From 892734bfd83aaef726b6d772c9e97a217a87e698 Mon Sep 17 00:00:00 2001
From: xiongziliang <771730766@qq.com>
Date: Fri, 2 Aug 2019 11:54:05 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AE=8C=E5=96=84?=
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---
 src/MediaFile/MP4Muxer.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/MediaFile/MP4Muxer.cpp b/src/MediaFile/MP4Muxer.cpp
index cedc7c4f..076cc86c 100644
--- a/src/MediaFile/MP4Muxer.cpp
+++ b/src/MediaFile/MP4Muxer.cpp
@@ -79,11 +79,13 @@ void MP4Muxer::onTrackFrame(const Frame::Ptr &frame) {
         return;
     }
 
-    if(frame->getTrackType() == TrackVideo){
-        if(!_started && !frame->keyFrame()){
-            //第一帧必须是I帧，防止花屏
+    if(!_started){
+        //还没开始
+        if(frame->getTrackType() != TrackVideo || !frame->keyFrame()){
+            //如果首帧是音频或者是视频但是不是i帧，那么不能开始写文件
             return;
         }
+        //开始写文件
         _started = true;
     }