[FFmpeg-trac] #11502(avformat:new): HLS var_stream_map for vtt

[FFmpeg]

#11502: HLS var_stream_map for vtt
-------------------------------------+-------------------------------------
             Reporter:  mars         |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:
                                     |  unspecified
             Keywords:  HLS webvtt   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Hello, I'm trying to find a solution to create a master playlist for hls.
 If I run the command from the documentation


 `````````````````````````````````````````````````````````````````````````````````````````````````````````````````
 ffmpeg -y -i input_with_subtitle.mkv \
  -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
  -b:a:0 256k \
  -c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0 \
  -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle,sname:English" \
  -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4
 -hls_list_size \
  10 -master_pl_publish_rate 10 -hls_flags \
 delete_segments+discont_start+split_by_time ./tmp/video.m3u8
 `````````````````````````````````````````````````````````````````````````````````````````````````````````````````

 it works correctly. But when I try to do the same using api


 `````````````````````````````````````````````````````````````````````````````````````````````````````````````````
 av_opt_set_int(ofmt_ctx, "hls_list_size", 6, AV_OPT_SEARCH_CHILDREN);
 av_opt_set(ofmt_ctx, "hls_flags",
 "omit_endlist+append_list+delete_segments", AV_OPT_SEARCH_CHILDREN);
 av_opt_set_int(ofmt_ctx, "hls_time", 5, AV_OPT_SEARCH_CHILDREN);
 av_opt_set(ofmt_ctx, "master_pl_name", "hls.m3u8",
 AV_OPT_SEARCH_CHILDREN);
 av_opt_set(ofmt_ctx, "fix_sub_duration", "1", AV_OPT_SEARCH_CHILDREN);
 av_opt_set(ofmt_ctx, "var_stream_map", "v:0,a:0,s:0,sgroup:subs",
 AV_OPT_SEARCH_CHILDREN);
 `````````````````````````````````````````````````````````````````````````````````````````````````````````````````

 And I set the sgroup:subs options so that the #EXT-X-MEDIA:TYPE=SUBTITLES
 tag is generated in the manifest file, then an error occurs

 [hls @ 0x55c4c4b3e580] Invalid keyval sgroup:subtitle
 [hls @ 0x55c4c4b3e580] Variant stream info update failed with status
 ffffffea

 Please tell me how to correctly pass var_stream_map to ofmt_ctx so that
 the manifest is created correctly
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Ticket URL: <https://trac.ffmpeg.org/ticket/11502>
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