diff --git a/src/avdecoder.cpp b/src/avdecoder.cpp
index 42156d1..2f70bff 100644
--- a/src/avdecoder.cpp
+++ b/src/avdecoder.cpp
@@ -17,6 +17,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "utils.h"
 #include "avdecoder.h"
 #include "cmaobject.h"
 
@@ -28,70 +29,49 @@
 AVDecoder::AvInit init;
 
 AVDecoder::AVDecoder() :
-    pFormatCtx(NULL), pCodecCtx(NULL), file(NULL)
+    pFormatCtx(NULL), pCodecCtx(NULL), av_stream(NULL), av_codec(NULL), stream_index(-1)
 {
 }
 
 AVDecoder::~AVDecoder()
 {
+    if(pCodecCtx) {
+        avcodec_close(pCodecCtx);
+    }
     if(pFormatCtx) {
-        av_free(pFormatCtx->pb->buffer);
-        av_free(pFormatCtx->pb);
         avformat_close_input(&pFormatCtx);
     }
-    if(file) {
-        file->close();
-        delete file;
-    }
-}
-
-int AVDecoder::readFunction(void* opaque, uint8_t* buf, int buf_size)
-{
-    QIODevice* stream = (QIODevice*)opaque;
-    int numBytes = stream->read((char*)buf, buf_size);
-    return numBytes;
-}
-
-int64_t AVDecoder::seekFunction(void* opaque, int64_t offset, int whence)
-{
-    if (whence == AVSEEK_SIZE) {
-        return -1;    // I don't know "size of my handle in bytes"
-    }
-    QIODevice* stream = (QIODevice*)opaque;
-    if (stream->isSequential()) {
-        return -1;    // cannot seek a sequential stream
-    }
-    if (! stream->seek(offset) ) {
-        return -1;
-    }
-    return stream->pos();
 }
 
 bool AVDecoder::open(const QString filename)
 {
-    file = new QFile(filename);
-    if(!file->open(QIODevice::ReadOnly)) {
-        return false;
-    }
-    const int ioBufferSize = 32768;
-    unsigned char *ioBuffer = (unsigned char *)av_malloc(ioBufferSize + FF_INPUT_BUFFER_PADDING_SIZE);
-    AVIOContext *avioContext = avio_alloc_context(ioBuffer, ioBufferSize, 0, (void*)(file), &AVDecoder::readFunction, NULL, &AVDecoder::seekFunction);
-    pFormatCtx = avformat_alloc_context();
-    pFormatCtx->pb = avioContext;
-
-
-    if(avformat_open_input(&pFormatCtx, "dummy", NULL, NULL) != 0) {
-        av_free(avioContext->buffer);
-        av_free(avioContext);
+    if(avformat_open_input(&pFormatCtx, QFile::encodeName(filename).constData(), NULL, NULL) != 0) {
         return false;
     }
 
     if(avformat_find_stream_info(pFormatCtx, NULL) < 0) {
-        av_free(avioContext->buffer);
-        av_free(avioContext);
         avformat_close_input(&pFormatCtx);
         return false;
     }
+
+    return true;
+}
+
+bool AVDecoder::loadCodec(codec_type codec)
+{
+    AVDictionary *opts = NULL;
+
+    if((stream_index = av_find_best_stream(pFormatCtx, (AVMediaType)codec, -1, -1, &av_codec, 0)) < 0) {
+        return false;
+    }
+
+    av_stream = pFormatCtx->streams[stream_index];
+    pCodecCtx = av_stream->codec;
+
+    if(avcodec_open2(pCodecCtx, av_codec, &opts) < 0) {
+        return false;
+    }
+
     return true;
 }
 
@@ -107,66 +87,32 @@ const char *AVDecoder::getMetadataEntry(const char *key, const char *default_val
 
 void AVDecoder::getAudioMetadata(metadata_t &metadata)
 {
-    AVDictionaryEntry *entry;
-    AVDictionary* file_metadata = pFormatCtx->metadata;
+    metadata.data.music.artist = strdup(getMetadataEntry("artist", ""));
+    metadata.data.music.album = strdup(getMetadataEntry("album", ""));
+    metadata.data.music.title = strdup(getMetadataEntry("title", ""));
 
-    if((entry = av_dict_get(file_metadata, "artist", NULL, 0)) != NULL) {
-        metadata.data.music.artist = strdup(entry->value);
+    if(loadCodec(CODEC_AUDIO)) {
+        metadata.data.music.tracks->data.track_audio.bitrate = pCodecCtx->bit_rate;
     } else {
-        metadata.data.music.artist = strdup("");
+        metadata.data.music.tracks->data.track_audio.bitrate = pFormatCtx->bit_rate;
     }
-
-    if((entry = av_dict_get(file_metadata, "album", NULL, 0)) != NULL) {
-        metadata.data.music.album = strdup(entry->value);
-    } else {
-        metadata.data.music.album = strdup("");
-    }
-
-    if((entry = av_dict_get(file_metadata, "title", NULL, 0)) != NULL) {
-        metadata.data.music.title = strdup(entry->value);
-    } else {
-        metadata.data.music.title = strdup("");
-    }
-
-    metadata.data.music.tracks->data.track_audio.bitrate = pFormatCtx->bit_rate;
 }
 
 void AVDecoder::getVideoMetadata(metadata_t &metadata)
 {
-    AVDictionaryEntry *entry;
-    AVDictionary* file_metadata = pFormatCtx->metadata;
+    metadata.data.video.copyright = strdup(getMetadataEntry("copyright", ""));
+    metadata.data.video.explanation = strdup(getMetadataEntry("comments", ""));
+    metadata.data.video.title = strdup(getMetadataEntry("title", metadata.name));
 
-    if((entry = av_dict_get(file_metadata, "copyright", NULL, 0)) != NULL) {
-        metadata.data.video.copyright = strdup(entry->value);
-    } else {
-        metadata.data.video.copyright = strdup("");
-    }
-
-    if((entry = av_dict_get(file_metadata, "comments", NULL, 0)) != NULL) {
-        metadata.data.video.explanation = strdup(entry->value);
-    } else {
-        metadata.data.video.explanation = strdup("");
-    }
-
-    if((entry = av_dict_get(file_metadata, "title", NULL, 0)) != NULL) {
-        metadata.data.video.title = strdup(entry->value);
-    } else {
-        metadata.data.video.title = strdup(metadata.name);
-    }
-
-    metadata.data.video.tracks->data.track_video.duration = pFormatCtx->duration / 1000;
-    metadata.data.video.tracks->data.track_video.bitrate = pFormatCtx->bit_rate;
-
-    int stream_index;
-    AVCodec *codec = NULL;
-
-    if((stream_index = av_find_best_stream(pFormatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, &codec, 0)) >= 0) {
-        AVCodecContext *pCodecCtx = pFormatCtx->streams[stream_index]->codec;
+    if(loadCodec(CODEC_VIDEO)) {
         metadata.data.video.tracks->data.track_video.width = pCodecCtx->width;
         metadata.data.video.tracks->data.track_video.height = pCodecCtx->height;
-        if(strcmp(codec->name, "h264") == 0) {
+        metadata.data.video.tracks->data.track_video.bitrate = pCodecCtx->bit_rate;
+        metadata.data.video.tracks->data.track_video.duration = pFormatCtx->duration / 1000;
+
+        if(strcmp(av_codec->name, "h264") == 0) {
             metadata.data.video.tracks->data.track_video.codecType = CODEC_TYPE_AVC;
-        } else if(strcmp(codec->name, "mpeg4") == 0) {
+        } else if(strcmp(av_codec->name, "mpeg4") == 0) {
             metadata.data.video.tracks->data.track_video.codecType = CODEC_TYPE_MPEG4;
         } else {
             metadata.data.video.tracks->data.track_video.codecType = 0;
@@ -174,50 +120,11 @@ void AVDecoder::getVideoMetadata(metadata_t &metadata)
     }
 }
 
-int AVDecoder::getWidth()
-{
-    return pCodecCtx->width;
-}
-
-int AVDecoder::getHeight()
-{
-    return pCodecCtx->height;
-}
-
-int AVDecoder::getDuration()
-{
-    return pFormatCtx->duration / 1000;
-}
-
-int AVDecoder::getBitrate()
-{
-    return pFormatCtx->bit_rate;
-}
-
-int AVDecoder::getCodecBitrate()
-{
-    return pCodecCtx->bit_rate;
-}
-
-bool AVDecoder::loadCodec(codec_type codec)
-{
-    int stream_index = av_find_best_stream(pFormatCtx, (AVMediaType)codec, -1, -1, NULL, 0);
-    if(stream_index >= 0) {
-        pCodecCtx = pFormatCtx->streams[stream_index]->codec;
-        return true;
-    } else {
-        return false;
-    }
-}
-
 QByteArray AVDecoder::getAudioThumbnail(int width, int height)
 {
     QByteArray data;
 
-    int stream_index;
-    AVCodec *codec = NULL;
-    if((stream_index = av_find_best_stream(pFormatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, &codec, 0)) < 0) {
-        // no thumbnail
+    if(!loadCodec(CODEC_VIDEO)) {
         return data;
     }
 
@@ -259,27 +166,16 @@ AVFrame *AVDecoder::getDecodedFrame(AVCodecContext *pCodecCtx, int stream_index)
 QByteArray AVDecoder::getVideoThumbnail(int width, int height)
 {
     QByteArray data;
-    int stream_index;
     AVFrame *pFrame;
-    AVDictionary *opts = NULL;
-    AVCodec *codec = NULL;
-    AVCodecContext *pCodecCtx = NULL;
 
     int percentage = QSettings().value("videoThumbnailSeekPercentage", 30).toInt();
 
-    if((stream_index = av_find_best_stream(pFormatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, &codec, 0)) < 0) {
-        return data;
-    }
-
-    pCodecCtx = pFormatCtx->streams[stream_index]->codec;
-
-    if(avcodec_open2(pCodecCtx, codec, &opts) < 0) {
-        avcodec_close(pCodecCtx);
+    if(!loadCodec(CODEC_VIDEO)) {
         return data;
     }
 
     qint64 seek_pos = pFormatCtx->duration * percentage / (AV_TIME_BASE * 100);
-    qint64 frame = av_rescale(seek_pos,pFormatCtx->streams[stream_index]->time_base.den, pFormatCtx->streams[stream_index]->time_base.num);
+    qint64 frame = av_rescale(seek_pos, av_stream->time_base.den, av_stream->time_base.num);
 
     if(avformat_seek_file(pFormatCtx, stream_index, 0, frame, frame, AVSEEK_FLAG_FRAME) < 0) {
         avcodec_close(pCodecCtx);
@@ -348,10 +244,6 @@ QByteArray AVDecoder::getVideoThumbnail(int width, int height)
 
 void AVDecoder::close()
 {
-    av_free(pFormatCtx->pb->buffer);
-    av_free(pFormatCtx->pb);
     avformat_close_input(&pFormatCtx);
     pFormatCtx = NULL;
-    file->close();
-    file = NULL;
 }
diff --git a/src/avdecoder.h b/src/avdecoder.h
index 1e6d866..2797c2b 100644
--- a/src/avdecoder.h
+++ b/src/avdecoder.h
@@ -20,7 +20,6 @@
 #ifndef AVDECODER_H
 #define AVDECODER_H
 
-#include <QFile>
 #include <QImage>
 #include <QString>
 
@@ -51,11 +50,21 @@ public:
     void getVideoMetadata(metadata_t &metadata);
     const char *getMetadataEntry(const char *key, const char *default_value = NULL);
 
-    int getWidth();
-    int getHeight();
-    int getDuration();
-    int getBitrate();
-    int getCodecBitrate();
+    inline int getWidth() {
+        return pCodecCtx->width;
+    }
+
+    inline int getHeight() {
+        return pCodecCtx->height;
+    }
+
+    inline int getDuration() {
+        return pFormatCtx->duration / 1000;
+    }
+
+    inline int getBitrate() {
+        return pCodecCtx->bit_rate;
+    }
 
     // simulate a static constructor to initialize libav only once
     class AvInit
@@ -63,21 +72,21 @@ public:
     public:
         AvInit() {
             av_register_all();
+            // hide warning logs
+            av_log_set_level(AV_LOG_ERROR);
         }
     };
 
     static AvInit init;
 
 private:
-    void AVFrameToQImage(AVFrame &frame, QImage &image, int width, int height);
     AVFrame *getDecodedFrame(AVCodecContext *pCodecCtx, int stream_index);
 
-    static int readFunction(void* opaque, uint8_t* buf, int buf_size);
-    static int64_t seekFunction(void* opaque, int64_t offset, int whence);
-
     AVFormatContext *pFormatCtx;
     AVCodecContext *pCodecCtx;
-    QFile *file;
+    AVStream *av_stream;
+    AVCodec *av_codec;
+    int stream_index;
 };
 
 #endif // AVDECODER_H