diff --git a/src/AvTranscoder/EssenceStream/DummyVideo.cpp b/src/AvTranscoder/EssenceStream/DummyVideo.cpp
index 2191e4bc..d916dd4f 100644
--- a/src/AvTranscoder/EssenceStream/DummyVideo.cpp
+++ b/src/AvTranscoder/EssenceStream/DummyVideo.cpp
@@ -6,6 +6,8 @@ namespace avtranscoder
 DummyVideo::DummyVideo( )
 	: InputEssence( )
 	, _inputFrame( NULL )
+	, _videoDesc()
+	, _videoFrameDesc()
 	, _numberOfView( 1 )
 {
 }
@@ -32,12 +34,13 @@ void DummyVideo::setFrame( Frame& inputFrame )
 
 bool DummyVideo::readNextFrame( Frame& frameBuffer )
 {
-	frameBuffer.getBuffer().resize( _videoFrameDesc.getDataSize() );
-
 	if( ! _inputFrame )
 	{
 		int fillChar = 0; // fill images with black
-		memset( frameBuffer.getPtr(), fillChar, frameBuffer.getSize() );
+		
+		if( frameBuffer.getSize() != _videoFrameDesc.getDataSize() )
+			frameBuffer.getBuffer().resize( _videoFrameDesc.getDataSize() );
+		memset( frameBuffer.getPtr(), fillChar, _videoFrameDesc.getDataSize() );
 		return true;
 	}
 	
diff --git a/src/AvTranscoder/EssenceStream/OutputVideo.cpp b/src/AvTranscoder/EssenceStream/OutputVideo.cpp
index 79ce8d97..7749bc1c 100644
--- a/src/AvTranscoder/EssenceStream/OutputVideo.cpp
+++ b/src/AvTranscoder/EssenceStream/OutputVideo.cpp
@@ -68,7 +68,7 @@ bool OutputVideo::encodeFrame( const Frame& sourceFrame, DataStream& codedFrame
 	frame->width  = codecContext->width;
 	frame->height = codecContext->height;
 	frame->format = codecContext->pix_fmt;
-	avpicture_fill( (AVPicture*)frame, const_cast< unsigned char * >( sourceImageFrame.getPtr() ), codecContext->pix_fmt, codecContext->width, codecContext->height );
+	avpicture_fill( (AVPicture*)frame, sourceImageFrame.getPtr(), codecContext->pix_fmt, codecContext->width, codecContext->height );
 
 	AVPacket packet;
 	av_init_packet( &packet );
@@ -80,12 +80,7 @@ bool OutputVideo::encodeFrame( const Frame& sourceFrame, DataStream& codedFrame
 	if( ( codecContext->coded_frame ) &&
 		( codecContext->coded_frame->pts != (int)AV_NOPTS_VALUE ) )
 	{
-		// why need to do that ?
-		//packet.pts = av_rescale_q( codecContext->coded_frame->pts, codecContext->time_base, codecContext->time_base );
-
-		//std::cout << "pts with rescale " << (int)packet.pts << std::endl;
 		packet.pts = codecContext->coded_frame->pts;
-		//std::cout << "pts without rescale " << (int)packet.pts << std::endl;
 	}
 
 	if( codecContext->coded_frame &&
@@ -94,7 +89,6 @@ bool OutputVideo::encodeFrame( const Frame& sourceFrame, DataStream& codedFrame
 		packet.flags |= AV_PKT_FLAG_KEY;
 	}
 
-
 #if LIBAVCODEC_VERSION_MAJOR > 53
 	int gotPacket = 0;
 	int ret = avcodec_encode_video2( codecContext, &packet, frame, &gotPacket );
@@ -145,7 +139,6 @@ bool OutputVideo::encodeFrame( const Frame& sourceFrame, DataStream& codedFrame
 	return ret == 0;
 }
 
-
 bool OutputVideo::encodeFrame( DataStream& codedFrame )
 {
 	AVCodecContext* codecContext = _videoDesc.getCodecContext();
diff --git a/src/AvTranscoder/EssenceStructures/VideoFrame.hpp b/src/AvTranscoder/EssenceStructures/VideoFrame.hpp
index cfd582ed..bfade4ad 100644
--- a/src/AvTranscoder/EssenceStructures/VideoFrame.hpp
+++ b/src/AvTranscoder/EssenceStructures/VideoFrame.hpp
@@ -97,9 +97,6 @@ class AvExport VideoFrame : public Frame
 		m_dataBuffer = DataBuffer( ref.getDataSize(), 0 );
 	}
 
-	virtual ~VideoFrame()
-	{};
-
 	const VideoFrameDesc&     desc() const    { return m_videoFrameDesc; }
 
 private:
diff --git a/src/AvTranscoder/EssenceTransform/VideoEssenceTransform.cpp b/src/AvTranscoder/EssenceTransform/VideoEssenceTransform.cpp
index 6e23bf3f..65ccb9f1 100644
--- a/src/AvTranscoder/EssenceTransform/VideoEssenceTransform.cpp
+++ b/src/AvTranscoder/EssenceTransform/VideoEssenceTransform.cpp
@@ -99,11 +99,11 @@ void VideoEssenceTransform::convert( const Frame& srcFrame, Frame& dstFrame )
 
 	for( size_t plane = 0; plane < MAX_SWS_PLANE; ++plane )
 	{
-		_srcData.at( plane ) = (uint8_t*) const_cast< unsigned char* >( src.getPtr() + _srcOffsets.at( plane ) );
+		_srcData.at( plane ) = (uint8_t*) src.getPtr() + _srcOffsets.at( plane );
 		_dstData.at( plane ) = (uint8_t*) dst.getPtr() + _dstOffsets.at( plane );
 	}
 	
-	if( !_imageConvertContext )
+	if( ! _imageConvertContext )
 	{
 		throw std::runtime_error( "unknown color convert context" );
 	}
@@ -112,7 +112,7 @@ void VideoEssenceTransform::convert( const Frame& srcFrame, Frame& dstFrame )
 		&_srcData[0], &_srcLineSize[0], 0, src.desc().getHeight(),
 		&_dstData[0], &_dstLineSize[0] );
 
-	if( ret != (int) src.desc().getHeight() )
+	if( ret != (int) dst.desc().getHeight() )
 		throw std::runtime_error( "error in color converter" );
 }