diff --git a/configure b/configure
index 61d8160491..c03ff02297 100755
--- a/configure
+++ b/configure
@@ -272,6 +272,7 @@ External library support:
   --enable-libxcb-shape    enable X11 grabbing shape rendering [autodetect]
   --enable-libxvid         enable Xvid encoding via xvidcore,
                            native MPEG-4/Xvid encoder exists [no]
+  --enable-libxml2         enable XML parsing using the C library libxml2 [no]
   --enable-libzimg         enable z.lib, needed for zscale filter [no]
   --enable-libzmq          enable message passing via libzmq [no]
   --enable-libzvbi         enable teletext support via libzvbi [no]
@@ -1578,6 +1579,7 @@ EXTERNAL_LIBRARY_LIST="
     libvpx
     libwavpack
     libwebp
+    libxml2
     libzimg
     libzmq
     libzvbi
@@ -2939,6 +2941,7 @@ avi_muxer_select="riffenc"
 caf_demuxer_select="iso_media riffdec"
 caf_muxer_select="iso_media"
 dash_muxer_select="mp4_muxer"
+dash_demuxer_deps="libxml2"
 dirac_demuxer_select="dirac_parser"
 dts_demuxer_select="dca_parser"
 dtshd_demuxer_select="dca_parser"
@@ -6005,6 +6008,7 @@ enabled openssl           && { use_pkg_config openssl openssl/ssl.h OPENSSL_init
                                check_lib openssl openssl/ssl.h SSL_library_init -lssl -lcrypto -lws2_32 -lgdi32 ||
                                die "ERROR: openssl not found"; }
 enabled qtkit_indev      && { check_header_objcc QTKit/QTKit.h || disable qtkit_indev; }
+enabled libxml2          && require_pkg_config libxml-2.0 libxml2/libxml/xmlversion.h xmlCheckVersion
 
 if enabled gcrypt; then
     GCRYPT_CONFIG="${cross_prefix}libgcrypt-config"
diff --git a/libavformat/Makefile b/libavformat/Makefile
index f2b465cfa2..3d478749d0 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -133,6 +133,7 @@ OBJS-$(CONFIG_CRC_MUXER)                 += crcenc.o
 OBJS-$(CONFIG_DATA_DEMUXER)              += rawdec.o
 OBJS-$(CONFIG_DATA_MUXER)                += rawenc.o
 OBJS-$(CONFIG_DASH_MUXER)                += dashenc.o
+OBJS-$(CONFIG_DASH_DEMUXER)              += dashdec.o
 OBJS-$(CONFIG_DAUD_DEMUXER)              += dauddec.o
 OBJS-$(CONFIG_DAUD_MUXER)                += daudenc.o
 OBJS-$(CONFIG_DCSTR_DEMUXER)             += dcstr.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index cd8200ea1c..aeb9b710fe 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -96,7 +96,7 @@ static void register_all(void)
     REGISTER_DEMUXER (CINE,             cine);
     REGISTER_DEMUXER (CONCAT,           concat);
     REGISTER_MUXER   (CRC,              crc);
-    REGISTER_MUXER   (DASH,             dash);
+    REGISTER_MUXDEMUX(DASH,             dash);
     REGISTER_MUXDEMUX(DATA,             data);
     REGISTER_MUXDEMUX(DAUD,             daud);
     REGISTER_DEMUXER (DCSTR,            dcstr);
diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
new file mode 100644
index 0000000000..1739138684
--- /dev/null
+++ b/libavformat/dashdec.c
@@ -0,0 +1,2039 @@
+/*
+ * Dynamic Adaptive Streaming over HTTP demux
+ * Copyright (c) 2017 samsamsam@o2.pl based on HLS demux
+ * Copyright (c) 2017 Steven Liu
+ *
+ * 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 <libxml/parser.h>
+#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
+#include "libavutil/time.h"
+#include "libavutil/parseutils.h"
+#include "internal.h"
+#include "avio_internal.h"
+
+#define INITIAL_BUFFER_SIZE 32768
+
+struct fragment {
+    int64_t url_offset;
+    int64_t size;
+    char *url;
+};
+
+/*
+ * reference to : ISO_IEC_23009-1-DASH-2012
+ * Section: 5.3.9.6.2
+ * Table: Table 17 — Semantics of SegmentTimeline element
+ * */
+struct timeline {
+    /* starttime: Element or Attribute Name
+     * specifies the MPD start time, in @timescale units,
+     * the first Segment in the series starts relative to the beginning of the Period.
+     * The value of this attribute must be equal to or greater than the sum of the previous S
+     * element earliest presentation time and the sum of the contiguous Segment durations.
+     * If the value of the attribute is greater than what is expressed by the previous S element,
+     * it expresses discontinuities in the timeline.
+     * If not present then the value shall be assumed to be zero for the first S element
+     * and for the subsequent S elements, the value shall be assumed to be the sum of
+     * the previous S element's earliest presentation time and contiguous duration
+     * (i.e. previous S@starttime + @duration * (@repeat + 1)).
+     * */
+    int64_t starttime;
+    /* repeat: Element or Attribute Name
+     * specifies the repeat count of the number of following contiguous Segments with
+     * the same duration expressed by the value of @duration. This value is zero-based
+     * (e.g. a value of three means four Segments in the contiguous series).
+     * */
+    int64_t repeat;
+    /* duration: Element or Attribute Name
+     * specifies the Segment duration, in units of the value of the @timescale.
+     * */
+    int64_t duration;
+};
+
+typedef enum {
+    DASH_TMPL_ID_UNDEFINED = -1,
+    DASH_TMPL_ID_ESCAPE,
+    DASH_TMPL_ID_REP_ID,
+    DASH_TMPL_ID_NUMBER,
+    DASH_TMPL_ID_BANDWIDTH,
+    DASH_TMPL_ID_TIME,
+} DASHTmplId;
+
+/*
+ * Each playlist has its own demuxer. If it is currently active,
+ * it has an opened AVIOContext too, and potentially an AVPacket
+ * containing the next packet from this stream.
+ */
+struct representation {
+    char *url_template;
+    char *url_template_pattern;
+    char *url_template_format;
+    DASHTmplId tmp_url_type;
+    AVIOContext pb;
+    AVIOContext *input;
+    AVFormatContext *parent;
+    AVFormatContext *ctx;
+    AVPacket pkt;
+    int rep_idx;
+    int rep_count;
+    int stream_index;
+
+    enum AVMediaType type;
+    int64_t target_duration;
+
+    int n_fragments;
+    struct fragment **fragments; /* VOD list of fragment for profile */
+
+    int n_timelines;
+    struct timeline **timelines;
+
+    int64_t first_seq_no;
+    int64_t last_seq_no;
+    int64_t start_number; /* used in case when we have dynamic list of segment to know which segments are new one*/
+
+    int64_t fragment_duration;
+    int64_t fragment_timescale;
+
+    int64_t presentation_timeoffset;
+
+    int64_t cur_seq_no;
+    int64_t cur_seg_offset;
+    int64_t cur_seg_size;
+    struct fragment *cur_seg;
+
+    /* Currently active Media Initialization Section */
+    struct fragment *init_section;
+    uint8_t *init_sec_buf;
+    uint32_t init_sec_buf_size;
+    uint32_t init_sec_data_len;
+    uint32_t init_sec_buf_read_offset;
+    int fix_multiple_stsd_order;
+    int64_t cur_timestamp;
+    int is_restart_needed;
+};
+
+typedef struct DASHContext {
+    const AVClass *class;
+    char *base_url;
+    struct representation *cur_video;
+    struct representation *cur_audio;
+
+    /* MediaPresentationDescription Attribute */
+    uint64_t media_presentation_duration;
+    uint64_t suggested_presentation_delay;
+    uint64_t availability_start_time;
+    uint64_t publish_time;
+    uint64_t minimum_update_period;
+    uint64_t time_shift_buffer_depth;
+    uint64_t min_buffer_time;
+
+    /* Period Attribute */
+    uint64_t period_duration;
+    uint64_t period_start;
+
+    int is_live;
+    AVIOInterruptCB *interrupt_callback;
+    char *user_agent;                    ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
+    char *cookies;                       ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
+    char *headers;                       ///< holds HTTP headers set as an AVOption to the HTTP protocol context
+    char *allowed_extensions;
+    AVDictionary *avio_opts;
+} DASHContext;
+
+static uint64_t get_current_time_in_sec(void)
+{
+    return  av_gettime() / 1000000;
+}
+
+static uint64_t get_utc_date_time_insec(AVFormatContext *s, const char *datetime)
+{
+    struct tm timeinfo;
+    int year = 0;
+    int month = 0;
+    int day = 0;
+    int hour = 0;
+    int minute = 0;
+    int ret = 0;
+    float second = 0.0;
+
+    /* ISO-8601 date parser */
+    if (!datetime)
+        return 0;
+
+    ret = sscanf(datetime, "%d-%d-%dT%d:%d:%fZ", &year, &month, &day, &hour, &minute, &second);
+    /* year, month, day, hour, minute, second  6 arguments */
+    if (ret != 6) {
+        av_log(s, AV_LOG_WARNING, "get_utc_date_time_insec get a wrong time format\n");
+    }
+    timeinfo.tm_year = year - 1900;
+    timeinfo.tm_mon  = month - 1;
+    timeinfo.tm_mday = day;
+    timeinfo.tm_hour = hour;
+    timeinfo.tm_min  = minute;
+    timeinfo.tm_sec  = (int)second;
+
+    return av_timegm(&timeinfo);
+}
+
+static uint32_t get_duration_insec(AVFormatContext *s, const char *duration)
+{
+    /* ISO-8601 duration parser */
+    uint32_t days = 0;
+    uint32_t hours = 0;
+    uint32_t mins = 0;
+    uint32_t secs = 0;
+    int size = 0;
+    float value = 0;
+    char type = '\0';
+    const char *ptr = duration;
+
+    while (*ptr) {
+        if (*ptr == 'P' || *ptr == 'T') {
+            ptr++;
+            continue;
+        }
+
+        if (sscanf(ptr, "%f%c%n", &value, &type, &size) != 2) {
+            av_log(s, AV_LOG_WARNING, "get_duration_insec get a wrong time format\n");
+            return 0; /* parser error */
+        }
+        switch (type) {
+            case 'D':
+                days = (uint32_t)value;
+                break;
+            case 'H':
+                hours = (uint32_t)value;
+                break;
+            case 'M':
+                mins = (uint32_t)value;
+                break;
+            case 'S':
+                secs = (uint32_t)value;
+                break;
+            default:
+                // handle invalid type
+                break;
+        }
+        ptr += size;
+    }
+    return  ((days * 24 + hours) * 60 + mins) * 60 + secs;
+}
+
+static int64_t get_segment_start_time_based_on_timeline(struct representation *pls, int64_t cur_seq_no)
+{
+    int64_t start_time = 0;
+    int64_t i = 0;
+    int64_t j = 0;
+    int64_t num = 0;
+
+    if (pls->n_timelines) {
+        for (i = 0; i < pls->n_timelines; i++) {
+            if (pls->timelines[i]->starttime > 0) {
+                start_time = pls->timelines[i]->starttime;
+            }
+            if (num == cur_seq_no)
+                goto finish;
+
+            start_time += pls->timelines[i]->duration;
+            for (j = 0; j < pls->timelines[i]->repeat; j++) {
+                num++;
+                if (num == cur_seq_no)
+                    goto finish;
+                start_time += pls->timelines[i]->duration;
+            }
+            num++;
+        }
+    }
+finish:
+    return start_time;
+}
+
+static int64_t calc_next_seg_no_from_timelines(struct representation *pls, int64_t cur_time)
+{
+    int64_t i = 0;
+    int64_t j = 0;
+    int64_t num = 0;
+    int64_t start_time = 0;
+
+    for (i = 0; i < pls->n_timelines; i++) {
+        if (pls->timelines[i]->starttime > 0) {
+            start_time = pls->timelines[i]->starttime;
+        }
+        if (start_time > cur_time)
+            goto finish;
+
+        start_time += pls->timelines[i]->duration;
+        for (j = 0; j < pls->timelines[i]->repeat; j++) {
+            num++;
+            if (start_time > cur_time)
+                goto finish;
+            start_time += pls->timelines[i]->duration;
+        }
+        num++;
+    }
+
+    return -1;
+
+finish:
+    return num;
+}
+
+static void free_fragment(struct fragment **seg)
+{
+    if (!(*seg)) {
+        return;
+    }
+    av_freep(&(*seg)->url);
+    av_freep(seg);
+}
+
+static void free_fragment_list(struct representation *pls)
+{
+    int i;
+
+    for (i = 0; i < pls->n_fragments; i++) {
+        free_fragment(&pls->fragments[i]);
+    }
+    av_freep(&pls->fragments);
+    pls->n_fragments = 0;
+}
+
+static void free_timelines_list(struct representation *pls)
+{
+    int i;
+
+    for (i = 0; i < pls->n_timelines; i++) {
+        av_freep(&pls->timelines[i]);
+    }
+    av_freep(&pls->timelines);
+    pls->n_timelines = 0;
+}
+
+static void free_representation(struct representation *pls)
+{
+    free_fragment_list(pls);
+    free_timelines_list(pls);
+    free_fragment(&pls->cur_seg);
+    free_fragment(&pls->init_section);
+    av_freep(&pls->init_sec_buf);
+    av_freep(&pls->pb.buffer);
+    if (pls->input)
+        ff_format_io_close(pls->parent, &pls->input);
+    if (pls->ctx) {
+        pls->ctx->pb = NULL;
+        avformat_close_input(&pls->ctx);
+    }
+
+    av_freep(&pls->url_template_pattern);
+    av_freep(&pls->url_template_format);
+    av_freep(&pls->url_template);
+    av_freep(pls);
+}
+
+static void set_httpheader_options(DASHContext *c, AVDictionary *opts)
+{
+    // broker prior HTTP options that should be consistent across requests
+    av_dict_set(&opts, "user-agent", c->user_agent, 0);
+    av_dict_set(&opts, "cookies", c->cookies, 0);
+    av_dict_set(&opts, "headers", c->headers, 0);
+    if (c->is_live) {
+        av_dict_set(&opts, "seekable", "0", 0);
+    }
+}
+static void update_options(char **dest, const char *name, void *src)
+{
+    av_freep(dest);
+    av_opt_get(src, name, AV_OPT_SEARCH_CHILDREN, (uint8_t**)dest);
+    if (*dest)
+        av_freep(dest);
+}
+
+static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
+                    AVDictionary *opts, AVDictionary *opts2, int *is_http)
+{
+    DASHContext *c = s->priv_data;
+    AVDictionary *tmp = NULL;
+    const char *proto_name = NULL;
+    int ret;
+
+    av_dict_copy(&tmp, opts, 0);
+    av_dict_copy(&tmp, opts2, 0);
+
+    if (av_strstart(url, "crypto", NULL)) {
+        if (url[6] == '+' || url[6] == ':')
+            proto_name = avio_find_protocol_name(url + 7);
+    }
+
+    if (!proto_name)
+        proto_name = avio_find_protocol_name(url);
+
+    if (!proto_name)
+        return AVERROR_INVALIDDATA;
+
+    // only http(s) & file are allowed
+    if (av_strstart(proto_name, "file", NULL)) {
+        if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
+            av_log(s, AV_LOG_ERROR,
+                "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
+                "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
+                url);
+            return AVERROR_INVALIDDATA;
+        }
+    } else if (av_strstart(proto_name, "http", NULL)) {
+        ;
+    } else
+        return AVERROR_INVALIDDATA;
+
+    if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
+        ;
+    else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
+        ;
+    else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
+        return AVERROR_INVALIDDATA;
+
+    ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
+    if (ret >= 0) {
+        // update cookies on http response with setcookies.
+        char *new_cookies = NULL;
+
+        if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
+            av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
+
+        if (new_cookies) {
+            av_free(c->cookies);
+            c->cookies = new_cookies;
+        }
+
+        av_dict_set(&opts, "cookies", c->cookies, 0);
+    }
+
+    av_dict_free(&tmp);
+
+    if (is_http)
+        *is_http = av_strstart(proto_name, "http", NULL);
+
+    return ret;
+}
+
+static char *get_content_url(xmlNodePtr *baseurl_nodes,
+                             int n_baseurl_nodes,
+                             char *rep_id_val,
+                             char *rep_bandwidth_val,
+                             char *val)
+{
+    int i;
+    char *text;
+    char *url = NULL;
+    char tmp_str[MAX_URL_SIZE];
+    char tmp_str_2[MAX_URL_SIZE];
+
+    memset(tmp_str, 0, sizeof(tmp_str));
+
+    for (i = 0; i < n_baseurl_nodes; ++i) {
+        if (baseurl_nodes[i] &&
+            baseurl_nodes[i]->children &&
+            baseurl_nodes[i]->children->type == XML_TEXT_NODE) {
+            text = xmlNodeGetContent(baseurl_nodes[i]->children);
+            if (text) {
+                memset(tmp_str, 0, sizeof(tmp_str));
+                memset(tmp_str_2, 0, sizeof(tmp_str_2));
+                ff_make_absolute_url(tmp_str_2, MAX_URL_SIZE, tmp_str, text);
+                av_strlcpy(tmp_str, tmp_str_2, sizeof(tmp_str));
+                av_free(text);
+            }
+        }
+    }
+
+    if (val)
+        av_strlcat(tmp_str, (const char*)val, sizeof(tmp_str));
+
+    if (rep_id_val) {
+        url = av_strireplace(tmp_str, "$RepresentationID$", (const char*)rep_id_val);
+        if (!url) {
+            return NULL;
+        }
+        av_strlcpy(tmp_str, url, sizeof(tmp_str));
+        av_free(url);
+    }
+    if (rep_bandwidth_val && tmp_str[0] != '\0') {
+        url = av_strireplace(tmp_str, "$Bandwidth$", (const char*)rep_bandwidth_val);
+        if (!url) {
+            return NULL;
+        }
+    }
+    return url;
+}
+
+static char *get_val_from_nodes_tab(xmlNodePtr *nodes, const int n_nodes, const char *attrname)
+{
+    int i;
+    char *val;
+
+    for (i = 0; i < n_nodes; ++i) {
+        if (nodes[i]) {
+            val = xmlGetProp(nodes[i], attrname);
+            if (val)
+                return val;
+        }
+    }
+
+    return NULL;
+}
+
+static xmlNodePtr find_child_node_by_name(xmlNodePtr rootnode, const char *nodename)
+{
+    xmlNodePtr node = rootnode;
+    if (!node) {
+        return NULL;
+    }
+
+    node = xmlFirstElementChild(node);
+    while (node) {
+        if (!av_strcasecmp(node->name, nodename)) {
+            return node;
+        }
+        node = xmlNextElementSibling(node);
+    }
+    return NULL;
+}
+
+static int get_repl_pattern_and_format(const char *i_url, const char *i_marker, char **o_pattern, char **o_format)
+{
+    int ret = -1;
+    int marker_len = 0;
+    int format_len = 0;
+    char *prefix = NULL;
+    char *start = NULL;
+    char *end = NULL;
+    char *ptr = NULL;
+
+    if (av_stristr(i_url, i_marker)) {
+        ret = 0;
+        *o_pattern = av_strdup(i_marker);
+        if (!*o_pattern) {
+            return AVERROR(ENOMEM);
+        }
+        *o_format = av_strdup("%"PRId64);
+        if (!*o_format) {
+            av_free(*o_pattern);
+            return AVERROR(ENOMEM);
+        }
+    } else {
+        prefix = av_strdup(i_marker);
+        if (!prefix) {
+            return AVERROR(ENOMEM);
+        }
+        marker_len = strlen(prefix)-1;
+        prefix[marker_len] = '\0';
+        start = av_stristr(i_url, prefix);
+        if (!start)
+            goto finish;
+
+        end = strchr(start + 1, '$');
+        if (!end)
+            goto finish;
+
+        if (start[marker_len] != '%')
+            goto finish;
+
+        if (end[-1] != 'd')
+            goto finish;
+
+        format_len = end - start - marker_len - 1 + strlen(PRId64);
+        *o_format = av_mallocz(format_len+1);
+        if (!*o_format) {
+            ret = AVERROR(ENOMEM);
+            goto finish;
+        }
+
+        for(ptr = start + marker_len; ptr < (end - 1); ptr++) {  /*there is need to check this condition :P */
+            if (*ptr != '0') {
+                /* Unknown format add log here */
+                goto finish;
+            }
+        }
+        av_strlcpy(*o_format, start + marker_len, end - start - marker_len -1);
+        av_strlcat(*o_format, PRId64, strlen(*o_format) + strlen(PRId64));
+        *o_pattern = av_mallocz(end - start + 2);
+        if (!*o_pattern) {
+            ret = AVERROR(ENOMEM);
+            av_free(*o_format);
+            goto finish;
+        }
+        av_strlcpy(*o_pattern, start, end - start + 1);
+        ret = 0;
+
+finish:
+        av_free(prefix);
+    }
+
+    return ret;
+}
+
+static enum AVMediaType get_content_type(xmlNodePtr node)
+{
+    enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
+    int i = 0;
+    const char *attr;
+    char *val = NULL;
+
+    if (node) {
+        for (i = 0; i < 2; i++) {
+            attr = i ? "mimeType" : "contentType";
+            val = xmlGetProp(node, attr);
+            if (val) {
+                if (av_stristr((const char *)val, "video")) {
+                    type = AVMEDIA_TYPE_VIDEO;
+                } else if (av_stristr((const char *)val, "audio")) {
+                    type = AVMEDIA_TYPE_AUDIO;
+                }
+                av_free(val);
+            }
+        }
+    }
+    return type;
+}
+
+static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representation *rep,
+                                         xmlNodePtr fragmenturl_node,
+                                         xmlNodePtr *baseurl_nodes,
+                                         char *rep_id_val,
+                                         char *rep_bandwidth_val)
+{
+    char *initialization_val = NULL;
+    char *media_val = NULL;
+
+    if (!av_strcasecmp(fragmenturl_node->name, (const char *)"Initialization")) {
+        initialization_val = xmlGetProp(fragmenturl_node, "sourceURL");
+        if (initialization_val) {
+            rep->init_section = av_mallocz(sizeof(struct fragment));
+            if (!rep->init_section) {
+                av_free(initialization_val);
+                return AVERROR(ENOMEM);
+            }
+            rep->init_section->url = get_content_url(baseurl_nodes, 4,
+                                                     rep_id_val,
+                                                     rep_bandwidth_val,
+                                                     initialization_val);
+            if (!rep->init_section->url) {
+                av_free(rep->init_section);
+                av_free(initialization_val);
+                return AVERROR(ENOMEM);
+            }
+            rep->init_section->size = -1;
+            av_free(initialization_val);
+        }
+    } else if (!av_strcasecmp(fragmenturl_node->name, (const char *)"SegmentURL")) {
+        media_val = xmlGetProp(fragmenturl_node, "media");
+        if (media_val) {
+            struct fragment *seg = av_mallocz(sizeof(struct fragment));
+            if (!seg) {
+                av_free(media_val);
+                return AVERROR(ENOMEM);
+            }
+            seg->url = get_content_url(baseurl_nodes, 4,
+                                       rep_id_val,
+                                       rep_bandwidth_val,
+                                       media_val);
+            if (!seg->url) {
+                av_free(seg);
+                av_free(media_val);
+                return AVERROR(ENOMEM);
+            }
+            seg->size = -1;
+            dynarray_add(&rep->fragments, &rep->n_fragments, seg);
+            av_free(media_val);
+        }
+    }
+
+    return 0;
+}
+
+static int parse_manifest_segmenttimeline(AVFormatContext *s, struct representation *rep,
+                                          xmlNodePtr fragment_timeline_node)
+{
+    xmlAttrPtr attr = NULL;
+    char *val  = NULL;
+
+    if (!av_strcasecmp(fragment_timeline_node->name, (const char *)"S")) {
+        struct timeline *tml = av_mallocz(sizeof(struct timeline));
+        if (!tml) {
+            return AVERROR(ENOMEM);
+        }
+        attr = fragment_timeline_node->properties;
+        while (attr) {
+            val = xmlGetProp(fragment_timeline_node, attr->name);
+
+            if (!val) {
+                av_log(s, AV_LOG_WARNING, "parse_manifest_segmenttimeline attr->name = %s val is NULL\n", attr->name);
+                continue;
+            }
+
+            if (!av_strcasecmp(attr->name, (const char *)"t")) {
+                tml->starttime = (int64_t)strtoll(val, NULL, 10);
+            } else if (!av_strcasecmp(attr->name, (const char *)"r")) {
+                tml->repeat =(int64_t) strtoll(val, NULL, 10);
+            } else if (!av_strcasecmp(attr->name, (const char *)"d")) {
+                tml->duration = (int64_t)strtoll(val, NULL, 10);
+            }
+            attr = attr->next;
+            av_free(val);
+        }
+        dynarray_add(&rep->timelines, &rep->n_timelines, tml);
+    }
+
+    return 0;
+}
+
+static int parse_manifest_representation(AVFormatContext *s, const char *url,
+                                         xmlNodePtr node,
+                                         xmlNodePtr adaptionset_node,
+                                         xmlNodePtr mpd_baseurl_node,
+                                         xmlNodePtr period_baseurl_node,
+                                         xmlNodePtr fragment_template_node,
+                                         xmlNodePtr content_component_node,
+                                         xmlNodePtr adaptionset_baseurl_node)
+{
+    int32_t ret = 0;
+    int32_t audio_rep_idx = 0;
+    int32_t video_rep_idx = 0;
+    char *temp_string = NULL;
+    DASHContext *c = s->priv_data;
+    struct representation *rep = NULL;
+    struct fragment *seg = NULL;
+    xmlNodePtr representation_segmenttemplate_node = NULL;
+    xmlNodePtr representation_baseurl_node = NULL;
+    xmlNodePtr representation_segmentlist_node = NULL;
+    xmlNodePtr fragment_timeline_node = NULL;
+    xmlNodePtr fragment_templates_tab[2];
+    char *duration_val = NULL;
+    char *presentation_timeoffset_val = NULL;
+    char *startnumber_val = NULL;
+    char *timescale_val = NULL;
+    char *initialization_val = NULL;
+    char *media_val = NULL;
+    xmlNodePtr baseurl_nodes[4];
+    xmlNodePtr representation_node = node;
+    char *rep_id_val = xmlGetProp(representation_node, "id");
+    char *rep_bandwidth_val = xmlGetProp(representation_node, "bandwidth");
+    enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
+
+    // try get information from representation
+    if (type == AVMEDIA_TYPE_UNKNOWN)
+        type = get_content_type(representation_node);
+    // try get information from contentComponen
+    if (type == AVMEDIA_TYPE_UNKNOWN)
+        type = get_content_type(content_component_node);
+    // try get information from adaption set
+    if (type == AVMEDIA_TYPE_UNKNOWN)
+        type = get_content_type(adaptionset_node);
+    if (type == AVMEDIA_TYPE_UNKNOWN) {
+        av_log(s, AV_LOG_VERBOSE, "Parsing '%s' - skipp not supported representation type\n", url);
+    } else if ((type == AVMEDIA_TYPE_VIDEO && !c->cur_video) || (type == AVMEDIA_TYPE_AUDIO && !c->cur_audio)) {
+        // convert selected representation to our internal struct
+        rep = av_mallocz(sizeof(struct representation));
+        if (!rep) {
+            ret = AVERROR(ENOMEM);
+            goto end;
+        }
+        representation_segmenttemplate_node = find_child_node_by_name(representation_node, "SegmentTemplate");
+        representation_baseurl_node = find_child_node_by_name(representation_node, "BaseURL");
+        representation_segmentlist_node = find_child_node_by_name(representation_node, "SegmentList");
+
+        baseurl_nodes[0] = mpd_baseurl_node;
+        baseurl_nodes[1] = period_baseurl_node;
+        baseurl_nodes[2] = adaptionset_baseurl_node;
+        baseurl_nodes[3] = representation_baseurl_node;
+
+        if (representation_segmenttemplate_node || fragment_template_node) {
+            fragment_timeline_node = NULL;
+            fragment_templates_tab[0] = representation_segmenttemplate_node;
+            fragment_templates_tab[1] = fragment_template_node;
+
+            presentation_timeoffset_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "presentationTimeOffset");
+            duration_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "duration");
+            startnumber_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "startNumber");
+            timescale_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "timescale");
+            initialization_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "initialization");
+            media_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "media");
+
+            if (initialization_val) {
+                rep->init_section = av_mallocz(sizeof(struct fragment));
+                if (!rep->init_section) {
+                    av_free(rep);
+                    ret = AVERROR(ENOMEM);
+                    goto end;
+                }
+                rep->init_section->url = get_content_url(baseurl_nodes, 4, rep_id_val, rep_bandwidth_val, initialization_val);
+                if (!rep->init_section->url) {
+                    av_free(rep->init_section);
+                    av_free(rep);
+                    ret = AVERROR(ENOMEM);
+                    goto end;
+                }
+                rep->init_section->size = -1;
+                av_free(initialization_val);
+            }
+
+            if (media_val) {
+                rep->url_template = get_content_url(baseurl_nodes, 4, rep_id_val, rep_bandwidth_val, media_val);
+                temp_string = rep->url_template;
+                if (temp_string) {
+                    if (av_stristr(temp_string, "$Number")) {
+                        ret = get_repl_pattern_and_format(temp_string, "$Number$", &(rep->url_template_pattern), &(rep->url_template_format));
+                        if (ret < 0) {
+                            av_free(rep->init_section);
+                            av_free(rep->url_template);
+                            av_free(rep);
+                            goto end;
+                        }
+                        rep->tmp_url_type = DASH_TMPL_ID_NUMBER;  /* Number-Based. */
+                    } else if (av_stristr(temp_string, "$Time")) {
+                        ret = get_repl_pattern_and_format(temp_string, "$Time$", &(rep->url_template_pattern), &(rep->url_template_format));
+                        if (ret < 0) {
+                            av_free(rep->init_section);
+                            av_free(rep->url_template);
+                            av_free(rep);
+                            goto end;
+                        }
+                        rep->tmp_url_type = DASH_TMPL_ID_TIME; /* Time-Based. */
+                    } else {
+                        temp_string = NULL;
+                    }
+                }
+                av_free(media_val);
+            }
+
+            if (presentation_timeoffset_val) {
+                rep->presentation_timeoffset = (int64_t) strtoll(presentation_timeoffset_val, NULL, 10);
+                av_free(presentation_timeoffset_val);
+            }
+            if (duration_val) {
+                rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
+                av_free(duration_val);
+            }
+            if (timescale_val) {
+                rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
+                av_free(timescale_val);
+            }
+            if (startnumber_val) {
+                rep->first_seq_no = (int64_t) strtoll(startnumber_val, NULL, 10);
+                av_free(startnumber_val);
+            }
+
+            fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
+
+            if (!fragment_timeline_node)
+                fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline");
+            if (fragment_timeline_node) {
+                fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node);
+                while (fragment_timeline_node) {
+                    ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node);
+                    if (ret < 0) {
+                        return ret;
+                    }
+                    fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node);
+                }
+            }
+        } else if (representation_baseurl_node && !representation_segmentlist_node) {
+            seg = av_mallocz(sizeof(struct fragment));
+            if (!seg) {
+                ret = AVERROR(ENOMEM);
+                goto end;
+            }
+            seg->url = get_content_url(baseurl_nodes, 4, rep_id_val, rep_bandwidth_val, NULL);
+            if (!seg->url) {
+                av_free(seg);
+                ret = AVERROR(ENOMEM);
+                goto end;
+            }
+            seg->size = -1;
+            dynarray_add(&rep->fragments, &rep->n_fragments, seg);
+        } else if (representation_segmentlist_node) {
+            // TODO: https://www.brendanlong.com/the-structure-of-an-mpeg-dash-mpd.html
+            // http://www-itec.uni-klu.ac.at/dash/ddash/mpdGenerator.php?fragmentlength=15&type=full
+            xmlNodePtr fragmenturl_node = NULL;
+            duration_val = xmlGetProp(representation_segmentlist_node, "duration");
+            timescale_val = xmlGetProp(representation_segmentlist_node, "timescale");
+            if (duration_val) {
+                rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
+                av_free(duration_val);
+            }
+            if (timescale_val) {
+                rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
+                av_free(timescale_val);
+            }
+            fragmenturl_node = xmlFirstElementChild(representation_segmentlist_node);
+            while (fragmenturl_node) {
+                ret = parse_manifest_segmenturlnode(s, rep, fragmenturl_node,
+                                                    baseurl_nodes,
+                                                    rep_id_val,
+                                                    rep_bandwidth_val);
+                if (ret < 0) {
+                    return ret;
+                }
+                fragmenturl_node = xmlNextElementSibling(fragmenturl_node);
+            }
+
+            fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
+
+            if (!fragment_timeline_node)
+                fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline");
+            if (fragment_timeline_node) {
+                fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node);
+                while (fragment_timeline_node) {
+                    ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node);
+                    if (ret < 0) {
+                        return ret;
+                    }
+                    fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node);
+                }
+            }
+        } else {
+            free_representation(rep);
+            rep = NULL;
+            av_log(s, AV_LOG_ERROR, "Unknown format of Representation node id[%s] \n", (const char *)rep_id_val);
+        }
+
+        if (rep) {
+            if (rep->fragment_duration > 0 && !rep->fragment_timescale)
+                rep->fragment_timescale = 1;
+            if (type == AVMEDIA_TYPE_VIDEO) {
+                rep->rep_idx = video_rep_idx;
+                c->cur_video = rep;
+            } else {
+                rep->rep_idx = audio_rep_idx;
+                c->cur_audio = rep;
+            }
+        }
+    }
+
+    video_rep_idx += type == AVMEDIA_TYPE_VIDEO;
+    audio_rep_idx += type == AVMEDIA_TYPE_AUDIO;
+
+end:
+    if (rep_id_val)
+        av_free(rep_id_val);
+    if (rep_bandwidth_val)
+        av_free(rep_bandwidth_val);
+
+    return ret;
+}
+
+static int parse_manifest_adaptationset(AVFormatContext *s, const char *url,
+                                        xmlNodePtr adaptionset_node,
+                                        xmlNodePtr mpd_baseurl_node,
+                                        xmlNodePtr period_baseurl_node)
+{
+    int ret = 0;
+    xmlNodePtr fragment_template_node = NULL;
+    xmlNodePtr content_component_node = NULL;
+    xmlNodePtr adaptionset_baseurl_node = NULL;
+    xmlNodePtr node = NULL;
+
+    node = xmlFirstElementChild(adaptionset_node);
+    while (node) {
+        if (!av_strcasecmp(node->name, (const char *)"SegmentTemplate")) {
+            fragment_template_node = node;
+        } else if (!av_strcasecmp(node->name, (const char *)"ContentComponent")) {
+            content_component_node = node;
+        } else if (!av_strcasecmp(node->name, (const char *)"BaseURL")) {
+            adaptionset_baseurl_node = node;
+        } else if (!av_strcasecmp(node->name, (const char *)"Representation")) {
+            ret = parse_manifest_representation(s, url, node,
+                                                adaptionset_node,
+                                                mpd_baseurl_node,
+                                                period_baseurl_node,
+                                                fragment_template_node,
+                                                content_component_node,
+                                                adaptionset_baseurl_node);
+            if (ret < 0) {
+                return ret;
+            }
+        }
+        node = xmlNextElementSibling(node);
+    }
+    return 0;
+}
+
+static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
+{
+    DASHContext *c = s->priv_data;
+    int ret = 0;
+    int close_in = 0;
+    uint8_t *new_url = NULL;
+    int64_t filesize = 0;
+    char *buffer = NULL;
+    AVDictionary *opts = NULL;
+    xmlDoc *doc = NULL;
+    xmlNodePtr root_element = NULL;
+    xmlNodePtr node = NULL;
+    xmlNodePtr period_node = NULL;
+    xmlNodePtr mpd_baseurl_node = NULL;
+    xmlNodePtr period_baseurl_node = NULL;
+    xmlNodePtr adaptionset_node = NULL;
+    xmlAttrPtr attr = NULL;
+    char *val  = NULL;
+    uint32_t perdiod_duration_sec = 0;
+    uint32_t perdiod_start_sec = 0;
+    int32_t audio_rep_idx = 0;
+    int32_t video_rep_idx = 0;
+
+    if (!in) {
+        close_in = 1;
+
+        set_httpheader_options(c, opts);
+        ret = avio_open2(&in, url, AVIO_FLAG_READ, c->interrupt_callback, &opts);
+        av_dict_free(&opts);
+        if (ret < 0)
+            return ret;
+    }
+
+    if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0) {
+        c->base_url = av_strdup(new_url);
+    } else {
+        c->base_url = av_strdup(url);
+    }
+
+    if(!c->base_url) {
+        return AVERROR(ENOMEM);
+    }
+
+    filesize = avio_size(in);
+    if (filesize <= 0) {
+        filesize = 8 * 1024;
+    }
+
+    buffer = av_mallocz(filesize);
+    if (!buffer) {
+        av_free(c->base_url);
+        return AVERROR(ENOMEM);
+    }
+
+    filesize = avio_read(in, buffer, filesize);
+    if (filesize <= 0) {
+        av_log(s, AV_LOG_ERROR, "Unable to read to offset '%s'\n", url);
+        ret = AVERROR_INVALIDDATA;
+    } else {
+        LIBXML_TEST_VERSION
+
+        doc = xmlReadMemory(buffer, filesize, c->base_url, NULL, 0);
+        root_element = xmlDocGetRootElement(doc);
+        node = root_element;
+
+        if (!node) {
+            ret = AVERROR_INVALIDDATA;
+            av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing root node\n", url);
+            goto cleanup;
+        }
+
+        if (node->type != XML_ELEMENT_NODE ||
+            av_strcasecmp(node->name, (const char *)"MPD")) {
+            ret = AVERROR_INVALIDDATA;
+            av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - wrong root node name[%s] type[%d]\n", url, node->name, (int)node->type);
+            goto cleanup;
+        }
+
+        val = xmlGetProp(node, "type");
+        if (!val) {
+            av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing type attrib\n", url);
+            ret = AVERROR_INVALIDDATA;
+            goto cleanup;
+        }
+        if (!av_strcasecmp(val, (const char *)"dynamic"))
+            c->is_live = 1;
+        av_free(val);
+
+        attr = node->properties;
+        while (attr) {
+            val = xmlGetProp(node, attr->name);
+
+            if (!av_strcasecmp(attr->name, (const char *)"availabilityStartTime")) {
+                c->availability_start_time = get_utc_date_time_insec(s, (const char *)val);
+            } else if (!av_strcasecmp(attr->name, (const char *)"publishTime")) {
+                c->publish_time = get_utc_date_time_insec(s, (const char *)val);
+            } else if (!av_strcasecmp(attr->name, (const char *)"minimumUpdatePeriod")) {
+                c->minimum_update_period = get_duration_insec(s, (const char *)val);
+            } else if (!av_strcasecmp(attr->name, (const char *)"timeShiftBufferDepth")) {
+                c->time_shift_buffer_depth = get_duration_insec(s, (const char *)val);
+            } else if (!av_strcasecmp(attr->name, (const char *)"minBufferTime")) {
+                c->min_buffer_time = get_duration_insec(s, (const char *)val);
+            } else if (!av_strcasecmp(attr->name, (const char *)"suggestedPresentationDelay")) {
+                c->suggested_presentation_delay = get_duration_insec(s, (const char *)val);
+            } else if (!av_strcasecmp(attr->name, (const char *)"mediaPresentationDuration")) {
+                c->media_presentation_duration = get_duration_insec(s, (const char *)val);
+            }
+            attr = attr->next;
+            av_free(val);
+        }
+
+        mpd_baseurl_node = find_child_node_by_name(node, "BaseURL");
+
+        // at now we can handle only one period, with the longest duration
+        node = xmlFirstElementChild(node);
+        while (node) {
+            if (!strcasecmp(node->name, (const char *)"Period")) {
+                perdiod_duration_sec = 0;
+                perdiod_start_sec = 0;
+                attr = node->properties;
+                while (attr) {
+                    val = xmlGetProp(node, attr->name);
+                    if (!av_strcasecmp(attr->name, (const char *)"duration")) {
+                        perdiod_duration_sec = get_duration_insec(s, (const char *)val);
+                    } else if (!av_strcasecmp(attr->name, (const char *)"start")) {
+                        perdiod_start_sec = get_duration_insec(s, (const char *)val);
+                    }
+                    attr = attr->next;
+                    av_free(val);
+                }
+                if ((perdiod_duration_sec) >= (c->period_duration)) {
+                    period_node = node;
+                    c->period_duration = perdiod_duration_sec;
+                    c->period_start = perdiod_start_sec;
+                    if (c->period_start > 0)
+                        c->media_presentation_duration = c->period_duration;
+                }
+            }
+            node = xmlNextElementSibling(node);
+        }
+        if (!period_node) {
+            av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing Period node\n", url);
+            ret = AVERROR_INVALIDDATA;
+            goto cleanup;
+        }
+
+        adaptionset_node = xmlFirstElementChild(period_node);
+        while (adaptionset_node) {
+            if (!av_strcasecmp(adaptionset_node->name, (const char *)"BaseURL")) {
+                period_baseurl_node = adaptionset_node;
+            } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"AdaptationSet")) {
+                parse_manifest_adaptationset(s, url, adaptionset_node, mpd_baseurl_node, period_baseurl_node);
+            }
+            adaptionset_node = xmlNextElementSibling(adaptionset_node);
+        }
+        if (c->cur_video) {
+            c->cur_video->rep_count = video_rep_idx;
+            c->cur_video->fix_multiple_stsd_order = 1;
+            av_log(s, AV_LOG_VERBOSE, "rep_idx[%d]\n", (int)c->cur_video->rep_idx);
+            av_log(s, AV_LOG_VERBOSE, "rep_count[%d]\n", (int)video_rep_idx);
+        }
+        if (c->cur_audio) {
+            c->cur_audio->rep_count = audio_rep_idx;
+        }
+cleanup:
+        /*free the document */
+        xmlFreeDoc(doc);
+        xmlCleanupParser();
+    }
+
+    av_free(new_url);
+    av_free(buffer);
+    if (close_in) {
+        avio_close(in);
+    }
+    return ret;
+}
+
+static int64_t calc_cur_seg_no(AVFormatContext *s, struct representation *pls)
+{
+    DASHContext *c = s->priv_data;
+    int64_t num = 0;
+    int64_t start_time_offset = 0;
+
+    if (c->is_live) {
+        if (pls->n_fragments) {
+            num = pls->first_seq_no;
+        } else if (pls->n_timelines) {
+            start_time_offset = get_segment_start_time_based_on_timeline(pls, 0xFFFFFFFF) - pls->timelines[pls->first_seq_no]->starttime; // total duration of playlist
+            if (start_time_offset < 60 * pls->fragment_timescale)
+                start_time_offset = 0;
+            else
+                start_time_offset = start_time_offset - 60 * pls->fragment_timescale;
+
+            num = calc_next_seg_no_from_timelines(pls, pls->timelines[pls->first_seq_no]->starttime + start_time_offset);
+            if (num == -1)
+                num = pls->first_seq_no;
+        } else if (pls->fragment_duration){
+            if (pls->presentation_timeoffset) {
+                num = pls->presentation_timeoffset * pls->fragment_timescale / pls->fragment_duration;
+            } else if (c->publish_time > 0 && !c->availability_start_time) {
+                num = pls->first_seq_no + (((c->publish_time - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
+            } else {
+                num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
+            }
+        }
+    } else {
+        num = pls->first_seq_no;
+    }
+    return num;
+}
+
+static int64_t calc_min_seg_no(AVFormatContext *s, struct representation *pls)
+{
+    DASHContext *c = s->priv_data;
+    int64_t num = 0;
+
+    if (c->is_live && pls->fragment_duration) {
+        num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->time_shift_buffer_depth) * pls->fragment_timescale) / pls->fragment_duration;
+    } else {
+        num = pls->first_seq_no;
+    }
+    return num;
+}
+
+static int64_t calc_max_seg_no(struct representation *pls)
+{
+    DASHContext *c = pls->parent->priv_data;
+    int64_t num = 0;
+
+    if (pls->n_fragments) {
+        num = pls->first_seq_no + pls->n_fragments - 1;
+    } else if (pls->n_timelines) {
+        int i = 0;
+        num = pls->first_seq_no + pls->n_timelines - 1;
+        for (i = 0; i < pls->n_timelines; i++) {
+            num += pls->timelines[i]->repeat;
+        }
+    } else if (c->is_live && pls->fragment_duration) {
+        num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time)) * pls->fragment_timescale)  / pls->fragment_duration;
+    } else if (pls->fragment_duration) {
+        num = pls->first_seq_no + (c->media_presentation_duration * pls->fragment_timescale) / pls->fragment_duration;
+    }
+
+    return num;
+}
+
+static void move_timelines(struct representation *rep_src, struct representation *rep_dest)
+{
+    if (rep_dest && rep_src ) {
+        free_timelines_list(rep_dest);
+        rep_dest->timelines    = rep_src->timelines;
+        rep_dest->n_timelines  = rep_src->n_timelines;
+        rep_dest->first_seq_no = rep_src->first_seq_no;
+        rep_dest->last_seq_no = calc_max_seg_no(rep_dest);
+        rep_src->timelines = NULL;
+        rep_src->n_timelines = 0;
+        rep_dest->cur_seq_no = rep_src->cur_seq_no;
+    }
+}
+
+static void move_segments(struct representation *rep_src, struct representation *rep_dest)
+{
+    if (rep_dest && rep_src ) {
+        free_fragment_list(rep_dest);
+        if (rep_src->start_number > (rep_dest->start_number + rep_dest->n_fragments))
+            rep_dest->cur_seq_no = 0;
+        else
+            rep_dest->cur_seq_no += rep_src->start_number - rep_dest->start_number;
+        rep_dest->fragments    = rep_src->fragments;
+        rep_dest->n_fragments  = rep_src->n_fragments;
+        rep_dest->parent  = rep_src->parent;
+        rep_dest->last_seq_no = calc_max_seg_no(rep_dest);
+        rep_src->fragments = NULL;
+        rep_src->n_fragments = 0;
+    }
+}
+
+
+static int refresh_manifest(AVFormatContext *s)
+{
+
+    int ret = 0;
+    DASHContext *c = s->priv_data;
+
+    // save current context
+    struct representation *cur_video =  c->cur_video;
+    struct representation *cur_audio =  c->cur_audio;
+    char *base_url = c->base_url;
+
+    c->base_url = NULL;
+    c->cur_video = NULL;
+    c->cur_audio = NULL;
+    ret = parse_manifest(s, s->filename, NULL);
+    if (ret)
+        goto finish;
+
+    if (cur_video && cur_video->timelines || cur_audio && cur_audio->timelines) {
+        // calc current time
+        int64_t currentVideoTime = 0;
+        int64_t currentAudioTime = 0;
+        if (cur_video && cur_video->timelines)
+            currentVideoTime = get_segment_start_time_based_on_timeline(cur_video, cur_video->cur_seq_no) / cur_video->fragment_timescale;
+        if (cur_audio && cur_audio->timelines)
+            currentAudioTime = get_segment_start_time_based_on_timeline(cur_audio, cur_audio->cur_seq_no) / cur_audio->fragment_timescale;
+        // update segments
+        if (cur_video && cur_video->timelines) {
+            c->cur_video->cur_seq_no = calc_next_seg_no_from_timelines(c->cur_video, currentVideoTime * cur_video->fragment_timescale - 1);
+            if (c->cur_video->cur_seq_no >= 0) {
+                move_timelines(c->cur_video, cur_video);
+            }
+        }
+        if (cur_audio && cur_audio->timelines) {
+            c->cur_audio->cur_seq_no = calc_next_seg_no_from_timelines(c->cur_audio, currentAudioTime * cur_audio->fragment_timescale - 1);
+            if (c->cur_audio->cur_seq_no >= 0) {
+               move_timelines(c->cur_audio, cur_audio);
+            }
+        }
+    }
+    if (cur_video && cur_video->fragments) {
+        move_segments(c->cur_video, cur_video);
+    }
+    if (cur_audio && cur_audio->fragments) {
+        move_segments(c->cur_audio, cur_audio);
+    }
+
+finish:
+    // restore context
+    if (c->base_url)
+        av_free(base_url);
+    else
+        c->base_url  = base_url;
+    if (c->cur_audio)
+        free_representation(c->cur_audio);
+    if (c->cur_video)
+        free_representation(c->cur_video);
+    c->cur_audio = cur_audio;
+    c->cur_video = cur_video;
+    return ret;
+}
+
+static int get_segment_filename(char *buf, int buf_size, const char *path, int64_t number, int flags)
+{
+    const char *p;
+    char *q, buf1[20], c;
+    int nd, len, percentd_found;
+
+    q = buf;
+    p = path;
+    percentd_found = 0;
+    for (;;) {
+        c = *p++;
+        if (c == '\0')
+            break;
+        if (c == '%') {
+retry:
+            do {
+                nd = 0;
+                while (av_isdigit(*p))
+                    nd = nd * 10 + *p++ - '0';
+                c = *p++;
+            } while (av_isdigit(c));
+
+            switch (c) {
+            case '%':
+                goto addchar;
+            case 'd':
+                if (!(flags & AV_FRAME_FILENAME_FLAGS_MULTIPLE) && percentd_found)
+                    goto fail;
+                percentd_found = 1;
+                if (number < 0)
+                    nd += 1;
+                snprintf(buf1, sizeof(buf1), "%0*"PRId64, nd, number);
+                len = strlen(buf1);
+                if ((q - buf + len) > buf_size - 1)
+                    goto fail;
+                memcpy(q, buf1, len);
+                q += len;
+                break;
+
+            case 'l':
+                goto retry;
+                break;
+
+            default:
+                goto fail;
+            }
+        } else {
+addchar:
+            if ((q - buf) < buf_size - 1)
+                *q++ = c;
+        }
+    }
+    if (!percentd_found)
+        goto fail;
+    *q = '\0';
+    return 0;
+fail:
+    *q = '\0';
+    return -1;
+}
+
+static struct fragment *get_current_fragment(struct representation *pls)
+{
+    int64_t min_seq_no = 0;
+    int64_t max_seq_no = 0;
+    struct fragment *seg = NULL;
+    struct fragment *seg_ptr = NULL;
+    DASHContext *c = pls->parent->priv_data;
+
+    while (( !ff_check_interrupt(c->interrupt_callback)&& pls->n_fragments > 0)) {
+        if (pls->cur_seq_no < pls->n_fragments) {
+            seg_ptr = pls->fragments[pls->cur_seq_no];
+            seg = av_mallocz(sizeof(struct fragment));
+            if (!seg) {
+                return NULL;
+            }
+            seg->url = av_strdup(seg_ptr->url);
+            if (!seg->url) {
+                av_free(seg);
+                return NULL;
+            }
+            seg->size = seg_ptr->size;
+            seg->url_offset = seg_ptr->url_offset;
+            return seg;
+        } else if (c->is_live) {
+            refresh_manifest(pls->parent);
+        } else {
+            break;
+        }
+    }
+    if (c->is_live) {
+        min_seq_no = calc_min_seg_no(pls->parent, pls);
+        max_seq_no = calc_max_seg_no(pls);
+
+        if (pls->timelines || pls->fragments) {
+            refresh_manifest(pls->parent);
+        }
+        if (pls->cur_seq_no <= min_seq_no) {
+            av_log(pls->parent, AV_LOG_VERBOSE, "old fragment: cur[%"PRId64"] min[%"PRId64"] max[%"PRId64"], playlist %d\n", (int64_t)pls->cur_seq_no, min_seq_no, max_seq_no, (int)pls->rep_idx);
+            pls->cur_seq_no = calc_cur_seg_no(pls->parent, pls);
+        } else if (pls->cur_seq_no > max_seq_no) {
+            av_log(pls->parent, AV_LOG_VERBOSE, "new fragment: min[%"PRId64"] max[%"PRId64"], playlist %d\n", min_seq_no, max_seq_no, (int)pls->rep_idx);
+        }
+        seg = av_mallocz(sizeof(struct fragment));
+        if (!seg) {
+            return NULL;
+        }
+    } else if (pls->cur_seq_no <= pls->last_seq_no) {
+        seg = av_mallocz(sizeof(struct fragment));
+        if (!seg) {
+            return NULL;
+        }
+    }
+    if (seg) {
+        if (pls->tmp_url_type != DASH_TMPL_ID_UNDEFINED) {
+            int64_t val = pls->tmp_url_type == DASH_TMPL_ID_NUMBER ? pls->cur_seq_no : get_segment_start_time_based_on_timeline(pls, pls->cur_seq_no);
+            char tmpfilename[MAX_URL_SIZE];
+
+            if (!pls->url_template_format) {
+                av_log(pls->parent, AV_LOG_ERROR, "url_template_format is not safe, segment filename template %s\n", pls->url_template);
+                return NULL;
+            }
+
+            if (get_segment_filename(tmpfilename, sizeof(tmpfilename), pls->url_template_format, val, 0) < 0) {
+                av_log(pls->parent, AV_LOG_ERROR, "Invalid segment filename template %s\n", pls->url_template);
+                return NULL;
+            }
+            seg->url = av_strireplace(pls->url_template, pls->url_template_pattern, tmpfilename);
+        }
+
+        if (!seg->url) {
+            av_log(pls->parent, AV_LOG_WARNING, "Unable to resolve template url '%s', try to use origin template\n", pls->url_template);
+            seg->url = av_strdup(pls->url_template);
+            if (!seg->url) {
+                av_log(pls->parent, AV_LOG_ERROR, "Cannot resolve template url '%s'\n", pls->url_template);
+                return NULL;
+            }
+        }
+
+        seg->size = -1;
+    }
+
+    return seg;
+}
+
+enum ReadFromURLMode {
+    READ_NORMAL,
+    READ_COMPLETE,
+};
+
+static int read_from_url(struct representation *pls, struct fragment *seg,
+                         uint8_t *buf, int buf_size,
+                         enum ReadFromURLMode mode)
+{
+    int ret;
+
+    /* limit read if the fragment was only a part of a file */
+    if (seg->size >= 0)
+        buf_size = FFMIN(buf_size, pls->cur_seg_size - pls->cur_seg_offset);
+
+    if (mode == READ_COMPLETE) {
+        ret = avio_read(pls->input, buf, buf_size);
+        if (ret < buf_size) {
+            av_log(pls->parent, AV_LOG_WARNING, "Could not read complete fragment.\n");
+        }
+    } else {
+        ret = avio_read(pls->input, buf, buf_size);
+    }
+    if (ret > 0)
+        pls->cur_seg_offset += ret;
+
+    return ret;
+}
+
+static int open_input(DASHContext *c, struct representation *pls, struct fragment *seg)
+{
+    AVDictionary *opts = NULL;
+    char url[MAX_URL_SIZE];
+    int ret;
+
+    set_httpheader_options(c, opts);
+    if (seg->size >= 0) {
+        /* try to restrict the HTTP request to the part we want
+         * (if this is in fact a HTTP request) */
+        av_dict_set_int(&opts, "offset", seg->url_offset, 0);
+        av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
+    }
+
+    ff_make_absolute_url(url, MAX_URL_SIZE, c->base_url, seg->url);
+    av_log(pls->parent, AV_LOG_VERBOSE, "DASH request for url '%s', offset %"PRId64", playlist %d\n",
+           url, seg->url_offset, pls->rep_idx);
+    ret = open_url(pls->parent, &pls->input, url, c->avio_opts, opts, NULL);
+    if (ret < 0) {
+        goto cleanup;
+    }
+
+    /* Seek to the requested position. If this was a HTTP request, the offset
+     * should already be where want it to, but this allows e.g. local testing
+     * without a HTTP server. */
+    if (!ret && seg->url_offset) {
+        int64_t seekret = avio_seek(pls->input, seg->url_offset, SEEK_SET);
+        if (seekret < 0) {
+            av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of DASH fragment '%s'\n", seg->url_offset, seg->url);
+            ret = (int) seekret;
+            ff_format_io_close(pls->parent, &pls->input);
+        }
+    }
+
+cleanup:
+    av_dict_free(&opts);
+    pls->cur_seg_offset = 0;
+    pls->cur_seg_size = seg->size;
+    return ret;
+}
+
+static int update_init_section(struct representation *pls)
+{
+    static const int max_init_section_size = 1024 * 1024;
+    DASHContext *c = pls->parent->priv_data;
+    int64_t sec_size;
+    int64_t urlsize;
+    int ret;
+
+    if (!pls->init_section || pls->init_sec_buf)
+        return 0;
+
+    ret = open_input(c, pls, pls->init_section);
+    if (ret < 0) {
+        av_log(pls->parent, AV_LOG_WARNING,
+               "Failed to open an initialization section in playlist %d\n",
+               pls->rep_idx);
+        return ret;
+    }
+
+    if (pls->init_section->size >= 0)
+        sec_size = pls->init_section->size;
+    else if ((urlsize = avio_size(pls->input)) >= 0)
+        sec_size = urlsize;
+    else
+        sec_size = max_init_section_size;
+
+    av_log(pls->parent, AV_LOG_DEBUG,
+           "Downloading an initialization section of size %"PRId64"\n",
+           sec_size);
+
+    sec_size = FFMIN(sec_size, max_init_section_size);
+
+    av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
+
+    ret = read_from_url(pls, pls->init_section, pls->init_sec_buf,
+                        pls->init_sec_buf_size, READ_COMPLETE);
+    ff_format_io_close(pls->parent, &pls->input);
+
+    if (ret < 0)
+        return ret;
+
+    pls->init_sec_data_len = ret;
+    pls->init_sec_buf_read_offset = 0;
+
+    return 0;
+}
+
+static int64_t seek_data(void *opaque, int64_t offset, int whence)
+{
+    struct representation *v = opaque;
+    if (v->n_fragments && !v->init_sec_data_len) {
+        return avio_seek(v->input, offset, whence);
+    }
+
+    return AVERROR(ENOSYS);
+}
+
+static int read_data(void *opaque, uint8_t *buf, int buf_size)
+{
+    int ret = 0;
+    struct representation *v = opaque;
+    DASHContext *c = v->parent->priv_data;
+
+restart:
+    if (!v->input) {
+        free_fragment(&v->cur_seg);
+        v->cur_seg = get_current_fragment(v);
+        if (!v->cur_seg) {
+            ret = AVERROR_EOF;
+            goto end;
+        }
+
+        /* load/update Media Initialization Section, if any */
+        ret = update_init_section(v);
+        if (ret)
+            goto end;
+
+        ret = open_input(c, v, v->cur_seg);
+        if (ret < 0) {
+            if (ff_check_interrupt(c->interrupt_callback)) {
+                goto end;
+                ret = AVERROR_EXIT;
+            }
+            av_log(v->parent, AV_LOG_WARNING, "Failed to open fragment of playlist %d\n", v->rep_idx);
+            v->cur_seq_no++;
+            goto restart;
+        }
+    }
+
+    if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
+        /* Push init section out first before first actual fragment */
+        int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
+        memcpy(buf, v->init_sec_buf, copy_size);
+        v->init_sec_buf_read_offset += copy_size;
+        ret = copy_size;
+        goto end;
+    }
+
+    /* check the v->cur_seg, if it is null, get current and double check if the new v->cur_seg*/
+    if (!v->cur_seg) {
+        v->cur_seg = get_current_fragment(v);
+    }
+    if (!v->cur_seg) {
+        ret = AVERROR_EOF;
+        goto end;
+    }
+    ret = read_from_url(v, v->cur_seg, buf, buf_size, READ_NORMAL);
+    if (ret > 0)
+        goto end;
+
+    if (!v->is_restart_needed)
+        v->cur_seq_no++;
+    v->is_restart_needed = 1;
+
+end:
+    return ret;
+}
+
+static int save_avio_options(AVFormatContext *s)
+{
+    DASHContext *c = s->priv_data;
+    const char *opts[] = { "headers", "user_agent", "user-agent", "cookies", NULL }, **opt = opts;
+    uint8_t *buf = NULL;
+    int ret = 0;
+
+    while (*opt) {
+        if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
+            if (buf[0] != '\0') {
+                ret = av_dict_set(&c->avio_opts, *opt, buf, AV_DICT_DONT_STRDUP_VAL);
+                if (ret < 0)
+                    return ret;
+            }
+        }
+        opt++;
+    }
+
+    return ret;
+}
+
+static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
+                          int flags, AVDictionary **opts)
+{
+    av_log(s, AV_LOG_ERROR,
+           "A DASH playlist item '%s' referred to an external file '%s'. "
+           "Opening this file was forbidden for security reasons\n",
+           s->filename, url);
+    return AVERROR(EPERM);
+}
+
+static int reopen_demux_for_component(AVFormatContext *s, struct representation *pls)
+{
+    DASHContext *c = s->priv_data;
+    AVInputFormat *in_fmt = NULL;
+    AVDictionary  *in_fmt_opts = NULL;
+    uint8_t *avio_ctx_buffer  = NULL;
+    int ret = 0;
+
+    if (pls->ctx) {
+        /* note: the internal buffer could have changed, and be != avio_ctx_buffer */
+        av_freep(&pls->pb.buffer);
+        memset(&pls->pb, 0x00, sizeof(AVIOContext));
+        pls->ctx->pb = NULL;
+        avformat_close_input(&pls->ctx);
+        pls->ctx = NULL;
+    }
+    if (!(pls->ctx = avformat_alloc_context())) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    avio_ctx_buffer  = av_malloc(INITIAL_BUFFER_SIZE);
+    if (!avio_ctx_buffer ) {
+        ret = AVERROR(ENOMEM);
+        avformat_free_context(pls->ctx);
+        pls->ctx = NULL;
+        goto fail;
+    }
+    if (c->is_live) {
+        ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, NULL);
+    } else {
+        ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, seek_data);
+    }
+    pls->pb.seekable = 0;
+
+    if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
+        goto fail;
+
+    pls->ctx->flags = AVFMT_FLAG_CUSTOM_IO;
+    pls->ctx->probesize = 1024 * 4;
+    pls->ctx->max_analyze_duration = 4 * AV_TIME_BASE;
+    ret = av_probe_input_buffer(&pls->pb, &in_fmt, "", NULL, 0, 0);
+    if (ret < 0) {
+        av_log(s, AV_LOG_ERROR, "Error when loading first fragment, playlist %d\n", (int)pls->rep_idx);
+        avformat_free_context(pls->ctx);
+        pls->ctx = NULL;
+        goto fail;
+    }
+
+    pls->ctx->pb = &pls->pb;
+    pls->ctx->io_open  = nested_io_open;
+
+    // provide additional information from mpd if available
+    ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts); //pls->init_section->url
+    av_dict_free(&in_fmt_opts);
+    if (ret < 0)
+        goto fail;
+    if (pls->n_fragments) {
+        ret = avformat_find_stream_info(pls->ctx, NULL);
+        if (ret < 0)
+            goto fail;
+    }
+
+fail:
+    return ret;
+}
+
+static int open_demux_for_component(AVFormatContext *s, struct representation *pls)
+{
+    int ret = 0;
+    int i;
+
+    pls->parent = s;
+    pls->cur_seq_no  = calc_cur_seg_no(s, pls);
+    pls->last_seq_no = calc_max_seg_no(pls);
+
+    ret = reopen_demux_for_component(s, pls);
+    if (ret < 0) {
+        goto fail;
+    }
+    for (i = 0; i < pls->ctx->nb_streams; i++) {
+        AVStream *st = avformat_new_stream(s, NULL);
+        AVStream *ist = pls->ctx->streams[i];
+        if (!st) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        st->id = i;
+        avcodec_parameters_copy(st->codecpar, pls->ctx->streams[i]->codecpar);
+        avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
+    }
+
+    return 0;
+fail:
+    return ret;
+}
+
+static int dash_read_header(AVFormatContext *s)
+{
+    void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
+    DASHContext *c = s->priv_data;
+    int ret = 0;
+    int stream_index = 0;
+
+    c->interrupt_callback = &s->interrupt_callback;
+    // if the URL context is good, read important options we must broker later
+    if (u) {
+        update_options(&c->user_agent, "user-agent", u);
+        update_options(&c->cookies, "cookies", u);
+        update_options(&c->headers, "headers", u);
+    }
+
+    if ((ret = parse_manifest(s, s->filename, s->pb)) < 0)
+        goto fail;
+
+    if ((ret = save_avio_options(s)) < 0)
+        goto fail;
+
+    /* If this isn't a live stream, fill the total duration of the
+     * stream. */
+    if (!c->is_live) {
+        s->duration = (int64_t) c->media_presentation_duration * AV_TIME_BASE;
+    }
+
+    /* Open the demuxer for curent video and current audio components if available */
+    if (!ret && c->cur_video) {
+        ret = open_demux_for_component(s, c->cur_video);
+        if (!ret) {
+            c->cur_video->stream_index = stream_index;
+            ++stream_index;
+        } else {
+            free_representation(c->cur_video);
+            c->cur_video = NULL;
+        }
+    }
+
+    if (!ret && c->cur_audio) {
+        ret = open_demux_for_component(s, c->cur_audio);
+        if (!ret) {
+            c->cur_audio->stream_index = stream_index;
+            ++stream_index;
+        } else {
+            free_representation(c->cur_audio);
+            c->cur_audio = NULL;
+        }
+    }
+
+    if (!stream_index) {
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    /* Create a program */
+    if (!ret) {
+        AVProgram *program;
+        program = av_new_program(s, 0);
+        if (!program) {
+            goto fail;
+        }
+
+        if (c->cur_video) {
+            av_program_add_stream_index(s, 0, c->cur_video->stream_index);
+        }
+        if (c->cur_audio) {
+            av_program_add_stream_index(s, 0, c->cur_audio->stream_index);
+        }
+    }
+
+    return 0;
+fail:
+    return ret;
+}
+
+static int dash_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    DASHContext *c = s->priv_data;
+    int ret = 0;
+    struct representation *cur = NULL;
+
+    if (!c->cur_audio && !c->cur_video ) {
+        return AVERROR_INVALIDDATA;
+    }
+    if (c->cur_audio && !c->cur_video) {
+        cur = c->cur_audio;
+    } else if (!c->cur_audio && c->cur_video) {
+        cur = c->cur_video;
+    } else if (c->cur_video->cur_timestamp < c->cur_audio->cur_timestamp) {
+        cur = c->cur_video;
+    } else {
+        cur = c->cur_audio;
+    }
+
+    if (cur->ctx) {
+        while (!ff_check_interrupt(c->interrupt_callback) && !ret) {
+            ret = av_read_frame(cur->ctx, pkt);
+            if (ret >= 0) {
+                /* If we got a packet, return it */
+                cur->cur_timestamp = av_rescale(pkt->pts, (int64_t)cur->ctx->streams[0]->time_base.num * 90000, cur->ctx->streams[0]->time_base.den);
+                pkt->stream_index = cur->stream_index;
+                return 0;
+            }
+            if (cur->is_restart_needed) {
+                cur->cur_seg_offset = 0;
+                cur->init_sec_buf_read_offset = 0;
+                if (cur->input)
+                    ff_format_io_close(cur->parent, &cur->input);
+                ret = reopen_demux_for_component(s, cur);
+                cur->is_restart_needed = 0;
+            }
+
+        }
+    }
+    return AVERROR_EOF;
+}
+
+static int dash_close(AVFormatContext *s)
+{
+    DASHContext *c = s->priv_data;
+    if (c->cur_audio) {
+        free_representation(c->cur_audio);
+    }
+    if (c->cur_video) {
+        free_representation(c->cur_video);
+    }
+
+    av_freep(&c->cookies);
+    av_freep(&c->user_agent);
+    av_dict_free(&c->avio_opts);
+    av_freep(&c->base_url);
+    return 0;
+}
+
+static int dash_seek(AVFormatContext *s, struct representation *pls, int64_t seek_pos_msec, int flags)
+{
+    int ret = 0;
+    int i = 0;
+    int j = 0;
+    int64_t duration = 0;
+
+    av_log(pls->parent, AV_LOG_VERBOSE, "DASH seek pos[%"PRId64"ms], playlist %d\n", seek_pos_msec, pls->rep_idx);
+
+    // single fragment mode
+    if (pls->n_fragments == 1) {
+        pls->cur_timestamp = 0;
+        pls->cur_seg_offset = 0;
+        ff_read_frame_flush(pls->ctx);
+        return av_seek_frame(pls->ctx, -1, seek_pos_msec * 1000, flags);
+    }
+
+    if (pls->input)
+        ff_format_io_close(pls->parent, &pls->input);
+
+    // find the nearest fragment
+    if (pls->n_timelines > 0 && pls->fragment_timescale > 0) {
+        int64_t num = pls->first_seq_no;
+        av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline start n_timelines[%d] "
+               "last_seq_no[%"PRId64"], playlist %d.\n",
+               (int)pls->n_timelines, (int64_t)pls->last_seq_no, (int)pls->rep_idx);
+        for (i = 0; i < pls->n_timelines; i++) {
+            if (pls->timelines[i]->starttime > 0) {
+                duration = pls->timelines[i]->starttime;
+            }
+            duration += pls->timelines[i]->duration;
+            if (seek_pos_msec < ((duration * 1000) /  pls->fragment_timescale)) {
+                goto set_seq_num;
+            }
+            for (j = 0; j < pls->timelines[i]->repeat; j++) {
+                duration += pls->timelines[i]->duration;
+                num++;
+                if (seek_pos_msec < ((duration * 1000) /  pls->fragment_timescale)) {
+                    goto set_seq_num;
+                }
+            }
+            num++;
+        }
+
+set_seq_num:
+        pls->cur_seq_no = num > pls->last_seq_no ? pls->last_seq_no : num;
+        av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline end cur_seq_no[%"PRId64"], playlist %d.\n",
+               (int64_t)pls->cur_seq_no, (int)pls->rep_idx);
+    } else if (pls->fragment_duration > 0) {
+        pls->cur_seq_no = pls->first_seq_no + ((seek_pos_msec * pls->fragment_timescale) / pls->fragment_duration) / 1000;
+    } else {
+        av_log(pls->parent, AV_LOG_ERROR, "dash_seek missing fragment_duration\n");
+        pls->cur_seq_no = pls->first_seq_no;
+    }
+    pls->cur_timestamp = 0;
+    pls->cur_seg_offset = 0;
+    pls->init_sec_buf_read_offset = 0;
+    ret = reopen_demux_for_component(s, pls);
+
+    return ret;
+}
+
+static int dash_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
+{
+    int ret = 0;
+    DASHContext *c = s->priv_data;
+    int64_t seek_pos_msec = av_rescale_rnd(timestamp, 1000,
+                                           s->streams[stream_index]->time_base.den,
+                                           flags & AVSEEK_FLAG_BACKWARD ?
+                                           AV_ROUND_DOWN : AV_ROUND_UP);
+    if ((flags & AVSEEK_FLAG_BYTE) || c->is_live)
+        return AVERROR(ENOSYS);
+    if (c->cur_audio) {
+        ret = dash_seek(s, c->cur_audio, seek_pos_msec, flags);
+    }
+    if (!ret && c->cur_video) {
+        ret = dash_seek(s, c->cur_video, seek_pos_msec, flags);
+    }
+    return ret;
+}
+
+static int dash_probe(AVProbeData *p)
+{
+    if (!av_stristr(p->buf, "<MPD"))
+        return 0;
+
+    if (av_stristr(p->buf, "dash:profile:isoff-on-demand:2011") ||
+        av_stristr(p->buf, "dash:profile:isoff-live:2011") ||
+        av_stristr(p->buf, "dash:profile:isoff-live:2012") ||
+        av_stristr(p->buf, "dash:profile:isoff-main:2011")) {
+        return AVPROBE_SCORE_MAX;
+    }
+    if (av_stristr(p->buf, "dash:profile")) {
+        return AVPROBE_SCORE_MAX / 2;
+    }
+
+    return 0;
+}
+
+#define OFFSET(x) offsetof(DASHContext, x)
+#define FLAGS AV_OPT_FLAG_DECODING_PARAM
+static const AVOption dash_options[] = {
+    {"allowed_extensions", "List of file extensions that dash is allowed to access",
+        OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
+        {.str = "aac,m4a,m4s,m4v,mov,mp4"},
+        INT_MIN, INT_MAX, FLAGS},
+    {NULL}
+};
+
+static const AVClass dash_class = {
+    .class_name = "dash",
+    .item_name  = av_default_item_name,
+    .option     = dash_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_dash_demuxer = {
+    .name           = "dash",
+    .long_name      = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over HTTP"),
+    .priv_class     = &dash_class,
+    .priv_data_size = sizeof(DASHContext),
+    .read_probe     = dash_probe,
+    .read_header    = dash_read_header,
+    .read_packet    = dash_read_packet,
+    .read_close     = dash_close,
+    .read_seek      = dash_read_seek,
+    .flags          = AVFMT_NO_BYTE_SEEK,
+};
