[FFmpeg-trac] #9357(avformat:new): HLS live seek support

[FFmpeg]

#9357: HLS live seek support
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             Reporter:  SuRGeoNix  |                     Type:  enhancement
               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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 The current API (hls demuxer) doesn't seem to provide/expose required
 information to implement HLS live seek as the playlists/segments are not
 known (HLSContext). Even if you just re-opening the format context to
 accomplish this with the 'live_start_index' avdict option you don't have
 the information of the segments/durations.

 Additionally, it seems that the hls demuxer sets AVFMTCTX_UNSEEKABLE flag
 always. Can't see the reason why it applies it for example in this HLS
 live stream (https://cph-p2p-
 msl.akamaized.net/hls/live/2000341/test/level_3.m3u8)

 It has been also seen even after seeking on HLS live stream that the
 timestamps are not related to the previous ones (before seeking) or to the
 first_timestamp or ic->start_time.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9357>
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