diff --git a/src/modules/summary/SummaryController.ts b/src/modules/summary/SummaryController.ts
index 796f717..3de38de 100644
--- a/src/modules/summary/SummaryController.ts
+++ b/src/modules/summary/SummaryController.ts
@@ -1,5 +1,5 @@
 import { RouteHandlerMethod } from 'fastify';
-import {CreateSummarizerParams} from '@modal-sh/webvideo-transcript-summary-core';
+import {CreateSummarizerParams, SummarizerProcessParams} from '@modal-sh/webvideo-transcript-summary-core';
 import * as config from '../../config';
 import { SummaryService, SummaryServiceImpl } from './SummaryService';
 
@@ -15,10 +15,9 @@ export class SummaryControllerImpl implements SummaryController {
   }
 
   readonly summarizeVideoTranscript: RouteHandlerMethod = async (request, reply) => {
-    const params = request.body as CreateSummarizerParams;
+    const params = request.body as CreateSummarizerParams & SummarizerProcessParams;
     try {
-      const summaryResult = await this.summaryService.summarizeVideoTranscript({
-        url: params.url,
+      this.summaryService.initializeSummarizer({
         type: params.type,
         openAiParams: {
           apiKey: config.openAi.apiKey,
@@ -26,9 +25,15 @@ export class SummaryControllerImpl implements SummaryController {
           temperature: params.openAiParams?.temperature ?? 0.6,
           model: params.openAiParams?.model ?? 'gpt-3.5-turbo',
         },
-        language: params.language ?? 'en',
-        country: params.country ?? 'US',
       });
+
+      const summaryResult = await this.summaryService.summarizeVideoTranscript(
+        {
+          url: params.url,
+          language: params.language ?? 'en',
+          country: params.country ?? 'US',
+        },
+      );
       reply.send(summaryResult);
     } catch (errRaw) {
       const err = errRaw as Error;
diff --git a/src/modules/summary/SummaryService.ts b/src/modules/summary/SummaryService.ts
index 489e2b0..a7f0f7d 100644
--- a/src/modules/summary/SummaryService.ts
+++ b/src/modules/summary/SummaryService.ts
@@ -1,7 +1,7 @@
 import {
   createSummarizer,
-  CreateSummarizerParams,
-  VideoType,
+  CreateSummarizerParams, SummarizerEventEmitter,
+  SummarizerProcessParams,
 } from '@modal-sh/webvideo-transcript-summary-core';
 
 export interface SummaryResult {
@@ -11,21 +11,32 @@ export interface SummaryResult {
 }
 
 export interface SummaryService {
-  summarizeVideoTranscript(params: CreateSummarizerParams): Promise<Partial<SummaryResult>>
+  initializeSummarizer(params: CreateSummarizerParams): void;
+  summarizeVideoTranscript(processParams: SummarizerProcessParams): Promise<Partial<SummaryResult>>;
 }
 
 export class SummaryServiceImpl implements SummaryService {
+  private summarizer?: SummarizerEventEmitter;
+
   constructor(private readonly logger = console) {
     // noop
   }
 
-  summarizeVideoTranscript(params: CreateSummarizerParams) {
+  initializeSummarizer(params: CreateSummarizerParams): void {
+    this.summarizer = createSummarizer(params);
+  }
+
+  summarizeVideoTranscript(processParams: SummarizerProcessParams) {
     return new Promise<Partial<SummaryResult>>((resolve, reject) => {
+      if (!this.summarizer) {
+        reject(new Error('Summarizer is not initialized'));
+        return;
+      }
+
       const successEvent = {} as Partial<SummaryResult>;
       let error: Error;
-      const summarizer = createSummarizer(params);
 
-      summarizer.on('process', (data) => {
+      this.summarizer.on('process', (data) => {
         this.logger.log('process', data);
         if (data.phase === 'success') {
           switch (data.processType) {
@@ -47,12 +58,12 @@ export class SummaryServiceImpl implements SummaryService {
         }
       });
 
-      summarizer.on('error', (err) => {
+      this.summarizer.on('error', (err) => {
         this.logger.log('error', err);
         error = err;
       });
 
-      summarizer.on('end', () => {
+      this.summarizer.on('end', () => {
         this.logger.log('end');
         if (error) {
           reject(error);
@@ -61,7 +72,7 @@ export class SummaryServiceImpl implements SummaryService {
         resolve(successEvent);
       });
 
-      summarizer.process();
+      this.summarizer.process(processParams);
     });
   }
 }