[FFmpeg-trac] #9877(undetermined:new): ffmpeg core dumped error when map webvtt subtitles

[FFmpeg]

#9877: ffmpeg core dumped error when map webvtt subtitles
-------------------------------------+-------------------------------------
             Reporter:  tudge        |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  webvtt       |               Blocked By:
  subtitles                          |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 ffmpeg giving core dumped, segmentation fault error when adding webvtt
 subtitles to mapping on any MKV file or Live stream encoding.
 Without subtitles all working fine.
 Here is the code I use:

 {{{
 ffmpeg \
 -hwaccel cuvid -init_hw_device cuda:1 \
 -v 9 -loglevel debug \
 -report \
 -i "any.mkv" \
 -filter_complex \
 "[0:v]yadif_cuda=0:-1:0,split=4[v1][v2][v3][v4]; \
 [v1]scale_cuda=w=1920:h=1080:interp_algo=lanczos[v1out]; \
 [v2]scale_cuda=w=1280:h=720:interp_algo=lanczos[v2out]; \
 [v3]scale_cuda=w=848:h=480:interp_algo=lanczos[v3out]; \
 [v4]scale_cuda=w=640:h=360:interp_algo=lanczos[v4out]" \
 -map [v1out] -c:v:0 h264_nvenc -b:v:0 5M -maxrate:v:0 6M -minrate:v:0 3M
 -bufsize:v:0 6M -profile:v main -preset p7 \
 -map [v2out] -c:v:1 h264_nvenc -b:v:1 3M -maxrate:v:1 3M -minrate:v:1 1M
 -bufsize:v:1 6M -profile:v main -preset p7 \
 -map [v3out] -c:v:2 h264_nvenc -b:v:2 1M -maxrate:v:2 1M -minrate:v:2 1M
 -bufsize:v:2 2M -profile:v main -preset p7 \
 -map [v4out] -c:v:3 h264_nvenc -b:v:3 500K -maxrate:v:3 500K -minrate:v:3
 300K -bufsize:v:3 1M -profile:v main -preset p7 \
 -map a:0 -c:a:0 aac -b:a:0 128k -ac 2 \
 -map a:1 -c:a:1 aac -b:a:1 128k -ac 2 \
 -c:s webvtt \
 -map s:0 \
 -map s:1 \
 -f hls \
 -hls_playlist_type vod \
 -hls_time 6 \
 -hls_list_size 0 \
 -hls_allow_cache 1 \
 -hls_segment_filename "http://192.168.3.3/any/%v_%05d.ts" \
 -hls_subtitle_path "http://192.168.3.3/any/sub/%v.m3u8"
 -var_stream_map "a:0,agroup:aud,name:RU,language:Русский,default:YES
 a:1,agroup:aud,name:EN,language:English,default:NO
 v:0,name:1080p,agroup:aud,s:0 v:1,name:720p,agroup:aud,s:1
 v:2,name:480p,agroup:aud v:3,name:360p,agroup:aud"
 "http://192.168.3.3/any/%v.m3u8" \
 -master_pl_name master.m3u8
 }}}

 full output with logs in attached file.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9877>
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