diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5697e4689..868787491 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,7 @@ All notable changes to this project will be documented in this file.
 - #1303 garbled text when exporting frame with text
 - #1314 user interface: button order
 - Internal viewer shows red image when bitmap fill is not available (see issue #1320)
+- #1323 Audio playback fails
 
 ## [9.0.0] - 2016-08-12
 ### Added
diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/exporters/SoundExporter.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/exporters/SoundExporter.java
index 0910364fb..7aa8cefcf 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/exporters/SoundExporter.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/exporters/SoundExporter.java
@@ -160,11 +160,13 @@ public class SoundExporter {
         } else {
             List<ByteArrayRange> soundData = st.getRawSoundData();
             SWF swf = ((Tag) st).getSwf();
-            List<SWFInputStream> siss = new ArrayList<>();
+            ByteArrayOutputStream baos = new ByteArrayOutputStream();
             for (ByteArrayRange data : soundData) {
-                siss.add(new SWFInputStream(swf, data.getRangeData()));
+                baos.write(data.getArray(), data.getPos(), data.getLength());
             }
-            fmt.createWav(siss, fos);
+
+            SWFInputStream sis = new SWFInputStream(swf, baos.toByteArray());
+            fmt.createWav(sis, fos);
         }
     }
 }
diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/SoundStreamHeadTag.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/SoundStreamHeadTag.java
index ca689c815..7d770b8de 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/SoundStreamHeadTag.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/SoundStreamHeadTag.java
@@ -228,12 +228,14 @@ public class SoundStreamHeadTag extends Tag implements SoundStreamHeadTypeTag {
     public List<ByteArrayRange> getRawSoundData() {
         List<ByteArrayRange> ret = new ArrayList<>();
         List<SoundStreamBlockTag> blocks = getBlocks();
-        for (SoundStreamBlockTag block : blocks) {
-            ByteArrayRange data = block.streamSoundData;
-            if (streamSoundCompression == SoundFormat.FORMAT_MP3) {
-                ret.add(data.getSubRange(4, data.getLength() - 4));
-            } else {
-                ret.add(data);
+        if (blocks != null) {
+            for (SoundStreamBlockTag block : blocks) {
+                ByteArrayRange data = block.streamSoundData;
+                if (streamSoundCompression == SoundFormat.FORMAT_MP3) {
+                    ret.add(data.getSubRange(4, data.getLength() - 4));
+                } else {
+                    ret.add(data);
+                }
             }
         }
         return ret;
diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/types/sound/SoundFormat.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/types/sound/SoundFormat.java
index 053e0623e..d5e6e19d5 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/types/sound/SoundFormat.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/types/sound/SoundFormat.java
@@ -21,7 +21,6 @@ import com.jpexs.helpers.utf8.Utf8Helper;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
-import java.util.List;
 import javax.sound.sampled.AudioFormat;
 import javax.sound.sampled.AudioSystem;
 import javax.sound.sampled.DataLine;
@@ -198,12 +197,10 @@ public class SoundFormat {
         }
     }
 
-    public boolean createWav(List<SWFInputStream> siss, OutputStream os) {
+    public boolean createWav(SWFInputStream sis, OutputStream os) {
         ensureFormat();
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
-        for (SWFInputStream sis : siss) {
-            decode(sis, baos);
-        }
+        decode(sis, baos);
         try {
             createWavFromPcmData(os, samplingRate, true, stereo, baos.toByteArray());
             return true;
diff --git a/libsrc/ffdec_lib/src/com/jpexs/helpers/Helper.java b/libsrc/ffdec_lib/src/com/jpexs/helpers/Helper.java
index 86731957e..e81e7394e 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/helpers/Helper.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/helpers/Helper.java
@@ -746,6 +746,16 @@ public class Helper {
         }
     }
 
+    public static void appendFile(String file, byte[]... data) {
+        try (FileOutputStream fos = new FileOutputStream(file, true)) {
+            for (byte[] d : data) {
+                fos.write(d);
+            }
+        } catch (IOException ex) {
+            // ignore
+        }
+    }
+
     public static void writeFile(String file, byte[]... data) {
         try (FileOutputStream fos = new FileOutputStream(file)) {
             for (byte[] d : data) {
diff --git a/src/com/jpexs/decompiler/flash/gui/SoundTagPlayer.java b/src/com/jpexs/decompiler/flash/gui/SoundTagPlayer.java
index d11bc769b..e03068a0b 100644
--- a/src/com/jpexs/decompiler/flash/gui/SoundTagPlayer.java
+++ b/src/com/jpexs/decompiler/flash/gui/SoundTagPlayer.java
@@ -94,7 +94,6 @@ public class SoundTagPlayer implements MediaDisplay {
         this.loopCount = loops;
         clip = (Clip) AudioSystem.getLine(new Line.Info(Clip.class));
         clip.addLineListener(new LineListener() {
-
             @Override
             public void update(LineEvent event) {
                 if (event.getType() == LineEvent.Type.STOP) {
@@ -123,7 +122,6 @@ public class SoundTagPlayer implements MediaDisplay {
 
         timer = new Timer();
         timer.schedule(new TimerTask() {
-
             @Override
             public void run() {
 
@@ -141,7 +139,6 @@ public class SoundTagPlayer implements MediaDisplay {
             openSound(tag);
         } else {
             new Thread() {
-
                 @Override
                 public void run() {
                     try {
@@ -155,7 +152,6 @@ public class SoundTagPlayer implements MediaDisplay {
                         }
                     }
                 }
-
             }.start();
         }
     }
@@ -166,14 +162,13 @@ public class SoundTagPlayer implements MediaDisplay {
         if (wavData == null) {
             ByteArrayOutputStream baos = new ByteArrayOutputStream();
             List<ByteArrayRange> soundData = tag.getRawSoundData();
-            List<SWFInputStream> siss = new ArrayList<>();
             for (ByteArrayRange data : soundData) {
-                SWFInputStream sis = new SWFInputStream(swf, data.getArray(), 0, data.getPos() + data.getLength());
-                sis.seek(data.getPos());
-                siss.add(sis);
+                baos.write(data.getArray(), data.getPos(), data.getLength());
             }
 
-            tag.getSoundFormat().createWav(siss, baos);
+            SWFInputStream sis = new SWFInputStream(swf, baos.toByteArray());
+            baos = new ByteArrayOutputStream();
+            tag.getSoundFormat().createWav(sis, baos);
             wavData = baos.toByteArray();
             swf.putToCache(tag, wavData);
         }