diff --git a/README.md b/README.md
index e2f64c8b..6bed8670 100644
--- a/README.md
+++ b/README.md
@@ -72,12 +72,6 @@ Bililive-go是一个支持多种直播平台的直播录制工具
         <td>滋瓷</td>
         <td></td>
     </tr>
-    <tr align="center">
-        <td>twitch</td>
-        <td>www.twitch.tv</td>
-        <td>TODO</td>
-        <td></td>
-    </tr>
     <tr align="center">
         <td>OPENREC</td>
         <td>www.openrec.tv</td>
@@ -120,12 +114,6 @@ Bililive-go是一个支持多种直播平台的直播录制工具
         <td>滋瓷</td>
         <td></td>
     </tr>
-    <tr align="center">
-        <td>快手</td>
-        <td>live.kuaishou.com</td>
-        <td>滋瓷(不稳定)</td>
-        <td>滋瓷</td>
-    </tr>
     <tr align="center">
         <td>YY直播</td>
         <td>www.yy.com</td>
diff --git a/src/pkg/parser/ffmpeg/ffmpeg.go b/src/pkg/parser/ffmpeg/ffmpeg.go
index 7147ba83..f7c23b33 100644
--- a/src/pkg/parser/ffmpeg/ffmpeg.go
+++ b/src/pkg/parser/ffmpeg/ffmpeg.go
@@ -55,6 +55,7 @@ type Parser struct {
 
 	statusReq  chan struct{}
 	statusResp chan map[string]string
+	cmdLock    sync.Mutex
 }
 
 func (p *Parser) scanFFmpegStatus() <-chan []byte {
@@ -166,20 +167,30 @@ func (p *Parser) ParseLiveStream(ctx context.Context, url *url.URL, live live.Li
 	}
 
 	args = append(args, file)
-	p.cmd = exec.Command(ffmpegPath, args...)
-	if p.cmdStdIn, err = p.cmd.StdinPipe(); err != nil {
-		return err
-	}
-	if p.cmdStdout, err = p.cmd.StdoutPipe(); err != nil {
-		return err
-	}
-	if p.debug {
-		p.cmd.Stderr = os.Stderr
-	}
-	if err = p.cmd.Start(); err != nil {
-		p.cmd.Process.Kill()
+
+	// p.cmd operations need p.cmdLock
+	func() {
+		p.cmdLock.Lock()
+		defer p.cmdLock.Unlock()
+		p.cmd = exec.Command(ffmpegPath, args...)
+		if p.cmdStdIn, err = p.cmd.StdinPipe(); err != nil {
+			return
+		}
+		if p.cmdStdout, err = p.cmd.StdoutPipe(); err != nil {
+			return
+		}
+		if p.debug {
+			p.cmd.Stderr = os.Stderr
+		}
+		if err = p.cmd.Start(); err != nil {
+			p.cmd.Process.Kill()
+			return
+		}
+	}()
+	if err != nil {
 		return err
 	}
+
 	go p.scheduler()
 	err = p.cmd.Wait()
 	if err != nil {
@@ -190,6 +201,8 @@ func (p *Parser) ParseLiveStream(ctx context.Context, url *url.URL, live live.Li
 
 func (p *Parser) Stop() (err error) {
 	p.closeOnce.Do(func() {
+		p.cmdLock.Lock()
+		defer p.cmdLock.Unlock()
 		if p.cmd.ProcessState == nil {
 			if p.cmdStdIn != nil && p.cmd.Process != nil {
 				if _, err = p.cmdStdIn.Write([]byte("q")); err != nil {