[FFmpeg-trac] #5940(undetermined:new): hls: hls_list_size breaks program_date_time

[FFmpeg]

#5940: hls: hls_list_size breaks program_date_time
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             Reporter:  ronag        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  hls          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 If using hls_list_size together with program_date_time the EXT-X-PROGRAM-
 DATE-TIME tags start to become wrong when segments are removed.
 initial_prog_date_time should probably be incremented by the duration of
 the segments removed.

 This is because currently because when segments are removed their
 accumulated duration is no longer added to prog_date_time in
 https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/hlsenc.c#L569

 When removing a segment at
 https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/hlsenc.c#L406 we
 should also increment the initial_prog_date_time by the duration of the
 removed segment.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5940>
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