[FFmpeg-trac] #7986(avformat:new): Initial EXT-X-PROGRAM-DATE-TIME rounded to integer

[FFmpeg]

#7986: Initial EXT-X-PROGRAM-DATE-TIME rounded to integer
-------------------------------------+-------------------------------------
             Reporter:  pavelpi      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:  git-
             Keywords:  hls          |  master
  timestamp                          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 '''Summary of the bug:'''
 recording in DASH format (HLS) outputs m3u8 where EXT-X-PROGRAM-DATE-TIME
 is always floored to seconds while millisecond digits are available in the
 timestamp.

 '''How to reproduce:'''
 {{{
 ffmpeg -f v4l2 -framerate 25 -video_size 720x480 -standard pal -i
 /dev/video0 -vcodec libx264 -r 25 -preset medium -keyint_min 250 -g 250 -f
 hls -hls_flags +program_date_time -hls_segment_type fmp4
 -hls_fmp4_init_filename now.mp4 -use_localtime 1 -hls_list_size 0
 -hls_time 60 -hls_segment_filename %Y-%m-%d_%H-%M-%S.m4s
 /data/video0/now.m3u8
 }}}
 ffmpeg version latest
 built on ubuntu 18.04

 libavformat/hlsenc.h:

 {{{
 if (hls->flags & HLS_PROGRAM_DATE_TIME) {
     time_t now0;
     time(&now0);
     vs->initial_prog_date_time = now0;
 }
 }}}
 time_t is integer and therefore one cannot get millisecond resolution.
 This causes up to 1s error.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7986>
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