diff --git a/src/AvTranscoder/DatasStructures/AudioDesc.cpp b/src/AvTranscoder/DatasStructures/AudioDesc.cpp
index bd85fd6a..03869813 100644
--- a/src/AvTranscoder/DatasStructures/AudioDesc.cpp
+++ b/src/AvTranscoder/DatasStructures/AudioDesc.cpp
@@ -37,13 +37,6 @@ AudioDesc::AudioDesc( const AVCodecID codecId )
 	setAudioCodec( codecId );
 }
 
-AudioDesc::AudioDesc( const AudioDesc& audioDesc )
-	: m_codec( NULL )
-	, m_codecContext( NULL ) 
-{
-	setAudioCodec( audioDesc.getAudioCodecId() );
-}
-
 void AudioDesc::setAudioCodec( const std::string& codecName )
 {
 	avcodec_register_all();  // Warning: should be called only once
diff --git a/src/AvTranscoder/DatasStructures/AudioDesc.hpp b/src/AvTranscoder/DatasStructures/AudioDesc.hpp
index f67da23c..d8f28abc 100644
--- a/src/AvTranscoder/DatasStructures/AudioDesc.hpp
+++ b/src/AvTranscoder/DatasStructures/AudioDesc.hpp
@@ -26,8 +26,6 @@ class AvExport AudioDesc
 	AudioDesc( const std::string& codecName = "" );
 	AudioDesc( const AVCodecID codecId );
 	
-	AudioDesc( const AudioDesc& audioDesc );
-
 	void setAudioCodec( const std::string& codecName );
 	void setAudioCodec( const AVCodecID codecId );
 
diff --git a/src/AvTranscoder/Transcoder/StreamTranscoder.cpp b/src/AvTranscoder/Transcoder/StreamTranscoder.cpp
index 53fbf7bf..e9aba161 100644
--- a/src/AvTranscoder/Transcoder/StreamTranscoder.cpp
+++ b/src/AvTranscoder/Transcoder/StreamTranscoder.cpp
@@ -26,6 +26,7 @@ StreamTranscoder::StreamTranscoder(
 	, _outputEssence( NULL )
 	, _transform( NULL )
 	, _transcodeStream( false )
+	, _dummyStream( false )
 {
 	// create a re-wrapping case
 	switch( _inputStream->getStreamType() )
@@ -58,6 +59,7 @@ StreamTranscoder::StreamTranscoder(
 	, _outputEssence( NULL )
 	, _transform( NULL )
 	, _transcodeStream( true )
+	, _dummyStream( false )
 {
 	// create a transcode case
 	switch( _inputStream->getStreamType() )
@@ -121,7 +123,9 @@ StreamTranscoder::StreamTranscoder(
 	, _outputEssence( NULL )
 	, _transform( NULL )
 	, _transcodeStream( true )
+	, _dummyStream( true )
 {
+	// create a dummy case
 	if( ! profile.count( Profile::avProfileType ) )
 		throw std::runtime_error( "unable to found stream type (audio, video, etc.)" );
 
@@ -168,7 +172,9 @@ StreamTranscoder::~StreamTranscoder()
 {
 	if( _frameBuffer )
 		delete _frameBuffer;
-	if( _inputEssence )
+	if( _sourceBuffer )
+		delete _sourceBuffer;
+	if( _inputEssence && ! _dummyStream )
 		delete _inputEssence;
 	if( _outputEssence )
 		delete _outputEssence;
diff --git a/src/AvTranscoder/Transcoder/StreamTranscoder.hpp b/src/AvTranscoder/Transcoder/StreamTranscoder.hpp
index 10257307..b1b46b49 100644
--- a/src/AvTranscoder/Transcoder/StreamTranscoder.hpp
+++ b/src/AvTranscoder/Transcoder/StreamTranscoder.hpp
@@ -63,8 +63,7 @@ class StreamTranscoder
 	EssenceTransform* _transform;
 
 	bool _transcodeStream;
-
-
+	bool _dummyStream;
 };
 	
 }