Hi.
Here is an example:
http://vm2.dashif.org/livesim-dev/testpic_2s/Manifest.mpd

ffplay http://vm2.dashif.org/livesim-dev/testpic_2s/Manifest.mpd
ffplay version N-91650-g6972dae5a4 Copyright (c) 2003-2018 the FFmpeg
developers
  built with gcc 8.2.0 (Gentoo 8.2.0-r2 p1.2)
  configuration: --prefix=/mnt/BIG/ffmpeg/root/ --disable-doc
--disable-stripping --enable-debug=1 --enable-libxml2 --enable-demuxer=dash
--enable-openssl
  libavutil      56. 19.100 / 56. 19.100
  libavcodec     58. 24.100 / 58. 24.100
  libavformat    58. 17.103 / 58. 17.103
  libavdevice    58.  4.101 / 58.  4.101
  libavfilter     7. 26.100 /  7. 26.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
[dash @ 0x7ffa8c000b80] Could not read complete fragment.0B f=0/0
[dash @ 0x7ffa8c000b80] Could not read complete fragment.0B f=0/0
Input #0, dash, from '
http://vm2.dashif.org/livesim-dev/testpic_2s/Manifest.mpd':
  Duration: N/A, start: 1534854670.016000, bitrate: N/A
  Program 0
    Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360,
30 fps, 30 tbr, 90k tbn, 60 tbc
    Metadata:
      variant_bitrate : 300000
      id              : V300
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 48000
      id              : A48
[http @ 0x7ffa8c073fc0] HTTP error 404 Not Found   10KB sq=    0B f=0/0
[dash @ 0x7ffa8c000b80] Failed to open fragment of playlist 0
[http @ 0x7ffa8c074780] HTTP error 404 Not Found    6KB sq=    0B f=0/0
[dash @ 0x7ffa8c000b80] Failed to open fragment of playlist 0
[http @ 0x7ffa8c236200] HTTP error 404 Not Found    0KB sq=    0B f=0/0
[dash @ 0x7ffa8c000b80] Failed to open fragment of playlist 0
[http @ 0x7ffa8c32d940] HTTP error 404 Not Found    0KB sq=    0B f=0/0
[dash @ 0x7ffa8c000b80] Failed to open fragment of playlist 0
[http @ 0x7ffa8c086000] HTTP error 404 Not Found    0KB sq=    0B f=0/0
[dash @ 0x7ffa8c000b80] Failed to open fragment of playlist 0
[http @ 0x7ffa8c2312c0] HTTP error 404 Not Found    0KB sq=    0B f=0/0
[dash @ 0x7ffa8c000b80] Failed to open fragment of playlist 0
[http @ 0x7ffa8c2312c0] HTTP error 404 Not Found    0KB sq=    0B f=0/0
[dash @ 0x7ffa8c000b80] Failed to open fragment of playlist 0
[http @ 0x7ffa8c2312c0] HTTP error 404 Not Found    0KB sq=    0B f=0/0
From 08980973a58afbf441e624f2dcd6b7efb537c97e Mon Sep 17 00:00:00 2001
From: Jacek Jendrzej <overx...@gmail.com>
Date: Tue, 21 Aug 2018 14:15:42 +0200
Subject: [PATCH] lavf/dashdec: Fix calc_cur_seg_no if availability_start_time not
 present

---
 libavformat/dashdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
index c6dddeb98f..85fbe6aacc 100644
--- a/libavformat/dashdec.c
+++ b/libavformat/dashdec.c
@@ -1296,7 +1296,7 @@ static int64_t calc_cur_seg_no(AVFormatContext *s, struct representation *pls)
             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;
+                num = pls->first_seq_no + (((c->publish_time - c->time_shift_buffer_depth + pls->fragment_duration) - 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;
             }
-- 
2.18.0

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