[FFmpeg-trac] #7382(avformat:new): ffplay doesn't play dash format with presentationTimeOffset.

[FFmpeg]

#7382: ffplay  doesn't play  dash format with presentationTimeOffset.
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             Reporter:  satbaby   |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:
 here are two examples:
 https://livesim.dashif.org/livesim/periods_60/continuous_1/testpic_2s/Manifest.mpd
 https://akamai-
 axtest.akamaized.net/routes/lapd-v1-acceptance/www_c4/Manifest.mpd

 How to reproduce:
 {{{
 ffplay
 https://livesim.dashif.org/livesim/periods_60/continuous_1/testpic_2s/Manifest.mpd
 ffplay version N-91691-g962c9313af 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. 25.100 / 58. 25.100
   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 @ 0x7f2328000b80] Could not read complete fragment.0B f=0/0
 [https @ 0x7f232800aa00] HTTP error 404 Not Found sq=    0B f=0/0
 [dash @ 0x7f2328000b80] Failed to open fragment of playlist 0
 [https @ 0x7f2328017e40] HTTP error 404 Not Found sq=    0B f=0/0
 [dash @ 0x7f2328000b80] Failed to open fragment of playlist 0
 [https @ 0x7f232804a440] HTTP error 404 Not Found sq=    0B f=0/0
 [dash @ 0x7f2328000b80] Failed to open fragment of playlist 0
 [https @ 0x7f2328041240] HTTP error 404 Not Found sq=    0B f=0/0
 [dash @ 0x7f2328000b80] Failed to open fragment of playlist 0
 [https @ 0x7f232804e040] HTTP error 404 Not Found sq=    0B f=0/0
 [dash @ 0x7f2328000b80] Failed to open fragment of playlist 0
 [https @ 0x7f2328041340] HTTP error 404 Not Found sq=    0B f=0/0
 [dash @ 0x7f2328000b80] Failed to open fragment of playlist 0
 [https @ 0x7f2328018580] HTTP error 404 Not Found sq=    0B f=0/0
 [dash @ 0x7f2328000b80] Failed to open fragment of playlist 0
 [https @ 0x7f2328054a40] HTTP error 404 Not Found sq=    0B f=0/0
 [dash @ 0x7f2328000b80] Failed to open fragment of playlist 0
 }}}
 I have patch, but no idea if is correct:
 cat /tmp/try_to_fix_calc_cur_seg_no_with_presentation_timeoffset.diff
 diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
 index c6dddeb98f..fe6d95102b 100644
 --- a/libavformat/dashdec.c
 +++ b/libavformat/dashdec.c
 @@ -1294,7 +1294,7 @@ static int64_t calc_cur_seg_no(AVFormatContext *s,
 struct representation *pls)
                  num += pls->first_seq_no;
          } else if (pls->fragment_duration){
              if (pls->presentation_timeoffset) {
 -                num = pls->presentation_timeoffset *
 pls->fragment_timescale / pls->fragment_duration;
 +                num = pls->first_seq_no + (((get_current_time_in_sec() *
 pls->fragment_timescale)-pls->presentation_timeoffset) /
 pls->fragment_duration) - 120;
              } 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 {

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Ticket URL: <https://trac.ffmpeg.org/ticket/7382>
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