[FFmpeg-trac] #10785(undetermined:new): Unnecessary init segment reloads when playing HLS stream

[FFmpeg]

#10785: Unnecessary init segment reloads when playing HLS stream
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             Reporter:  Daniel       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 I have HLS server which initially sends media playlist with init segment
 and 3 media segments (fMP4 format). Playlist then grows to 5 media
 segments, and after this new segments replace oldest ones so playlist
 always contains 5 segments. I noticed that ffplay reloads init segment
 every time it is present in media playlist. Exact scenario is as follows -
 here is list of files downloaded by ffplay from my HLS server:
 - master playlist
 - media playlist with init segment and media segments 0-2
 - init segment
 - media segment 0
 - media segment 1
 - media segment 2
 - media playlist with init segment and media segments 0-3
 - init segment
 - media segment 3
 - media playlist with init segment and media segments 0-4
 - init segment
 - media segment 4
 - media playlist with media segments 1-5
 - media segment 5
 - media playlist with media segments 2-6
 - media segment 6
 - ... and so on

 Because of this init segment reloading ffplay complains about duplicate
 MOOV Atoms, plus video display is not smooth when it happen. I also tested
 this with GStreamer and it does not reload init segment (I had to increase
 max playlist size to 8 as GStreamer reloads it less often). My
 understanding is that init segments is connected to media segment which it
 precedes (in my case segment 0), so reloading should not happen, like in
 GStreamer.

 ffplay version 4.4.2-0ubuntu0.22.04.1
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Ticket URL: <https://trac.ffmpeg.org/ticket/10785>
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