[FFmpeg-trac] #10169(undetermined:new): VTT subtitles cannot be processed

[FFmpeg]

#10169: VTT subtitles cannot be processed
-------------------------------------+-------------------------------------
             Reporter:  Knyttl       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: VTT subtitles are processed as empty.

 How to reproduce:

 {{{
 ffprobe version 5.1.2 Copyright (c) 2007-2022 the FFmpeg developers
   built with Apple clang version 14.0.0 (clang-1400.0.29.202)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2_1 --enable-shared
 --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-
 ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom
 --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus
 --enable-librav1e --enable-librist --enable-librubberband --enable-
 libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora
 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx
 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype
 --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-
 libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr
 --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
 --enable-videotoolbox
   libavutil      57. 28.100 / 57. 28.100
   libavcodec     59. 37.100 / 59. 37.100
   libavformat    59. 27.100 / 59. 27.100
   libavdevice    59.  7.100 / 59.  7.100
   libavfilter     8. 44.100 /  8. 44.100
   libswscale      6.  7.100 /  6.  7.100
   libswresample   4.  7.100 /  4.  7.100
   libpostproc    56.  6.100 / 56.  6.100
 Input #0, webvtt, from '01.vtt':
   Duration: N/A, bitrate: N/A
   Stream #0:0: Subtitle: webvtt
 }}}

 Any try to render this subtitle file with lead to empty file. I tried to
 convert to SRT with some other tool and then it works fine.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10169>
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