[FFmpeg-trac] #9609(ffmpeg:new): subtitles: vtt conversion to srt creates an empty output

[FFmpeg]

#9609: subtitles: vtt conversion to srt creates an empty output
-------------------------------------+-------------------------------------
             Reporter:  darodi       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  4.4.1
             Keywords:  subtitles    |               Blocked By:
  convertion srt vtt                 |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 subtitles: vtt conversion to srt creates an empty output

 How to reproduce:
 {{{
 % ffmpeg.exe -i "captions.vtt" "captions.srt"
 ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the
 FFmpeg developers
   built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
   configuration: --enable-gpl --enable-version3 --enable-static --disable-
 w32threads --disable-autodetect --enable-fontconfig --enable-iconv
 --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-
 libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh
 --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca
 --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e
 --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx
 --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi
 --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf
 --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec
 --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-
 libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-
 libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb
 --enable-libmp3lame --enable-libshine --enable-libtheora --enable-
 libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm
 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-
 libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-
 libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9609>
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