diff --git a/README.md b/README.md
index 0c82f04..4b0b1af 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,6 @@
 
 ## 实现说明
 * download.go 大部分抄自 https://github.com/llychao/m3u8-downloader
-* <del>将ffmpeg直接编译进windows/linux-arm/linux-386/darwin的二进制了.
-  转换mp4时,会自动将二进制里的ffmpeg解压到系统临时目录,然后使用.
-  因此linux/mac版本的可执行文件达到了32MB, 带Qt ui的可执行文件达到了惊人的 50MB</del>
 * 使用 https://github.com/yapingcat/gomedia 代替ffmpeg进行格式转换
 * 支持跳过前面几个ts文件(一般是广告, 嘿嘿)
 * 程序会在下载保存目录创建:
@@ -24,7 +21,7 @@
   * [x] 如果不是m3u8样子的URL，自动下载html下来、搜索其中的m3u8链接进行下载
   * [x] windows、linux、mac都支持ffmpeg合并ts列表为mp4
   * [x] 充分测试后，使用 https://github.com/yapingcat/gomedia 代替ffmpeg进行格式转换
-  * [ ] 支持嵌套m3u8的url
+  * [x] 支持嵌套m3u8的url
   * [ ] 支持设置代理
   * [ ] 支持从curl命令解析出需要的header、auth-basic、cookie等信息，正如 https://github.com/cxjava/m3u8-downloader 一样
 ## 二次开发操作手册:
diff --git a/download.go b/download.go
index 25d4135..0ca496d 100644
--- a/download.go
+++ b/download.go
@@ -110,7 +110,8 @@ func (this *downloadEnv) RunDownload(req RunDownload_Req) (resp RunDownload_Resp
 		"Referer":         []string{host},
 	}
 	SetProgressBarTitle("嗅探m3u8")
-	req.M3u8Url, err = this.sniffM3u8(req.M3u8Url)
+	var m3u8Body []byte
+	req.M3u8Url, m3u8Body, err = this.sniffM3u8(req.M3u8Url)
 	if err != nil {
 		resp.ErrMsg = "sniffM3u8: " + err.Error()
 		resp.IsCancel = this.GetIsCancel()
@@ -154,12 +155,6 @@ func (this *downloadEnv) RunDownload(req RunDownload_Req) (resp RunDownload_Resp
 		return resp
 	}
 	// 获取m3u8地址的内容体
-	m3u8Body, err := this.doGetRequest(req.M3u8Url)
-	if err != nil {
-		resp.ErrMsg = "getM3u8Body: " + err.Error()
-		resp.IsCancel = this.GetIsCancel()
-		return resp
-	}
 	ts_key, err := this.getM3u8Key(m3u8Host, string(m3u8Body))
 	if err != nil {
 		resp.ErrMsg = "getM3u8Key: " + err.Error()
@@ -194,6 +189,7 @@ func (this *downloadEnv) RunDownload(req RunDownload_Req) (resp RunDownload_Resp
 	err = MergeTsFileListToSingleMp4(MergeTsFileListToSingleMp4_Req{
 		TsFileList: tsFileList,
 		OutputMp4:  tmpOutputName,
+		ctx:        this.ctx,
 	})
 	if err != nil {
 		resp.ErrMsg = "合并错误: " + err.Error()
@@ -241,6 +237,7 @@ func (this *downloadEnv) RunDownload(req RunDownload_Req) (resp RunDownload_Resp
 		resp.ErrMsg = "删除下载目录失败: " + err.Error()
 		return resp
 	}
+	_ = os.Remove(filepath.Join(req.SaveDir, "downloading"))
 	SetProgressBarTitle("下载进度")
 	return resp
 }
@@ -267,7 +264,10 @@ func RunDownload(req RunDownload_Req) (resp RunDownload_Resp) {
 	}
 	gOldEnv = env
 	gOldEnvLocker.Unlock()
-	return env.RunDownload(req)
+	resp = env.RunDownload(req)
+	SetProgressBarTitle("下载进度")
+	DrawProgressBar(1, 0)
+	return resp
 }
 
 func CloseOldEnv() {
@@ -522,19 +522,52 @@ func getFileSha256(targetFile string) (v string) {
 	return hex.EncodeToString(tmp[:])
 }
 
-func (this *downloadEnv) sniffM3u8(urlS string) (afterUrl string, err error) {
-	if strings.HasSuffix(strings.ToLower(urlS), ".m3u8") {
-		return urlS, nil
+func (this *downloadEnv) sniffM3u8(urlS string) (afterUrl string, content []byte, err error) {
+	for idx := 0; idx < 5; idx++ {
+		content, err = this.doGetRequest(urlS)
+		if err != nil {
+			return "", nil, err
+		}
+		if strings.HasSuffix(strings.ToLower(urlS), ".m3u8") {
+			// 看这个是不是嵌套的m3u8
+			var m3u8Url string
+			containsTs := false
+			for _, line := range strings.Split(string(content), "\n") {
+				lineOrigin := strings.TrimSpace(line)
+				line = strings.ToLower(lineOrigin)
+				if strings.HasSuffix(line, ".m3u8") {
+					m3u8Url = lineOrigin
+					break
+				}
+				if strings.HasSuffix(line, ".ts") {
+					containsTs = true
+					break
+				}
+			}
+			if containsTs {
+				return urlS, content, err
+			}
+			if m3u8Url == "" {
+				return "", nil, errors.New("未发现m3u8资源_1")
+			}
+			urlObj, err := url.Parse(urlS)
+			if err != nil {
+				return "", nil, err
+			}
+			lineObj, err := url.Parse(m3u8Url)
+			if err != nil {
+				return "", nil, err
+			}
+			urlS = urlObj.ResolveReference(lineObj).String()
+			continue
+		}
+		groups := regexp.MustCompile(`http[s]://[a-zA-Z0-9/\\.%_-]+.m3u8`).FindSubmatch(content)
+		if len(groups) == 0 {
+			return "", nil, errors.New("未发现m3u8资源_2")
+		}
+		urlS = string(groups[0])
 	}
-	content, err := this.doGetRequest(urlS)
-	if err != nil {
-		return "", err
-	}
-	groups := regexp.MustCompile(`http[s]://[a-zA-Z0-9/\\.%_-]+.m3u8`).FindSubmatch(content)
-	if len(groups) == 0 {
-		return "", errors.New("未发现m3u8资源")
-	}
-	return string(groups[0]), nil
+	return "", nil, errors.New("未发现m3u8资源_3")
 }
 
 func (this *downloadEnv) doGetRequest(urlS string) (data []byte, err error) {
diff --git a/export/main.go b/export/main.go
index 0186ddd..28c7852 100644
--- a/export/main.go
+++ b/export/main.go
@@ -10,7 +10,7 @@ import (
 )
 
 func main() {
-	BuildCliBinary()   // 编译二进制
+	//BuildCliBinary()   // 编译二进制
 	CreateLibForQtUi() // 创建Qt需要使用的.a库文件
 }
 
diff --git a/m3u8d-qt/mainwindow.cpp b/m3u8d-qt/mainwindow.cpp
index f04f7b3..ed8f2b5 100644
--- a/m3u8d-qt/mainwindow.cpp
+++ b/m3u8d-qt/mainwindow.cpp
@@ -35,7 +35,6 @@ void MainWindow::on_pushButton_RunDownload_clicked()
     ui->pushButton_RunDownload->setEnabled(false);
     ui->checkBox_Insecure->setEnabled(false);
     ui->progressBar->setValue(0);
-//    ui->pushButton_RunDownload->setText("正在下载...");
     ui->pushButton_StopDownload->setEnabled(true);
 
     m_syncUi.AddRunFnOn_OtherThread([this](){
@@ -45,9 +44,9 @@ void MainWindow::on_pushButton_RunDownload_clicked()
         while(isFinished->load() == false)
         {
             QThread::msleep(50);
-            GetProgress_Resp resp = GetProgress();
             // 可能以下闭包在运行前, other thread已经退出了, 所以isFinished需要使用shared_ptr
-            m_syncUi.AddRunFnOn_UiThread([resp, this, isFinished](){
+            m_syncUi.AddRunFnOn_UiThread([this, isFinished](){
+                GetProgress_Resp resp = GetProgress();
                 ui->progressBar->setValue(resp.Percent);
                 ui->label_progressBar->setText(QString::fromStdString(resp.Title));
                 if (ui->pushButton_RunDownload->isEnabled()) {
diff --git a/m3u8d-qt/mainwindow.ui b/m3u8d-qt/mainwindow.ui
index 3db0f42..6da1585 100644
--- a/m3u8d-qt/mainwindow.ui
+++ b/m3u8d-qt/mainwindow.ui
@@ -63,7 +63,11 @@
        </widget>
       </item>
       <item row="0" column="2">
-       <widget class="QLineEdit" name="lineEdit_M3u8Url"/>
+       <widget class="QLineEdit" name="lineEdit_M3u8Url">
+        <property name="text">
+         <string/>
+        </property>
+       </widget>
       </item>
       <item row="1" column="2">
        <widget class="QLineEdit" name="lineEdit_SaveDir"/>
diff --git a/merge.go b/merge.go
index be11b91..b3909ce 100644
--- a/merge.go
+++ b/merge.go
@@ -2,6 +2,7 @@ package m3u8d
 
 import (
 	"bytes"
+	"context"
 	"errors"
 	"github.com/yapingcat/gomedia/mp4"
 	"github.com/yapingcat/gomedia/mpeg2"
@@ -13,6 +14,7 @@ import (
 type MergeTsFileListToSingleMp4_Req struct {
 	TsFileList []string
 	OutputMp4  string
+	ctx        context.Context
 }
 
 func MergeTsFileListToSingleMp4(req MergeTsFileListToSingleMp4_Req) (err error) {
@@ -42,6 +44,11 @@ func MergeTsFileListToSingleMp4(req MergeTsFileListToSingleMp4_Req) (err error)
 	}
 
 	for idx, tsFile := range req.TsFileList {
+		select {
+		case <-req.ctx.Done():
+			return req.ctx.Err()
+		default:
+		}
 		DrawProgressBar(len(req.TsFileList), idx)
 		var buf []byte
 		buf, err = ioutil.ReadFile(tsFile)