diff --git a/include/media/stagefright/MPEG4Writer.h b/include/media/stagefright/MPEG4Writer.h
index de82b38..2412f6a 100644
--- a/include/media/stagefright/MPEG4Writer.h
+++ b/include/media/stagefright/MPEG4Writer.h
@@ -40,6 +40,7 @@
     virtual status_t stop();
     virtual status_t pause();
     virtual bool reachedEOS();
+    virtual status_t dump(int fd, const Vector<String16>& args);
 
     void beginBox(const char *fourcc);
     void writeInt8(int8_t x);
diff --git a/include/media/stagefright/MediaWriter.h b/include/media/stagefright/MediaWriter.h
index 151bf16..5cc8dcf 100644
--- a/include/media/stagefright/MediaWriter.h
+++ b/include/media/stagefright/MediaWriter.h
@@ -44,6 +44,10 @@
         mListener = listener;
     }
 
+    virtual status_t dump(int fd, const Vector<String16>& args) {
+        return OK;
+    }
+
 protected:
     virtual ~MediaWriter() {}
     int64_t mMaxFileSizeLimitBytes;
diff --git a/media/libmediaplayerservice/StagefrightRecorder.cpp b/media/libmediaplayerservice/StagefrightRecorder.cpp
index 796731b..cf01ff6 100644
--- a/media/libmediaplayerservice/StagefrightRecorder.cpp
+++ b/media/libmediaplayerservice/StagefrightRecorder.cpp
@@ -1162,11 +1162,19 @@
     return OK;
 }
 
-status_t StagefrightRecorder::dump(int fd, const Vector<String16>& args) const {
+status_t StagefrightRecorder::dump(
+        int fd, const Vector<String16>& args) const {
+    LOGV("dump");
     const size_t SIZE = 256;
     char buffer[SIZE];
     String8 result;
-    snprintf(buffer, SIZE, "   Recorder: %p", this);
+    if (mWriter != 0) {
+        mWriter->dump(fd, args);
+    } else {
+        snprintf(buffer, SIZE, "   No file writer\n");
+        result.append(buffer);
+    }
+    snprintf(buffer, SIZE, "   Recorder: %p\n", this);
     snprintf(buffer, SIZE, "   Output file (fd %d):\n", mOutputFd);
     result.append(buffer);
     snprintf(buffer, SIZE, "     File format: %d\n", mOutputFormat);
diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index 568037e..e36d9fe 100644
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -60,6 +60,7 @@
     bool isAudio() const { return mIsAudio; }
     bool isMPEG4() const { return mIsMPEG4; }
     void addChunkOffset(off_t offset) { mChunkOffsets.push_back(offset); }
+    status_t dump(int fd, const Vector<String16>& args) const;
 
 private:
     MPEG4Writer *mOwner;
@@ -217,6 +218,37 @@
     mTracks.clear();
 }
 
+status_t MPEG4Writer::dump(
+        int fd, const Vector<String16>& args) {
+    const size_t SIZE = 256;
+    char buffer[SIZE];
+    String8 result;
+    snprintf(buffer, SIZE, "   MPEG4Writer %p\n", this);
+    result.append(buffer);
+    snprintf(buffer, SIZE, "     mStarted: %s\n", mStarted? "true": "false");
+    result.append(buffer);
+    ::write(fd, result.string(), result.size());
+    for (List<Track *>::iterator it = mTracks.begin();
+         it != mTracks.end(); ++it) {
+        (*it)->dump(fd, args);
+    }
+    return OK;
+}
+
+status_t MPEG4Writer::Track::dump(
+        int fd, const Vector<String16>& args) const {
+    const size_t SIZE = 256;
+    char buffer[SIZE];
+    String8 result;
+    snprintf(buffer, SIZE, "     %s track\n", mIsAudio? "Audio": "Video");
+    result.append(buffer);
+    snprintf(buffer, SIZE, "       reached EOS: %s\n",
+            mReachedEOS? "true": "false");
+    result.append(buffer);
+    ::write(fd, result.string(), result.size());
+    return OK;
+}
+
 status_t MPEG4Writer::addSource(const sp<MediaSource> &source) {
     Track *track = new Track(this, source);
     mTracks.push_back(track);