diff --git a/api/ChunkVideo.js b/api/ChunkVideo.js
index 175eb4a..af9fb2a 100644
--- a/api/ChunkVideo.js
+++ b/api/ChunkVideo.js
@@ -154,7 +154,7 @@ export default class ChunkVideo extends VideoChunk {
     async #synthesize() {
         const page = await this.#acquirePage();
         try {
-            const { url, content, width, height, fps, startTime, duration, pageWaitForOptions, pageViewport = {} } = this;
+            const { url, content, width, height, pageWaitForOptions, pageViewport = {} } = this;
             // 监听页面实例发生的某些内部错误
             page.on("error", err => this._emitError("Page error:\n" + err.stack));
             // 监听页面是否崩溃，当内存不足或过载时可能会崩溃
@@ -207,9 +207,9 @@ export default class ChunkVideo extends VideoChunk {
             page.on("frame", buffer => this.input(buffer));
             // 启动捕获
             await page.startScreencast({
-                fps,
-                startTime,
-                duration,
+                fps: this.fps,
+                startTime: this.startTime,
+                duration: this.duration,
                 autostart: this.autostartRender
             });
             // 监听并等待录制完成
diff --git a/api/SingleVideo.js b/api/SingleVideo.js
index d6124f1..0d886be 100644
--- a/api/SingleVideo.js
+++ b/api/SingleVideo.js
@@ -151,7 +151,7 @@ export default class SingleVideo extends Synthesizer {
     async #synthesize() {
         const page = await this.#acquirePage();
         try {
-            const { url, content, width, height, fps, startTime, duration, pageWaitForOptions, pageViewport = {} } = this;
+            const { url, content, width, height, pageWaitForOptions, pageViewport = {} } = this;
             // 监听页面实例发生的某些内部错误
             page.on("error", err => this._emitError("Page error:\n" + err.stack));
             // 监听页面是否崩溃，当内存不足或过载时可能会崩溃
@@ -199,9 +199,9 @@ export default class SingleVideo extends Synthesizer {
             page.on("frame", buffer => this.input(buffer));
             // 启动捕获
             await page.startScreencast({
-                fps,
-                startTime,
-                duration,
+                fps: this.fps,
+                startTime: this.startTime,
+                duration: this.duration,
                 autostart: this.autostartRender
             });
             // 监听并等待录制完成
diff --git a/core/Synthesizer.js b/core/Synthesizer.js
index 21e3484..cbbc99d 100644
--- a/core/Synthesizer.js
+++ b/core/Synthesizer.js
@@ -214,6 +214,7 @@ export default class Synthesizer extends EventEmitter {
         assert(this.isReady(), "Synthesizer status is not READY, please reset the synthesizer: synthesizer.reset()");
         this.#setState(Synthesizer.STATE.SYNTHESIZING);
         this._startupTime = _.defaultTo(this._startupTime, performance.now());
+        this._targetFrameCount = util.durationToFrameCount(this.duration, this.fps);
         (async () => {
             await fs.ensureDir(path.dirname(this.outputPath));
             await fs.ensureDir(this.tmpDirPath);