diff --git a/libavformat/Makefile b/libavformat/Makefile
index 2f3ef01081..0bff900e11 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -73,8 +73,8 @@ OBJS-$(CONFIG_MPEGTS_MUXER)              += mpegtsenc.o
 OBJS-$(CONFIG_MPJPEG_MUXER)              += mpjpeg.o
 OBJS-$(CONFIG_MXF_DEMUXER)               += mxf.o
 OBJS-$(CONFIG_NSV_DEMUXER)               += nsvdec.o riff.o
-OBJS-$(CONFIG_NUT_DEMUXER)               += nut.o riff.o
-OBJS-$(CONFIG_NUT_MUXER)                 += nut.o riff.o
+OBJS-$(CONFIG_NUT_DEMUXER)               += nutdec.o riff.o
+#OBJS-$(CONFIG_NUT_MUXER)                 += nutenc.o riff.o
 OBJS-$(CONFIG_NUV_DEMUXER)               += nuv.o riff.o
 OBJS-$(CONFIG_OGG_DEMUXER)               += ogg2.o           \
                                             oggparsevorbis.o \
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 5536ea9e6b..aad7435ae8 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -249,7 +249,7 @@ void av_register_all(void)
     av_register_input_format(&nut_demuxer);
 #endif
 #ifdef CONFIG_NUT_MUXER
-    av_register_output_format(&nut_muxer);
+//    av_register_output_format(&nut_muxer);
 #endif
 #ifdef CONFIG_NUV_DEMUXER
     av_register_input_format(&nuv_demuxer);
diff --git a/libavformat/nut.h b/libavformat/nut.h
new file mode 100644
index 0000000000..af42a57720
--- /dev/null
+++ b/libavformat/nut.h
@@ -0,0 +1,94 @@
+/*
+ * "NUT" Container Format (de)muxer
+ * Copyright (c) 2006 Michael Niedermayer
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+//#include <limits.h>
+#include "avformat.h"
+#include "crc.h"
+//#include "mpegaudio.h"
+#include "riff.h"
+//#include "adler32.h"
+
+#define      MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
+#define    STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
+#define SYNCPOINT_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
+#define     INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
+#define      INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
+
+#define ID_STRING "nut/multimedia container\0"
+
+#define MAX_DISTANCE (1024*32-1)
+
+typedef enum{
+    FLAG_KEY        =   1, ///<if set, frame is keyframe
+    FLAG_EOR        =   2, ///<if set, stream has no relevance on presentation. (EOR)
+    FLAG_CODED_PTS  =   8, ///<if set, coded_pts is in the frame header
+    FLAG_STREAM_ID  =  16, ///<if set, stream_id is coded in the frame header
+    FLAG_SIZE_MSB   =  32, ///<if set, data_size_msb is at frame header, otherwise data_size_msb is 0
+    FLAG_CHECKSUM   =  64, ///<if set then the frame header contains a checksum
+    FLAG_RESERVED   = 128, ///<if set, reserved_count is coded in the frame header
+    FLAG_CODED      =4096, ///<if set, coded_flags are stored in the frame header.
+    FLAG_INVALID    =8192, ///<if set, frame_code is invalid.
+}flag_t;
+
+typedef struct {
+    uint32_t pos; //64gb limit if div16 (change this to 64 if thats too little)
+    uint64_t global_key_pts;
+    uint32_t back_ptr_div16; //is stored /16
+} syncpoint_t;
+
+typedef struct {
+    uint16_t flags;
+    uint8_t  stream_id;
+    uint16_t size_mul;
+    uint16_t size_lsb;
+    int16_t  pts_delta;
+    uint8_t  reserved_count;
+} FrameCode; // maybe s/FrameCode/framecode_t/ or change all to java style but dont mix
+
+typedef struct {
+    int last_key_frame;  ///<was the last frame a keyfraeme
+    int64_t last_pts;
+    int time_base_id;
+    AVRational time_base;
+    int msb_pts_shift;
+    int max_pts_distance;
+    int decode_delay; //FIXME duplicate of has_b_frames
+} StreamContext;// maybe s/StreamContext/streamcontext_t/
+
+typedef struct {
+    AVFormatContext *avf;
+//    int written_packet_size;
+//    int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
+    FrameCode frame_code[256];
+    uint64_t next_startcode;     ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
+    StreamContext *stream;
+    unsigned int max_distance;
+    unsigned int time_base_count;
+    int64_t last_syncpoint_pos;
+    AVRational *time_base;
+} NUTContext;
+
+
+//FIXME move to a common spot, like crc.c/h
+static unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
+    return av_crc(av_crc04C11DB7, checksum, buf, len);
+}
diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c
new file mode 100644
index 0000000000..5a3caabe89
--- /dev/null
+++ b/libavformat/nutdec.c
@@ -0,0 +1,691 @@
+/*
+ * "NUT" Container Format demuxer
+ * Copyright (c) 2004-2006 Michael Niedermayer
+ * Copyright (c) 2003 Alex Beregszaszi
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#include "nut.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+static uint64_t get_v(ByteIOContext *bc/*, maxstuffing*/){
+    uint64_t val = 0;
+
+    for(;;)
+    {
+        int tmp = get_byte(bc);
+
+//         if(tmp=0x80){
+//             if(!maxstuffing-- || val)
+//                 return -1;
+//         }
+
+        if (tmp&0x80)
+            val= (val<<7) + tmp - 0x80;
+        else{
+            return (val<<7) + tmp;
+        }
+    }
+    return -1;
+}
+
+static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
+    unsigned int len= get_v(bc);
+
+    if(len && maxlen)
+        get_buffer(bc, string, FFMIN(len, maxlen));
+    while(len > maxlen){
+        get_byte(bc);
+        len--;
+    }
+
+    if(maxlen)
+        string[FFMIN(len, maxlen-1)]= 0;
+
+    if(maxlen == len)
+        return -1;
+    else
+        return 0;
+}
+
+static int64_t get_s(ByteIOContext *bc){
+    int64_t v = get_v(bc) + 1;
+
+    if (v&1) return -(v>>1);
+    else     return  (v>>1);
+}
+
+static uint64_t get_fourcc(ByteIOContext *bc){
+    unsigned int len= get_v(bc);
+
+    if     (len==2) return get_le16(bc);
+    else if(len==4) return get_le32(bc);
+    else            return -1;
+}
+
+#ifdef TRACE
+static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
+    uint64_t v= get_v(bc);
+
+    printf("get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+    return v;
+}
+
+static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
+    int64_t v= get_s(bc);
+
+    printf("get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+    return v;
+}
+
+static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
+    uint64_t v= get_vb(bc);
+
+    printf("get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
+    return v;
+}
+#define get_v(bc)  get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#define get_s(bc)  get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#define get_vb(bc)  get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
+#endif
+
+static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
+{
+    int64_t start, size;
+//    start= url_ftell(bc) - 8;
+
+    size= get_v(bc);
+
+    init_checksum(bc, calculate_checksum ? av_crc04C11DB7_update : NULL, 1);
+
+//    nut->packet_start[2] = start;
+//    nut->written_packet_size= size;
+
+    return size;
+}
+
+static int check_checksum(ByteIOContext *bc){
+    unsigned long checksum= get_checksum(bc);
+//    return checksum != get_be32(bc);
+
+    av_log(NULL, AV_LOG_ERROR, "%08X %08X\n", checksum, (int)get_be32(bc));
+
+    return 0;
+}
+
+static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
+    uint64_t state=0;
+
+    if(pos >= 0)
+        url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream isnt seekable, but that shouldnt matter, as in this case we simply start where we are currently
+
+    while(!url_feof(bc)){
+        state= (state<<8) | get_byte(bc);
+        if((state>>56) != 'N')
+            continue;
+        switch(state){
+        case MAIN_STARTCODE:
+        case STREAM_STARTCODE:
+        case SYNCPOINT_STARTCODE:
+        case INFO_STARTCODE:
+        case INDEX_STARTCODE:
+            return state;
+        }
+    }
+
+    return 0;
+}
+
+/**
+ * find the given startcode.
+ * @param code the startcode
+ * @param pos the start position of the search, or -1 if the current position
+ * @returns the position of the startcode or -1 if not found
+ */
+static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
+    for(;;){
+        uint64_t startcode= find_any_startcode(bc, pos);
+        if(startcode == code)
+            return url_ftell(bc) - 8;
+        else if(startcode == 0)
+            return -1;
+        pos=-1;
+    }
+}
+
+static int64_t lsb2full(StreamContext *stream, int64_t lsb){
+    int64_t mask = (1<<stream->msb_pts_shift)-1;
+    int64_t delta= stream->last_pts - mask/2;
+    return  ((lsb - delta)&mask) + delta;
+}
+
+static int nut_probe(AVProbeData *p){
+    int i;
+    uint64_t code= 0;
+
+    for (i = 0; i < p->buf_size; i++) {
+        code = (code << 8) | p->buf[i];
+        if (code == MAIN_STARTCODE)
+            return AVPROBE_SCORE_MAX;
+    }
+    return 0;
+}
+
+#define GET_V(dst, check) \
+    tmp= get_v(bc);\
+    if(!(check)){\
+        av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\
+        return -1;\
+    }\
+    dst= tmp;
+
+static int skip_reserved(ByteIOContext *bc, int64_t pos){
+    pos -= url_ftell(bc);
+
+    if(pos<0){
+        url_fseek(bc, pos, SEEK_CUR);
+        return -1;
+    }else{
+        while(pos--)
+            get_byte(bc);
+        return 0;
+    }
+}
+
+static int decode_main_header(NUTContext *nut){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+    uint64_t tmp, end;
+    unsigned int stream_count;
+    int i, j, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res;
+
+    end= get_packetheader(nut, bc, 1);
+    end += url_ftell(bc) - 4;
+
+    GET_V(tmp              , tmp >=2 && tmp <= 3)
+    GET_V(stream_count     , tmp > 0 && tmp <=MAX_STREAMS)
+
+    nut->max_distance = get_v(bc);
+    if(nut->max_distance > 65536){
+        av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
+        nut->max_distance= 65536;
+    }
+
+    GET_V(nut->time_base_count, tmp>0 && tmp<INT_MAX / sizeof(AVRational))
+    nut->time_base= av_malloc(nut->time_base_count * sizeof(AVRational));
+
+    for(i=0; i<nut->time_base_count; i++){
+        GET_V(nut->time_base[i].num, tmp>0 && tmp<(1ULL<<31))
+        GET_V(nut->time_base[i].den, tmp>0 && tmp<(1ULL<<31))
+        if(ff_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1){
+            av_log(s, AV_LOG_ERROR, "time base invalid\n");
+            return -1;
+        }
+    }
+    tmp_pts=0;
+    tmp_mul=1;
+    tmp_stream=0;
+    for(i=0; i<256;){
+        int tmp_flags = get_v(bc);
+        int tmp_fields= get_v(bc);
+        if(tmp_fields>0) tmp_pts   = get_s(bc);
+        if(tmp_fields>1) tmp_mul   = get_v(bc);
+        if(tmp_fields>2) tmp_stream= get_v(bc);
+        if(tmp_fields>3) tmp_size  = get_v(bc);
+        else             tmp_size  = 0;
+        if(tmp_fields>4) tmp_res   = get_v(bc);
+        else             tmp_res   = 0;
+        if(tmp_fields>5) count     = get_v(bc);
+        else             count     = tmp_mul - tmp_size;
+
+        while(tmp_fields-- > 6)
+           get_v(bc);
+
+        if(count == 0 || i+count > 256){
+            av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
+            return -1;
+        }
+        if(tmp_stream >= stream_count){
+            av_log(s, AV_LOG_ERROR, "illegal stream number\n");
+            return -1;
+        }
+
+        for(j=0; j<count; j++,i++){
+            if (i == 'N') {
+                nut->frame_code[i].flags= FLAG_INVALID;
+                j--;
+                continue;
+            }
+            nut->frame_code[i].flags           = tmp_flags ;
+            nut->frame_code[i].pts_delta       = tmp_pts   ;
+            nut->frame_code[i].stream_id       = tmp_stream;
+            nut->frame_code[i].size_mul        = tmp_mul   ;
+            nut->frame_code[i].size_lsb        = tmp_size+j;
+            nut->frame_code[i].reserved_count  = tmp_res   ;
+        }
+    }
+    assert(nut->frame_code['N'].flags == FLAG_INVALID);
+
+    if(skip_reserved(bc, end) || check_checksum(bc)){
+        av_log(s, AV_LOG_ERROR, "Main header checksum mismatch\n");
+        return -1;
+    }
+
+    nut->stream = av_mallocz(sizeof(StreamContext)*stream_count);
+    for(i=0; i<stream_count; i++){
+        av_new_stream(s, i);
+    }
+
+    return 0;
+}
+
+static int decode_stream_header(NUTContext *nut){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+    StreamContext *stc;
+    int class, nom, denom, stream_id;
+    uint64_t tmp, end;
+    AVStream *st;
+
+    end= get_packetheader(nut, bc, 1);
+    end += url_ftell(bc) - 4;
+
+    GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base.num);
+    stc= &nut->stream[stream_id];
+
+    st = s->streams[stream_id];
+    if (!st)
+        return AVERROR_NOMEM;
+
+    class = get_v(bc);
+    tmp = get_fourcc(bc);
+    st->codec->codec_tag= tmp;
+    switch(class)
+    {
+        case 0:
+            st->codec->codec_type = CODEC_TYPE_VIDEO;
+            st->codec->codec_id = codec_get_bmp_id(tmp);
+            if (st->codec->codec_id == CODEC_ID_NONE)
+                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
+            break;
+        case 1:
+            st->codec->codec_type = CODEC_TYPE_AUDIO;
+            st->codec->codec_id = codec_get_wav_id(tmp);
+            if (st->codec->codec_id == CODEC_ID_NONE)
+                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
+            break;
+        case 2:
+//            st->codec->codec_type = CODEC_TYPE_TEXT;
+//            break;
+        case 3:
+            st->codec->codec_type = CODEC_TYPE_DATA;
+            break;
+        default:
+            av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
+            return -1;
+    }
+    GET_V(stc->time_base_id    , tmp < nut->time_base_count);
+    GET_V(stc->msb_pts_shift   , tmp < 16);
+    stc->max_pts_distance= get_v(bc);
+    GET_V(stc->decode_delay    , tmp < 1000); //sanity limit, raise this if moors law is true
+    st->codec->has_b_frames= stc->decode_delay;
+    get_v(bc); //stream flags
+
+    GET_V(st->codec->extradata_size, tmp < (1<<30));
+    if(st->codec->extradata_size){
+        st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
+        get_buffer(bc, st->codec->extradata, st->codec->extradata_size);
+    }
+
+    if (st->codec->codec_type == CODEC_TYPE_VIDEO){
+        GET_V(st->codec->width , tmp > 0)
+        GET_V(st->codec->height, tmp > 0)
+        st->codec->sample_aspect_ratio.num= get_v(bc);
+        st->codec->sample_aspect_ratio.den= get_v(bc);
+        if((!st->codec->sample_aspect_ratio.num) != (!st->codec->sample_aspect_ratio.den)){
+            av_log(s, AV_LOG_ERROR, "invalid aspect ratio\n");
+            return -1;
+        }
+        get_v(bc); /* csp type */
+    }else if (st->codec->codec_type == CODEC_TYPE_AUDIO){
+        GET_V(st->codec->sample_rate , tmp > 0)
+        tmp= get_v(bc); // samplerate_den
+        if(tmp > st->codec->sample_rate){
+            av_log(s, AV_LOG_ERROR, "bleh, libnut muxed this ;)\n");
+            st->codec->sample_rate= tmp;
+        }
+        GET_V(st->codec->channels, tmp > 0)
+    }
+    if(skip_reserved(bc, end) || check_checksum(bc)){
+        av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id);
+        return -1;
+    }
+    stc->time_base= nut->time_base[stc->time_base_id];
+    av_set_pts_info(s->streams[stream_id], 63, stc->time_base.num, stc->time_base.den);
+    return 0;
+}
+
+static int decode_info_header(NUTContext *nut){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+    uint64_t tmp;
+    unsigned int stream_id_plus1, chapter_start, chapter_len, count;
+    int chapter_id, i;
+    int64_t value, end;
+    char name[256], str_value[1024], type_str[256], *type= type_str;
+
+    end= get_packetheader(nut, bc, 1);
+    end += url_ftell(bc) - 4;
+
+    GET_V(stream_id_plus1, tmp <= s->nb_streams)
+    chapter_id   = get_s(bc);
+    chapter_start= get_v(bc);
+    chapter_len  = get_v(bc);
+    count        = get_v(bc);
+    for(i=0; i<count; i++){
+        get_str(bc, name, sizeof(name));
+        value= get_s(bc);
+        if(value == -1){
+            type= "UTF-8";
+            get_str(bc, str_value, sizeof(str_value));
+        }else if(value == -2){
+            get_str(bc, type, sizeof(type));
+            get_str(bc, str_value, sizeof(str_value));
+        }else if(value == -3){
+            type= "s";
+            value= get_s(bc);
+        }else if(value == -4){
+            type= "t";
+            value= get_v(bc);
+        }else if(value < -4){
+            type= "r";
+            get_s(bc);
+        }else{
+            type= "v";
+        }
+
+        if(chapter_id==0 && !strcmp(type, "UTF-8")){
+            if     (!strcmp(name, "Author"))
+                pstrcpy(s->author   , sizeof(s->author)   , str_value);
+            else if(!strcmp(name, "Title"))
+                pstrcpy(s->title    , sizeof(s->title)    , str_value);
+            else if(!strcmp(name, "Copyright"))
+                pstrcpy(s->copyright, sizeof(s->copyright), str_value);
+            else if(!strcmp(name, "Description"))
+                pstrcpy(s->comment  , sizeof(s->comment)  , str_value);
+        }
+    }
+
+    if(skip_reserved(bc, end) || check_checksum(bc)){
+        av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
+        return -1;
+    }
+    return 0;
+}
+
+static int decode_syncpoint(NUTContext *nut){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+    int64_t end;
+    uint64_t tmp;
+    int i;
+    AVRational time_base;
+
+    nut->last_syncpoint_pos= url_ftell(bc);
+
+    end= get_packetheader(nut, bc, 1);
+    end += url_ftell(bc) - 4;
+
+    tmp= get_v(bc);
+    get_v(bc); //back_ptr_div16
+
+    time_base= nut->time_base[tmp % nut->time_base_count];
+    for(i=0; i<s->nb_streams; i++){
+        nut->stream[i].last_pts= av_rescale_q(tmp / nut->time_base_count, time_base, nut->stream[i].time_base); //FIXME rounding and co
+        //last_key_frame ?
+    }
+    //FIXME put this in a reset func maybe
+
+    if(skip_reserved(bc, end) || check_checksum(bc)){
+        av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
+        return -1;
+    }
+    return 0;
+}
+
+static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    NUTContext *nut = s->priv_data;
+    ByteIOContext *bc = &s->pb;
+    int64_t pos;
+    int inited_stream_count;
+
+    nut->avf= s;
+
+    /* main header */
+    pos=0;
+    for(;;){
+        pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
+        if (pos<0+1){
+            av_log(s, AV_LOG_ERROR, "no main startcode found\n");
+            return -1;
+        }
+        if(decode_main_header(nut) >= 0)
+            break;
+    }
+
+    /* stream headers */
+    pos=0;
+    for(inited_stream_count=0; inited_stream_count < s->nb_streams;){
+        pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
+        if (pos<0+1){
+            av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
+            return -1;
+        }
+        if(decode_stream_header(nut) >= 0)
+            inited_stream_count++;
+    }
+
+    /* info headers */
+    pos=0;
+    for(;;){
+        uint64_t startcode= find_any_startcode(bc, pos);
+        pos= url_ftell(bc);
+
+        if(startcode==0){
+            av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
+            return -1;
+        }else if(startcode == SYNCPOINT_STARTCODE){
+            nut->next_startcode= startcode;
+            break;
+        }else if(startcode != INFO_STARTCODE){
+            continue;
+        }
+
+        decode_info_header(nut);
+    }
+
+    return 0;
+}
+
+static int decode_frame_header(NUTContext *nut, int *flags_ret, int64_t *pts, int *stream_id, int frame_code){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+    StreamContext *stc;
+    int size, flags, size_mul, pts_delta, i, reserved_count;
+    uint64_t tmp;
+
+    if(url_ftell(bc) > nut->last_syncpoint_pos + nut->max_distance){
+        av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
+        return -1;
+    }
+
+    flags          = nut->frame_code[frame_code].flags;
+    size_mul       = nut->frame_code[frame_code].size_mul;
+    size           = nut->frame_code[frame_code].size_lsb;
+    *stream_id     = nut->frame_code[frame_code].stream_id;
+    pts_delta      = nut->frame_code[frame_code].pts_delta;
+    reserved_count = nut->frame_code[frame_code].reserved_count;
+
+    if(flags & FLAG_INVALID)
+        return -1;
+    if(flags & FLAG_CODED)
+        flags ^= get_v(bc);
+    if(flags & FLAG_STREAM_ID){
+        GET_V(*stream_id, tmp < s->nb_streams)
+    }
+    stc= &nut->stream[*stream_id];
+    if(flags&FLAG_CODED_PTS){
+        int coded_pts= get_v(bc);
+//FIXME check last_pts validity?
+        if(coded_pts < (1<<stc->msb_pts_shift)){
+            *pts=lsb2full(stc, coded_pts);
+        }else
+            *pts=coded_pts - (1<<stc->msb_pts_shift);
+    }else
+        *pts= stc->last_pts + pts_delta;
+    if(flags&FLAG_SIZE_MSB){
+        size += size_mul*get_v(bc);
+    }
+    if(flags&FLAG_RESERVED)
+        reserved_count= get_v(bc);
+    for(i=0; i<reserved_count; i++)
+        get_v(bc);
+    if(flags&FLAG_CHECKSUM){
+        get_be32(bc); //FIXME check this
+    }
+    *flags_ret= flags;
+
+    stc->last_pts= *pts;
+    stc->last_key_frame= flags&FLAG_KEY; //FIXME change to last flags
+
+    return size;
+}
+
+static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){
+    AVFormatContext *s= nut->avf;
+    ByteIOContext *bc = &s->pb;
+    int size, stream_id, flags, discard;
+    int64_t pts, last_IP_pts;
+
+    size= decode_frame_header(nut, &flags, &pts, &stream_id, frame_code);
+    if(size < 0)
+        return -1;
+
+    discard= s->streams[ stream_id ]->discard;
+    last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
+    if(  (discard >= AVDISCARD_NONKEY && !(flags & FLAG_KEY))
+       ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
+       || discard >= AVDISCARD_ALL){
+        url_fskip(bc, size);
+        return 1;
+    }
+
+    av_get_packet(bc, pkt, size);
+    pkt->stream_index = stream_id;
+    if (flags & FLAG_KEY)
+        pkt->flags |= PKT_FLAG_KEY;
+    pkt->pts = pts;
+
+    return 0;
+}
+
+static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    NUTContext *nut = s->priv_data;
+    ByteIOContext *bc = &s->pb;
+    int i, frame_code=0, ret, skip;
+
+    for(;;){
+        int64_t pos= url_ftell(bc);
+        uint64_t tmp= nut->next_startcode;
+        nut->next_startcode=0;
+
+        if (url_feof(bc))
+            return -1;
+
+        if(tmp){
+            pos-=8;
+        }else{
+            frame_code = get_byte(bc);
+            if(frame_code == 'N'){
+                tmp= frame_code;
+                for(i=1; i<8; i++)
+                    tmp = (tmp<<8) + get_byte(bc);
+            }
+        }
+        switch(tmp){
+        case MAIN_STARTCODE:
+        case STREAM_STARTCODE:
+        case INDEX_STARTCODE:
+            skip= get_packetheader(nut, bc, 0);
+            url_fseek(bc, skip, SEEK_CUR);
+            break;
+        case INFO_STARTCODE:
+            if(decode_info_header(nut)<0)
+                goto resync;
+            break;
+        case SYNCPOINT_STARTCODE:
+            if(decode_syncpoint(nut)<0)
+                goto resync;
+            frame_code = get_byte(bc);
+        case 0:
+            ret= decode_frame(nut, pkt, frame_code);
+            if(ret==0)
+                return 0;
+            else if(ret==1) //ok but discard packet
+                break;
+        default:
+resync:
+av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
+            tmp= find_any_startcode(bc, pos+1);
+            if(tmp==0)
+                return -1;
+av_log(s, AV_LOG_DEBUG, "sync\n");
+            nut->next_startcode= tmp;
+        }
+    }
+}
+
+static int nut_read_close(AVFormatContext *s)
+{
+    NUTContext *nut = s->priv_data;
+
+    av_freep(&nut->time_base);
+    av_freep(&nut->stream);
+
+    return 0;
+}
+
+#ifdef CONFIG_NUT_DEMUXER
+AVInputFormat nut_demuxer = {
+    "nut",
+    "nut format",
+    sizeof(NUTContext),
+    nut_probe,
+    nut_read_header,
+    nut_read_packet,
+    nut_read_close,
+    NULL,
+    NULL,
+    .extensions = "nut",
+};
+#endif