[FFmpeg-trac] #8023(undetermined:new): no #EXT-X-DISCONTINUITY is added to hls manifest is source is -f concat

[FFmpeg]

#8023: no #EXT-X-DISCONTINUITY is added to hls manifest is source is -f concat
-------------------------------------+-------------------------------------
             Reporter:  larez        |                     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:

 transmuxing a "-f concat -i concat.lst"  to hls
 should add #EXT-X-DISCONTINUITY after each list item

 How to reproduce:

 1) create concat list of http://...m3u8 files :

 list.txt :
 file 'http://../1.m3u8'
 file 'http://../2.m3u8'
 ..
 file 'http://../n.m3u8'

 2)create master m3u8
 cat <<'IDXEOF' > index.m3u8
 #EXTM3U
 #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=2400000
 hd.m3u8
 IDXEOF

 3) transmux
 h_flags='delete_segments+append_list+omit_endlist'
 hls_opts="-f hls -hls_time 4 -hls_list_size 10 -hls_flags $h_flags
 -hls_allow_cache 0 -start_number 1"

 ffmpeg -v verbose -y -f concat -safe 0 -protocol_whitelist
 "file,http,https,tcp,tls" -re -i list.txt -vstats_file stats.txt  -map
 0:v:1 -c:v copy -copyts -start_at_zero -metadata:s:0 language=eng -map
 0:a:1 -c:a copy -copyts -start_at_zero -metadata:s:1 language=eng -flags
 -global_header  -hls_segment_filename sd_%05d.ts  $hls_opts 'hd.m3u8'
 -map 0:a:1 -c:a copy -copyts -start_at_zero -metadata:s:1 language=eng
 -flags -global_header  -hls_segment_filename hd_%05d.ts  $hls_opts
 'hd.m3u8'


 ffmpeg creates then a readable live (vlc, kaltura hls test player accept
 http://your_hls_live_server/master m3u8) if all m8u8 source items from
 concat list were transcoded in the same way, but it would be better to
 write
 #EXT-X-DISCONTINUITY into hd.m3u8 (in this case) after each
 new source read from the list in case if encoding (or resoution) change.
 ffmpeg signals each new list read in its log, so, the logic could be
 easily added, e.g.
 if source is concat and output is hls => signal discontinuity after the
 end of each source from the list

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Ticket URL: <https://trac.ffmpeg.org/ticket/8023>
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