diff --git a/media/libmediaplayerservice/StagefrightRecorder.cpp b/media/libmediaplayerservice/StagefrightRecorder.cpp
index 3e3872d..624f596 100644
--- a/media/libmediaplayerservice/StagefrightRecorder.cpp
+++ b/media/libmediaplayerservice/StagefrightRecorder.cpp
@@ -402,12 +402,11 @@
 
     // start with a clean, empty file
     ftruncate(fd, 0);
-    int nextFd = dup(fd);
     if (mWriter == NULL) {
         ALOGE("setNextOutputFile failed. Writer has been freed");
         return INVALID_OPERATION;
     }
-    return mWriter->setNextFd(nextFd);
+    return mWriter->setNextFd(fd);
 }
 
 // Attempt to parse an float literal optionally surrounded by whitespace,
diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index f6ed0f1..a52da45 100644
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -460,7 +460,7 @@
 };
 
 MPEG4Writer::MPEG4Writer(int fd) {
-    initInternal(fd, true /*isFirstSession*/);
+    initInternal(dup(fd), true /*isFirstSession*/);
 }
 
 MPEG4Writer::~MPEG4Writer() {
@@ -481,7 +481,7 @@
 
 void MPEG4Writer::initInternal(int fd, bool isFirstSession) {
     ALOGV("initInternal");
-    mFd = dup(fd);
+    mFd = fd;
     mNextFd = -1;
     mInitCheck = mFd < 0? NO_INIT: OK;
 
@@ -1044,6 +1044,10 @@
 void MPEG4Writer::release() {
     close(mFd);
     mFd = -1;
+    if (mNextFd != -1) {
+        close(mNextFd);
+        mNextFd = -1;
+    }
     mInitCheck = NO_INIT;
     mStarted = false;
     free(mInMemoryCache);
@@ -1981,7 +1985,7 @@
         // No need to set a new FD yet.
         return INVALID_OPERATION;
     }
-    mNextFd = fd;
+    mNextFd = dup(fd);
     return OK;
 }
 
@@ -2180,11 +2184,11 @@
     switch (msg->what()) {
         case kWhatSwitch:
         {
-            finishCurrentSession();
             mLock.lock();
             int fd = mNextFd;
             mNextFd = -1;
             mLock.unlock();
+            finishCurrentSession();
             initInternal(fd, false /*isFirstSession*/);
             start(mStartMeta.get());
             mSwitchPending = false;