[FFmpeg-trac] #11378(ffmpeg:new): ffmpeg can't detect nested m3u8 for subtitles

[FFmpeg]

#11378: ffmpeg can't detect nested m3u8 for subtitles
--------------------------------+---------------------------------------
             Reporter:  ffvii   |                     Type:  enhancement
               Status:  new     |                 Priority:  wish
            Component:  ffmpeg  |                  Version:  unspecified
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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 When I try to download an m3u8 with ffmpeg, if there's a subtitle track
 that's also an m3u8 uri (which points to the actual vtt uri), ffmpeg shows
 that it can't support the subtitle.

 Here's an example (with masked uri):

 Trying to download with ffmpeg -i
 "https://xxxx.com/api_v2/getm3u8.jsp?resourceId=xxxx", which is an m3u8
 like:

 {{{
 #EXTM3U
 #EXT-X-VERSION:6
 #EXT-X-INDEPENDENT-SEGMENTS
 #EXT-X-MEDIA:TYPE=SUBTITLES,URI="https://xxxx.com:443/api_v2/getm3u8.jsp;jsessionid=null?programGuid=xxxx&bitrate=adaptive&playlist=subtitles_en
 ",GROUP-
 ID="subtitles",LANGUAGE="en",NAME="English",DEFAULT=NO,AUTOSELECT=YES
 #EXT-X-MEDIA:TYPE=AUDIO,URI="https://xxxx.com:443/api_v2/getm3u8.jsp;jsessionid=null?programGuid=xxxx&bitrate=adaptive&playlist=stereo_en
 ",GROUP-
 ID="stereo",LANGUAGE="en",NAME="English",DEFAULT=YES,AUTOSELECT=YES,CHANNELS="2"
 #EXT-X-STREAM-INF:BANDWIDTH=7361028,AVERAGE-
 BANDWIDTH=3305533,CODECS="avc1.4d4029,mp4a.40.2",RESOLUTION=1920x804
 ,FRAME-RATE=23.98,AUDIO="stereo",SUBTITLES="subtitles",CLOSED-
 CAPTIONS=NONE,VIDEO-RANGE=SDR
 https://xxxx.com:443/api_v2/getm3u8.jsp;jsessionid=null?programGuid=xxxx&bitrate=adaptive&playlist=1920x804
 #EXT-X-I-FRAME-STREAM-
 INF:URI="https://xxxx.com:443/api_v2/getm3u8.jsp;jsessionid=null?programGuid=xxxx&bitrate=adaptive&playlist=1920x804_iframe",BANDWIDTH=253475
 ,AVERAGE-BANDWIDTH=70520,CODECS="avc1.4d4029",RESOLUTION=1920x804,VIDEO-
 RANGE=SDR
 }}}
 You can guess by the uri that they will return another m3u8 for each
 track, for example the subtitle uri, the content of
 "https://xxxx.com:443/api_v2/getm3u8.jsp;jsessionid=null?programGuid=xxxx&bitrate=adaptive&playlist=subtitles_en"
 is:

 {{{
 #EXTM3U
 #EXT-X-VERSION:6
 #EXT-X-PLAYLIST-TYPE:VOD
 #EXT-X-TARGETDURATION:6913
 #EXT-X-MEDIA-SEQUENCE:0
 #EXTINF:6913.0,
 https://xxxx.com/apple/00/96/d1/adaptive/text/ENG_xxxx.vtt
 #EXT-X-ENDLIST
 }}}
 The ffmpeg can handle the nested m3u8 for video and audio correctly in
 this case, but not for the subtitle, it show the message:

 {{{
 [hls @ 0000023126e57800] Can't support the subtitle(uri:
 https://xxxx.com:443/api_v2/getm3u8.jsp;jsessionid=null?programGuid=xxxx&bitrate=adaptive&playlist=subtitles_en)
 }}}

 I am not sure if it is a bug report or feature request... 🤔
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11378>
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