diff --git a/README.md b/README.md
index f16aa77..5fbff44 100644
--- a/README.md
+++ b/README.md
@@ -21,15 +21,18 @@
 
 ## 参数
 ```javascript
-//自动快进
-evanEnv.enableAutoForward = true
+//快进抓取
+jsMedia.setSpeed(10);
 //完成后自动下载
-evanEnv.enableAutoDownload = true
+jsMedia.enableAutoDownload = true;
+//手工触发下载
+jsMedia.download();
 ```
 
 ## FFmpeg合并示例
 ```shell
-ffmpeg -i mediasource_0_0_0.mp4 -i mediasource_0_1_0.mp4 -c copy -bsf:a aac_adtstoasc out.mp4
+ffmpeg -i audio.mp4 -acodec copy audio.aac
+ffmpeg -i audio.aac -i video.mp4 -c copy -bsf:a aac_adtstoasc out.mp4
 ```
 
 ## 大文件分段需要先文件合并
@@ -37,9 +40,5 @@ ffmpeg -i mediasource_0_0_0.mp4 -i mediasource_0_1_0.mp4 -c copy -bsf:a aac_adts
 copy /b mediasource_0_0_*.mp4 out.mp4
 ```
 
-## 常见问题
-- 合并后声音播放不正常:由于部分网站使用了HE-AAC v2(AAC+SBR+PS)作为音频编码,大部分播放器还不支持此音频流格式,故声音不正常,使用Windows自带的视频播放器播放正常
-
-
 ## 特别说明
 - 仅限内部交流使用,请勿用于非法用途
\ No newline at end of file
diff --git a/downloadMedia.js b/downloadMedia.js
index d907510..967090a 100644
--- a/downloadMedia.js
+++ b/downloadMedia.js
@@ -12,14 +12,13 @@
 // @grant        none
 // ==/UserScript==
 
-evanEnv = new Object();
-evanEnv.mediaSources = [];
-evanEnv.enableAutoForward = true;
-evanEnv.enableAutoDownload = true;
+jsMedia = new Object();
+jsMedia.mediaSources = [];
+jsMedia.enableAutoDownload = true;
 
 (function () {
-    evanEnv.videos = document.getElementsByTagName('video');
-    evanEnv.downloadRawData = function (bufferList, fileName = 'out', ext = '.mp4') {
+    jsMedia.videos = document.getElementsByTagName('video');
+    jsMedia.downloadRawData = function (bufferList, fileName = 'out', ext = '.mp4') {
         var buffList = new Array();
         var totalLength = 0;
 
@@ -59,36 +58,42 @@ evanEnv.enableAutoDownload = true;
 
     };
 
-    evanEnv.download = function () {
-        for (var i = 0; i < evanEnv.mediaSources.length; i++) {
-            var currentItem = evanEnv.mediaSources[i];
+    jsMedia.download = function () {
+        for (var i = 0; i < jsMedia.mediaSources.length; i++) {
+            var currentItem = jsMedia.mediaSources[i];
             if (currentItem.downloaded == undefined || currentItem.downloaded == false) {
                 for (var x = 0; x < currentItem.rawSources.length; x++) {
-                    evanEnv.downloadRawData(currentItem.rawSources[x], 'mediasource_' + i + '_' + x);
+                    jsMedia.downloadRawData(currentItem.rawSources[x], 'mediasource_' + i + '_' + x);
                 }
             }
             currentItem.downloaded = true;
         }
     };
-    evanEnv.downloadMediaSource = function (mediaSource) {
+    jsMedia.downloadMediaSource = function (mediaSource) {
         for (var x = 0; x < mediaSource.rawSources.length; x++) {
-            evanEnv.downloadRawData(mediaSource.rawSources[x], 'mediasource_' + x);
+            jsMedia.downloadRawData(mediaSource.rawSources[x], 'mediasource_' + x);
             mediaSource.downloaded = true;
         }
     };
 
+    jsMedia.setSpeed = function (speed) {
+        for (let i = 0, length = jsMedia.videos.length; i < length; i++) {
+            jsMedia.videos[i].playbackRate = 10;
+        }
+    };
+
     var proxy_addSourceBuffer = MediaSource.prototype.addSourceBuffer;
     MediaSource.prototype.addSourceBuffer = function (mimeType) {
         var mediaSourceThis = this;
 
-        evanEnv.mediaSources.push(this);
+        jsMedia.mediaSources.push(this);
         this.lastPos = 0;
-        if (evanEnv.enableAutoDownload) {
+        if (jsMedia.enableAutoDownload) {
             this.onsourceended = function () {
-                evanEnv.download();
+                jsMedia.download();
             };
             this.onsourceclose = function () {
-                evanEnv.downloadMediaSource(this);
+                jsMedia.downloadMediaSource(this);
             };
         }
 
@@ -100,17 +105,6 @@ evanEnv.enableAutoDownload = true;
         var buffList = [];
         this.rawSources.push(buffList);
         retSourceBuffer.rawData = buffList;
-        if (evanEnv.enableAutoForward) {
-            retSourceBuffer.onupdate = function () {
-                if (this.buffered != this.buffered.length > 0) {
-                    var endPos = this.buffered.end(0);
-                    if (endPos > 5 && endPos - mediaSourceThis.lastPos > 25) {
-                        evanEnv.videos[0].currentTime = endPos - 3;
-                        mediaSourceThis.lastPos = evanEnv.videos[0].currentTime;
-                    }
-                }
-            };
-        }
         return retSourceBuffer;
     };
     var proxy_appendBuffer = SourceBuffer.prototype.appendBuffer;