[FFmpeg-trac] #9581(undetermined:new): failing to convert ass to srt subs

FFmpeg trac at avcodec.org
Wed Jan 5 16:03:48 EET 2022


#9581: failing to convert ass to srt subs
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  username0422                       |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: Converting ass to srt subs produces an empty output.
 How to reproduce:
 {{{
 % ffmpeg -i input.ass output.srt
 ffmpeg 4.4.1 OR ffmpeg version 4.2.4
 built on 20211217
 }}}


 ffmpeg version N-59934-g68457c1e85-static
 https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2021 the FFmpeg
 developers
   built with gcc 8 (Debian 8.3.0-6)
   configuration: --enable-gpl --enable-version3 --enable-static --disable-
 debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio
 --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp
 --enable-libgme --enable-gray --enable-libaom --enable-libfribidi
 --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt
 --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab
 --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264
 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid
 --enable-libzvbi --enable-libzimg
   libavutil      57. 11.100 / 57. 11.100
   libavcodec     59. 14.100 / 59. 14.100
   libavformat    59. 10.100 / 59. 10.100
   libavdevice    59.  0.101 / 59.  0.101
   libavfilter     8. 20.100 /  8. 20.100
   libswscale      6.  1.101 /  6.  1.101
   libswresample   4.  0.100 /  4.  0.100
   libpostproc    56.  0.100 / 56.  0.100
 Splitting the commandline.
 Reading option '-v' ... matched as option 'v' (set logging level) with
 argument 'debug'.
 Reading option '-i' ... matched as input url with argument 'input.ass'.
 Reading option 'output.srt' ... matched as output url.
 Finished splitting the commandline.
 Parsing a group of options: global .
 Applying option v (set logging level) with argument debug.
 Successfully parsed a group of options.
 Parsing a group of options: input url input.ass.
 Successfully parsed a group of options.
 Opening an input file: input.ass.
 [NULL @ 0x7094c00] Opening 'input.ass' for reading
 [file @ 0x7095400] Setting default whitelist 'file,crypto,data'
 [ass @ 0x7094c00] Format ass probed with size=2048 and score=100
 [ass @ 0x7094c00] Before avformat_find_stream_info() pos: 94758 bytes
 read:94758 seeks:0 nb_streams:1
 [ass @ 0x7094c00] All info found
 [ass @ 0x7094c00] After avformat_find_stream_info() pos: 94758 bytes
 read:94758 seeks:0 frames:0
 Input #0, ass, from 'input.ass':
   Duration: N/A, bitrate: N/A
   Stream #0:0, 0, 1/100: Subtitle: ass
 Successfully opened the file.
 Parsing a group of options: output url output.srt.
 Successfully parsed a group of options.
 Opening an output file: output.srt.
 File 'output.srt' already exists. Overwrite? [y/N] y
 [file @ 0x709aa00] Setting default whitelist 'file,crypto,data'
 Successfully opened the file.
 Output #0, srt, to 'output.srt':
   Metadata:
     encoder         : Lavf59.10.100
   Stream #0:0, 0, 1/1000: Subtitle: subrip
     Metadata:
       encoder         : Lavc59.14.100 srt
 Stream mapping:
   Stream #0:0 -> #0:0 (ass (ssa) -> subrip (srt))
 Press [q] to stop, [?] for help
 cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless
 if it occurs once at the start per stream)
 No more output streams to write to, finishing.peed=   0x
 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
 video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 Input file #0 (input.ass):
   Input stream #0:0 (subtitle): 0 packets read (0 bytes); 0 frames
 decoded;
   Total: 0 packets (0 bytes) demuxed
 Output file #0 (output.srt):
   Output stream #0:0 (subtitle): 0 frames encoded; 0 packets muxed (0
 bytes);
   Total: 0 packets (0 bytes) muxed
 Output file is empty, nothing was encoded (check -ss / -t / -frames
 parameters if used)
 [AVIOContext @ 0x7096900] Statistics: 0 bytes written, 0 seeks, 0
 writeouts
 0 frames successfully decoded, 0 decoding errors
 [AVIOContext @ 0x709d7c0] Statistics: 94758 bytes read, 0 seeks
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9581>
FFmpeg <https://ffmpeg.org>
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