *
+ * Sustituye a BytePlus Ark / Seedance. Contrato definido por essia-server (2026-08):
+ *   POST /v1/jobs            (multipart o json) -> 202 { job_id, status:"queued" }
+ *   GET  /v1/jobs/{id}       -> { status, video_url?, generation_time_seconds?, error? }
+ *   GET  /v1/jobs/{id}/video -> binario mp4 (con audio nativo)
+ * Auth: header X-API-Key. Coste 0 (GPU self-hosted, sin tarifa por clip).
+ *
+ * La cola + worker viven SERVER-SIDE (h3api): `submitVideoJob` devuelve un job_id al instante
+ * (status=queued) y el server lo drena en la ventana nocturna. Aquí NO se bloquea la request:
+ * el ciclo submit → poll → descarga lo orquesta el route de vídeos de forma async (persistiendo
+ * el job_id en `video_variations` y refrescando estado bajo demanda desde el cliente).
+ *
+ * ESTADO: dormante hasta que essia-server confirme "live" + provea H3API_KEY. Sin esas env vars,
+ * submitVideoJob() lanza error solo si se invoca (no rompe el arranque).
  */
 
-const ARK_API_KEY = process.env.ARK_API_KEY || '';
-const ARK_BASE_URL = 'https://ark.ap-southeast.bytepluses.com/api/v3';
-const MODEL = 'seedance-1-5-pro-251215';
+const H3_BASE_URL = (process.env.H3API_BASE_URL || 'https://h3api.essia.coop').replace(/\/$/, '');
+const H3_API_KEY = process.env.H3API_KEY || '';
 
-// Pricing - Update based on BytePlus Ark actual pricing
-// Placeholder: $0.10 per video generation (adjust as needed)
-const COST_PER_VIDEO_USD = 0.10;
+// Modo i2v del MVP: ref2va (imagen->vídeo, validado). fl2va (primer frame exacto, más fiel a
+// Seedance) se activará pasando mode:'fl2va' cuando essia-server lo valide — mismo contrato.
+const DEFAULT_I2V_MODE = 'ref2va';
 
-interface ArkTaskResponse {
-  id: string;
-  model: string;
-  status: 'pending' | 'processing' | 'succeeded' | 'failed';
-  created_at: number;
-  updated_at: number;
-  content?: Array<{
-    type: string;
-    video_url?: { url: string };
-  }> | {
-    video_url?: { url: string };
-  };
-  error?: {
-    code: string;
-    message: string;
-  };
+// GPU propia self-hosted: sin tarifa por clip.
+const COST_PER_VIDEO_USD = 0;
+
+export type H3JobStatus = 'queued' | 'processing' | 'done' | 'error';
+
+export interface H3JobStatusResult {
+  status: H3JobStatus;
+  videoUrl?: string;
+  generationTimeSeconds?: number;
+  error?: string;
 }
 
-export interface VideoGenerationResult {
-  videoUrl: string;
-  generationTimeSeconds: number;
-  costUsd: number;
-  fullPrompt: string;
+interface H3JobResponse {
+  job_id: string;
+  status: H3JobStatus;
+  video_url?: string;
+  generation_time_seconds?: number;
+  error?: string | null;
+}
+
+export interface SubmitVideoOptions {
+  duration?: number;      // segundos, 4-15 (default 5)
+  cameraFixed?: boolean;  // añade indicación de movimiento mínimo al prompt
+  width?: number;         // múltiplo de 32 (default 832 = 16:9)
+  height?: number;        // múltiplo de 32 (default 480 = 16:9)
+  mode?: string;          // 'ref2va' (default) | 'fl2va' | 't2va'
+}
+
+export const H3_COST_USD = COST_PER_VIDEO_USD;
+
+function ensureConfigured(): void {
+  if (!H3_API_KEY) {
+    throw new Error('H3API_KEY no configurada en variables de entorno');
+  }
+}
+
+function authHeaders(extra?: Record<string, string>): Record<string, string> {
+  return { 'X-API-Key': H3_API_KEY, ...(extra || {}) };
+}
+
+/** Convierte un data URL (data:image/png;base64,...) a Blob para multipart. */
+function dataUrlToBlob(dataUrl: string): Blob {
+  const match = /^data:([^;]+);base64,([\s\S]*)$/.exec(dataUrl);
+  if (!match) {
+    throw new Error('imageUrl no es un data URL base64 válido');
+  }
+  const [, mime, b64] = match;
+  return new Blob([Buffer.from(b64, 'base64')], { type: mime });
 }
 
 /**
- * Generate video from image using Seedance 1.5 Pro
- * @param imageUrl - URL or data URL (base64) of the reference image
- * @param prompt - Text prompt describing the action/movement
- * @param duration - Video duration in seconds (default 5)
- * @param cameraFixed - Whether camera should be fixed (default false)
- * @param generateAudio - Whether to generate audio (default true)
- * @returns Video generation result with URL, time, and cost
+ * Encola un job de image-to-video en la H3 API y devuelve su id al instante (NO espera al render).
+ *
+ * @param imageUrl data URL base64 de la imagen del plano, o URL https accesible por el server.
+ * @param prompt   Prompt de movimiento (SOLO positivo; se recomienda movimiento mínimo).
+ * @returns { jobId, fullPrompt } — persiste jobId y consulta el estado con getJobStatus().
  */
-export async function generateVideo(
+export async function submitVideoJob(
   imageUrl: string,
   prompt: string,
-  duration: number = 5,
-  cameraFixed: boolean = false,
-  generateAudio: boolean = true
-): Promise<VideoGenerationResult> {
-  const startTime = Date.now();
-  if (!ARK_API_KEY) {
-    throw new Error('ARK_API_KEY no configurada en variables de entorno');
+  options: SubmitVideoOptions = {}
+): Promise<{ jobId: string; fullPrompt: string }> {
+  ensureConfigured();
+
+  const dur = Math.min(15, Math.max(4, options.duration || 5));
+  const width = options.width ?? 832;
+  const height = options.height ?? 480;
+  const mode = options.mode || DEFAULT_I2V_MODE;
+  const fullPrompt = options.cameraFixed
+    ? `${prompt} Minimal camera movement, subtle motion only.`
+    : prompt;
+
+  const form = new FormData();
+  form.append('mode', mode);
+  form.append('prompt', fullPrompt);
+  form.append('width', String(width));
+  form.append('height', String(height));
+  form.append('duration', String(dur));
+  if (imageUrl.startsWith('data:')) {
+    form.append('image', dataUrlToBlob(imageUrl), 'plano.png');
+  } else {
+    form.append('image_url', imageUrl);
   }
 
-  // Enhance prompt to request only natural sounds, no background music
-  const audioInstruction = generateAudio
-    ? 'Natural ambient sounds and action sounds only, no background music.'
-    : '';
-
-  // Compose the text prompt with audio instructions
-  const textPrompt = audioInstruction
-    ? `${prompt} ${audioInstruction} --duration ${duration} --camerafixed ${cameraFixed}`
-    : `${prompt} --duration ${duration} --camerafixed ${cameraFixed}`;
-
-  // Create video generation task
-  const createResponse = await fetch(`${ARK_BASE_URL}/contents/generations/tasks`, {
+  const res = await fetch(`${H3_BASE_URL}/v1/jobs`, {
     method: 'POST',
-    headers: {
-      'Content-Type': 'application/json',
-      'Authorization': `Bearer ${ARK_API_KEY}`,
-    },
-    body: JSON.stringify({
-      model: MODEL,
-      content: [
-        {
-          type: 'text',
-          text: textPrompt,
-        },
-        {
-          type: 'image_url',
-          image_url: {
-            url: imageUrl,
-          },
-        },
-      ],
-      // Additional parameters for video generation
-      duration,
-      resolution: '720p',
-      aspect_ratio: '16:9',
-      fps: 24,
-      camera_fixed: cameraFixed,
-      generate_audio: generateAudio,
-    }),
+    headers: authHeaders(), // no fijar Content-Type: fetch pone el boundary del multipart
+    body: form,
   });
 
-  if (!createResponse.ok) {
-    const errorData = await createResponse.json().catch(() => ({}));
-    throw new Error(`Error creando tarea de video: ${createResponse.status} ${JSON.stringify(errorData)}`);
+  if (!res.ok) {
+    const errorData = await res.text().catch(() => '');
+    throw new Error(`Error creando job de vídeo H3: ${res.status} ${errorData}`);
   }
 
-  const createData: ArkTaskResponse = await createResponse.json();
-  const taskId = createData.id;
-
-  console.log(`[Video Service] Task created: ${taskId}`);
-
-  // Poll task status until completed (max 5 minutes)
-  const maxAttempts = 300; // 5 minutes with 1s intervals
-  let attempts = 0;
-
-  while (attempts < maxAttempts) {
-    await new Promise(resolve => setTimeout(resolve, 1000)); // Wait 1 second
-
-    const statusResponse = await fetch(`${ARK_BASE_URL}/contents/generations/tasks/${taskId}`, {
-      headers: {
-        'Content-Type': 'application/json',
-        'Authorization': `Bearer ${ARK_API_KEY}`,
-      },
-    });
-
-    if (!statusResponse.ok) {
-      throw new Error(`Error consultando estado de tarea: ${statusResponse.status}`);
-    }
-
-    const statusData: ArkTaskResponse = await statusResponse.json();
-    console.log(`[Video Service] Task ${taskId} status: ${statusData.status}`);
-
-    if (statusData.status === 'succeeded') {
-      // Log the full response to understand its structure
-      console.log('[Video Service] Success response:', JSON.stringify(statusData, null, 2));
-
-      // Extract video URL from response
-      // Handle both array and object formats
-      let videoUrl: string | undefined;
-
-      if (Array.isArray(statusData.content)) {
-        // Array format: [{ type: 'video_url', video_url: { url: '...' } }]
-        const videoContent = statusData.content.find(c => c.type === 'video_url' && c.video_url);
-        videoUrl = videoContent?.video_url?.url;
-      } else if (statusData.content?.video_url) {
-        // Object format: { video_url: "https://..." } (direct string)
-        const vurl = (statusData.content as any).video_url;
-        videoUrl = typeof vurl === 'string' ? vurl : vurl?.url;
-      }
-
-      if (!videoUrl) {
-        throw new Error(`Video URL no encontrada en respuesta exitosa. Response: ${JSON.stringify(statusData)}`);
-      }
-
-      console.log(`[Video Service] Task ${taskId} succeeded: ${videoUrl}`);
-
-      const endTime = Date.now();
-      const generationTimeSeconds = (endTime - startTime) / 1000;
-
-      return {
-        videoUrl,
-        generationTimeSeconds,
-        costUsd: COST_PER_VIDEO_USD,
-        fullPrompt: textPrompt,
-      };
-    } else if (statusData.status === 'failed') {
-      const errorMsg = statusData.error?.message || 'Error desconocido';
-      throw new Error(`Generación de video falló: ${errorMsg}`);
-    }
-
-    attempts++;
+  const data = (await res.json()) as H3JobResponse;
+  if (!data.job_id) {
+    throw new Error(`Respuesta de H3 sin job_id: ${JSON.stringify(data)}`);
   }
-
-  throw new Error('Timeout esperando generación de video (5 minutos)');
+  console.log(`[Video Service/H3] Job encolado: ${data.job_id} (status ${data.status})`);
+  return { jobId: data.job_id, fullPrompt };
 }
 
 /**
- * Download video from URL and return as Buffer
+ * Consulta el estado de un job H3 (una sola llamada, sin polling). El polling lo hace el cliente
+ * llamando al route de sync bajo demanda (no bloquea ninguna request de servidor).
+ */
+export async function getJobStatus(jobId: string): Promise<H3JobStatusResult> {
+  ensureConfigured();
+  const res = await fetch(`${H3_BASE_URL}/v1/jobs/${jobId}`, { headers: authHeaders() });
+  if (!res.ok) {
+    throw new Error(`Error consultando job H3 ${jobId}: ${res.status}`);
+  }
+  const job = (await res.json()) as H3JobResponse;
+  return {
+    status: job.status,
+    videoUrl: job.video_url,
+    generationTimeSeconds: job.generation_time_seconds,
+    error: job.error || undefined,
+  };
+}
+
+/**
+ * Descarga el vídeo generado. El video_url de H3 requiere la X-API-Key.
  */
 export async function downloadVideo(url: string): Promise<Buffer> {
-  const response = await fetch(url);
+  const isH3 = url.startsWith(H3_BASE_URL);
+  const response = await fetch(url, isH3 ? { headers: authHeaders() } : undefined);
   if (!response.ok) {
-    throw new Error(`Error descargando video: ${response.status}`);
+    throw new Error(`Error descargando vídeo: ${response.status}`);
   }
   const arrayBuffer = await response.arrayBuffer();
   return Buffer.from(arrayBuffer);

src/types/project.ts

@@ -216,6 +216,8 @@ export interface ReferenceAsset {
   emotionUrl?: string;
 }
 
+export type VideoVariationStatus = 'queued' | 'processing' | 'ready' | 'error';
+
 export interface VideoVariation {
   id: string;
   planoId: string;
@@ -227,6 +229,10 @@ export interface VideoVariation {
   costUsd?: number;
   isSelected: boolean;
   createdAt: string;
+  // Generación async (H3): estado del job y su id remoto.
+  status: VideoVariationStatus;
+  h3JobId?: string;
+  error?: string;
 }
 
 export interface PlanoConPrompt extends PlanoEscaleta {