[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        |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  webvtt       |               Blocked By:
  subtitles                          |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Description changed by tudge:

Old description:

> 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.

New description:

 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 \
 -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda \
 -v 9 -loglevel debug \
 -report \
 -fix_sub_duration \
 -i "http://192.168.3.3/any.mkv" \
 -map 0:0 -vf scale_cuda=w=1280:h=720 -c:v:0 h264_nvenc -b:v:0 6M \
 -map 0:0 -vf scale_cuda=w=1280:h=720 -c:v:1 h264_nvenc -b:v:1 3M \
 -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_time 6 \
 -hls_playlist_type event \
 -hls_flags independent_segments \
 -master_pl_name master.m3u8 \
 -hls_segment_type mpegts \
 -hls_segment_filename http://192.168.3.3/any/chunk_%02d%v.ts \
 -var_stream_map "a:0,agroup:aud,name:rus,language:rus,default:YES
 a:1,agroup:aud,name:eng,language:English,default:NO
 v:0,name:1080p,agroup:aud,s:0 v:1,name:720p,agroup:aud,s:1"
 http://192.168.3.3/any/stream_%v.m3u8
 }}}

 full output with logs in attached file.

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Ticket URL: <https://trac.ffmpeg.org/ticket/9877#comment:4>
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