diff --git a/cmds/stagefright/record.cpp b/cmds/stagefright/record.cpp
index f8b2f68..9aa0156 100644
--- a/cmds/stagefright/record.cpp
+++ b/cmds/stagefright/record.cpp
@@ -215,7 +215,7 @@
     enc_meta->setInt32("width", width);
     enc_meta->setInt32("height", height);
     enc_meta->setInt32("sample-rate", kFramerate);
-    enc_meta->setInt32("bit-rate", kVideoBitRate);
+    enc_meta->setInt32("bitrate", kVideoBitRate);
     // enc_meta->setInt32("stride", width);
     // enc_meta->setInt32("slice-height", height);
     enc_meta->setInt32("i-frame-interval", kIFramesIntervalSec);
diff --git a/include/media/stagefright/MetaData.h b/include/media/stagefright/MetaData.h
index ba375a2..6493a5e 100644
--- a/include/media/stagefright/MetaData.h
+++ b/include/media/stagefright/MetaData.h
@@ -52,6 +52,7 @@
     kKeyPcmEncoding       = 'PCMe',  // int32_t (audio encoding enum)
     kKeyFrameRate         = 'frmR',  // int32_t (video frame rate fps)
     kKeyBitRate           = 'brte',  // int32_t (bps)
+    kKeyMaxBitRate        = 'mxBr',  // int32_t (bps)
     kKeyESDS              = 'esds',  // raw data
     kKeyAACProfile        = 'aacp',  // int32_t
     kKeyAVCC              = 'avcc',  // raw data
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
index 4ae8e82..e59a498 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
@@ -1770,7 +1770,7 @@
                     mime.c_str(), audioFormat);
 
             int avgBitRate = -1;
-            format->findInt32("bit-rate", &avgBitRate);
+            format->findInt32("bitrate", &avgBitRate);
 
             int32_t aacProfile = -1;
             if (audioFormat == AUDIO_FORMAT_AAC
diff --git a/media/libstagefright/ESDS.cpp b/media/libstagefright/ESDS.cpp
index 8fbb57c..c31720d 100644
--- a/media/libstagefright/ESDS.cpp
+++ b/media/libstagefright/ESDS.cpp
@@ -18,6 +18,8 @@
 #define LOG_TAG "ESDS"
 #include <utils/Log.h>
 
+#include <media/stagefright/Utils.h>
+
 #include "include/ESDS.h"
 
 #include <string.h>
@@ -194,12 +196,25 @@
     return err;
 }
 
+status_t ESDS::getBitRate(uint32_t *brateMax, uint32_t *brateAvg) const {
+    if (mInitCheck != OK) {
+        return mInitCheck;
+    }
+
+    *brateMax = mBitRateMax;
+    *brateAvg = mBitRateAvg;
+
+    return OK;
+};
+
 status_t ESDS::parseDecoderConfigDescriptor(size_t offset, size_t size) {
     if (size < 13) {
         return ERROR_MALFORMED;
     }
 
     mObjectTypeIndication = mData[offset];
+    mBitRateMax = U32_AT(mData + offset + 5);
+    mBitRateAvg = U32_AT(mData + offset + 9);
 
     offset += 13;
     size -= 13;
diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index f296d9a..935f3a9 100644
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -1738,6 +1738,31 @@
             break;
         }
 
+        case FOURCC('b', 't', 'r', 't'):
+        {
+            *offset += chunk_size;
+
+            uint8_t buffer[12];
+            if (chunk_data_size != sizeof(buffer)) {
+                return ERROR_MALFORMED;
+            }
+
+            if (mDataSource->readAt(
+                    data_offset, buffer, chunk_data_size) < chunk_data_size) {
+                return ERROR_IO;
+            }
+
+            uint32_t maxBitrate = U32_AT(&buffer[4]);
+            uint32_t avgBitrate = U32_AT(&buffer[8]);
+            if (maxBitrate > 0 && maxBitrate < INT32_MAX) {
+                mLastTrack->meta->setInt32(kKeyMaxBitRate, (int32_t)maxBitrate);
+            }
+            if (avgBitrate > 0 && avgBitrate < INT32_MAX) {
+                mLastTrack->meta->setInt32(kKeyBitRate, (int32_t)avgBitrate);
+            }
+            break;
+        }
+
         case FOURCC('a', 'v', 'c', 'C'):
         {
             *offset += chunk_size;
diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index db20590..7b98396 100644
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -3057,11 +3057,14 @@
     mOwner->writeInt8(0x15);   // streamType AudioStream
 
     mOwner->writeInt16(0x03);  // XXX
-    mOwner->writeInt8(0x00);   // buffer size 24-bit
-    int32_t bitRate;
-    bool success = mMeta->findInt32(kKeyBitRate, &bitRate);
-    mOwner->writeInt32(success ? bitRate : 96000); // max bit rate
-    mOwner->writeInt32(success ? bitRate : 96000); // avg bit rate
+    mOwner->writeInt8(0x00);   // buffer size 24-bit (0x300)
+
+    int32_t avgBitrate = 256000;
+    (void)mMeta->findInt32(kKeyBitRate, &avgBitrate);
+    int32_t maxBitrate = avgBitrate;
+    (void)mMeta->findInt32(kKeyMaxBitRate, &maxBitrate);
+    mOwner->writeInt32(maxBitrate);
+    mOwner->writeInt32(avgBitrate);
 
     mOwner->writeInt8(0x05);   // DecoderSpecificInfoTag
     mOwner->writeInt8(mCodecSpecificDataSize);
@@ -3095,12 +3098,17 @@
     mOwner->writeInt8(0x11);  // streamType VisualStream
 
     static const uint8_t kData[] = {
-        0x01, 0x77, 0x00,
-        0x00, 0x03, 0xe8, 0x00,
-        0x00, 0x03, 0xe8, 0x00
+        0x01, 0x77, 0x00, // buffer size 96000 bytes
     };
     mOwner->write(kData, sizeof(kData));
 
+    int32_t avgBitrate = 256000;
+    (void)mMeta->findInt32(kKeyBitRate, &avgBitrate);
+    int32_t maxBitrate = avgBitrate;
+    (void)mMeta->findInt32(kKeyMaxBitRate, &maxBitrate);
+    mOwner->writeInt32(maxBitrate);
+    mOwner->writeInt32(avgBitrate);
+
     mOwner->writeInt8(0x05);  // DecoderSpecificInfoTag
 
     mOwner->writeInt8(mCodecSpecificDataSize);
diff --git a/media/libstagefright/Utils.cpp b/media/libstagefright/Utils.cpp
index 3e1badf..a347f00 100644
--- a/media/libstagefright/Utils.cpp
+++ b/media/libstagefright/Utils.cpp
@@ -157,9 +157,14 @@
         msg->setInt64("durationUs", durationUs);
     }
 
-    int avgBitRate;
+    int32_t avgBitRate;
     if (meta->findInt32(kKeyBitRate, &avgBitRate)) {
-        msg->setInt32("bit-rate", avgBitRate);
+        msg->setInt32("bitrate", avgBitRate);
+    }
+
+    int32_t maxBitRate;
+    if (meta->findInt32(kKeyMaxBitRate, &maxBitRate)) {
+        msg->setInt32("max-bitrate", maxBitRate);
     }
 
     int32_t isSync;
@@ -465,6 +470,18 @@
         buffer->meta()->setInt32("csd", true);
         buffer->meta()->setInt64("timeUs", 0);
         msg->setBuffer("csd-0", buffer);
+
+        uint32_t maxBitrate, avgBitrate;
+        if (esds.getBitRate(&maxBitrate, &avgBitrate) == OK) {
+            if (!meta->hasData(kKeyMaxBitRate)
+                    && maxBitrate > 0 && maxBitrate <= INT32_MAX) {
+                msg->setInt32("max-bitrate", (int32_t)maxBitrate);
+            }
+            if (!meta->hasData(kKeyBitRate)
+                    && avgBitrate > 0 && avgBitrate <= INT32_MAX) {
+                msg->setInt32("bitrate", (int32_t)avgBitrate);
+            }
+        }
     } else if (meta->findData(kKeyVorbisInfo, &type, &data, &size)) {
         sp<ABuffer> buffer = new (std::nothrow) ABuffer(size);
         if (buffer.get() == NULL || buffer->base() == NULL) {
@@ -552,11 +569,10 @@
 }
 
 static size_t reassembleAVCC(const sp<ABuffer> &csd0, const sp<ABuffer> csd1, char *avcc) {
-
     avcc[0] = 1;        // version
-    avcc[1] = 0x64;     // profile
-    avcc[2] = 0;        // unused (?)
-    avcc[3] = 0xd;      // level
+    avcc[1] = 0x64;     // profile (default to high)
+    avcc[2] = 0;        // constraints (default to none)
+    avcc[3] = 0xd;      // level (default to 1.3)
     avcc[4] = 0xff;     // reserved+size
 
     size_t i = 0;
@@ -638,15 +654,16 @@
     esds[11] = 0x80 | ((configdescriptorsize >> 7) & 0x7f);
     esds[12] = (configdescriptorsize & 0x7f);
     esds[13] = 0x40; // objectTypeIndication
-    esds[14] = 0x15; // not sure what 14-25 mean, they are ignored by ESDS.cpp,
-    esds[15] = 0x00; // but the actual values here were taken from a real file.
+    // bytes 14-25 are examples from a real file. they are unused/overwritten by muxers.
+    esds[14] = 0x15; // streamType(5), upStream(0),
+    esds[15] = 0x00; // 15-17: bufferSizeDB (6KB)
     esds[16] = 0x18;
     esds[17] = 0x00;
-    esds[18] = 0x00;
+    esds[18] = 0x00; // 18-21: maxBitrate (64kbps)
     esds[19] = 0x00;
     esds[20] = 0xfa;
     esds[21] = 0x00;
-    esds[22] = 0x00;
+    esds[22] = 0x00; // 22-25: avgBitrate (64kbps)
     esds[23] = 0x00;
     esds[24] = 0xfa;
     esds[25] = 0x00;
@@ -657,7 +674,6 @@
     esds[30] = (csd0size & 0x7f);
     memcpy((void*)&esds[31], csd0->data(), csd0size);
     // data following this is ignored, so don't bother appending it
-
 }
 
 static size_t reassembleHVCC(const sp<ABuffer> &csd0, uint8_t *hvcc, size_t hvccSize, size_t nalSizeLength) {
@@ -1059,7 +1075,7 @@
     int32_t brate = -1;
     if (!meta->findInt32(kKeyBitRate, &brate)) {
         ALOGV("track of type '%s' does not publish bitrate", mime);
-     }
+    }
     info.bit_rate = brate;