[FFmpeg-trac] #4048(avformat:new): segment: Handle WebVTT as per HLS spec

[FFmpeg]

#4048: segment: Handle WebVTT as per HLS spec
-------------------------------------+------------------------------------
             Reporter:  11rcombs     |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  hls webvtt   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+------------------------------------

Comment (by Djfe):

 I guess this kinda belongs to this ticket:
 https://amd.cdn.turner.com/adultswim/episodes/no_uk_geo/bobsburgers/2017/03/bobsburgers_cc_505_Digital_IttyBittyDittyCommittee/hls/bobsburgers_cc_505_Digital_IttyBittyDittyCommittee_stream_webvtt.m3u8

 is the webvtt Stream (subtitle only stream) related to
 https://amd.cdn.turner.com/adultswim/episodes/no_uk_geo/bobsburgers/2017/03/bobsburgers_cc_505_Digital_IttyBittyDittyCommittee/hls/bobsburgers_cc_505_Digital_IttyBittyDittyCommittee_stream_full.m3u8

 from http://www.adultswim.com/videos/bobs-burgers/the-itty-bitty-ditty-
 committee/

 Though I'm not sure. If this is only an issue about the muxer but not the
 demuxer, then say so and I'll open a new ticket.

 FFmpeg only saves the first segment instead of merging all segments
 together, like it's described in this ticket.
 ffmpeg -i url -c copy example.vtt

 Since the m3u8 won't be up forever, here's the content of it:
 {{{
 #EXTM3U
 #EXT-X-VERSION:3
 #EXT-X-TARGETDURATION:300
 #EXT-X-MEDIA-SEQUENCE:1
 #EXT-X-PLAYLIST-TYPE:VOD
 #EXTINF:300.299,
 bobsburgers_cc_505_Digital_IttyBittyDittyCommittee_stream_webvttvtt_00001.vtt
 #EXTINF:300.300,
 bobsburgers_cc_505_Digital_IttyBittyDittyCommittee_stream_webvttvtt_00002.vtt
 #EXTINF:300.300,
 bobsburgers_cc_505_Digital_IttyBittyDittyCommittee_stream_webvttvtt_00003.vtt
 #EXTINF:300.300,
 bobsburgers_cc_505_Digital_IttyBittyDittyCommittee_stream_webvttvtt_00004.vtt
 #EXTINF:104.104,
 bobsburgers_cc_505_Digital_IttyBittyDittyCommittee_stream_webvttvtt_00005.vtt
 #EXT-X-ENDLIST
 }}}

 FFmpeg only saves the first 5mins, so I guess that's the segment time.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4048#comment:5>
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