[FFmpeg-trac] #10341(avcodec:new): [Caption] FFmpeg fails to decode closed-caption to srt/webvtt

[FFmpeg]

#10341: [Caption] FFmpeg fails to decode closed-caption to srt/webvtt
-------------------------------------+-------------------------------------
             Reporter:  Zied Aouina  |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:  avcodec      |                  Version:  git-
             Keywords:  CLosed-      |  master
  caption, eia-608, sub-rip          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: All Windows FFmpeg versions after 4.2.3 fail to
 extract the Closed-caption eia-608 and convert it to srt or webvtt. It's
 stuck without generating any output.
 How to reproduce:
 {{{
 % ffmpeg.exe -f lavfi -i movie=flvdecoder_input223.flv[out+subcc] -y  -map
 0:1  ./output_p.srt
 ffmpeg version N-102809-gde8e6e67e7-20210630 Copyright (c) 2000-2021 the
 FFmpeg developers
   built with gcc 10-win32 (GCC) 20210408
   configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static
 --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64
 --target-os=mingw32 --enable-version3 --disable-debug --disable-w32threads
 --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-
 libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-
 fontconfig --enable-libvorbis --enable-opencl --enable-libvmaf --enable-
 vulkan --enable-amf --enable-libaom --disable-avisynth --enable-libdav1d
 --disable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-
 llvm --enable-libglslang --enable-libgme --enable-libass --enable-
 libbluray --enable-libmp3lame --enable-libopus --enable-libtheora
 --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable-
 libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-librav1e --disable-librubberband --enable-schannel --enable-sdl2
 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame
 --enable-libuavs3d --disable-libvidstab --disable-libx264 --disable-
 libx265 --disable-libxavs2 --disable-libxvid --enable-libzimg --extra-
 cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread
 --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20210630
   libavutil      57.  0.100 / 57.  0.100
   libavcodec     59.  3.100 / 59.  3.100
   libavformat    59.  3.101 / 59.  3.101
   libavdevice    59.  0.100 / 59.  0.100
   libavfilter     8.  0.103 /  8.  0.103
   libswscale      6.  0.100 /  6.  0.100
   libswresample   4.  0.100 /  4.  0.100
 [flv @ 0000022bbf6bbb40] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, lavfi, from 'movie=flvdecoder_input223.flv[out+subcc]':
   Duration: N/A, start: 0.000367, bitrate: N/A
   Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1280x720 [SAR
 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 1k tbn
   Stream #0:1: Subtitle: eia_608
 Output #0, srt, to './output_p.srt':
   Metadata:
     encoder         : Lavf59.3.101
   Stream #0:0: Subtitle: subrip
     Metadata:
       encoder         : Lavc59.3.100 srt
 Stream mapping:
   Stream #0:1 -> #0:0 (eia_608 (cc_dec) -> subrip (srt))
 Press [q] to stop, [?] for help
 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x

 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10341>
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