[FFmpeg-trac] #6281(undetermined:new): drawtext- limitation on number of drawtext filters used in a single command?

[FFmpeg]

#6281: drawtext- limitation on number of drawtext filters used in a single
command?
-------------------------------------+-------------------------------------
             Reporter:  akhil        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  drawtext     |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by akhil):

 Hi. I have tested with latest ffmpeg version- 3.3.1.
 The problem still exists. It is not able to open more than 512 drawtext
 filters after that ffmpeg writes that it cannot find default "Sans" font.
 PFB complete console output:
 D:\psv\node-ffmpeg-try\frame annotation test>ffmpeg -f concat -i input.txt
 -y -r 10 -filter_complex_script fc.txt -crf 22 -threads 2 -preset
 ultrafast
  output_video.mp4
 ffmpeg version 3.3.1 Copyright (c) 2000-2017 the FFmpeg developers
   built with gcc 6.3.0 (GCC)
   configuration: --enable-gpl --enable-version3 --enable-cuda --enable-
 cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc
 --enable-a
 visynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
 --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b
 --enable
 -libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-
 libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb
 --en
 able-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-
 libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-
 libspe
 ex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-
 libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack
 --enable-
 libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-
 libxvid --enable-libzimg --enable-lzma --enable-zlib
   libavutil      55. 58.100 / 55. 58.100
   libavcodec     57. 89.100 / 57. 89.100
   libavformat    57. 71.100 / 57. 71.100
   libavdevice    57.  6.100 / 57.  6.100
   libavfilter     6. 82.100 /  6. 82.100
   libswscale      4.  6.100 /  4.  6.100
   libswresample   2.  7.100 /  2.  7.100
   libpostproc    54.  5.100 / 54.  5.100
 Input #0, concat, from 'input.txt':
   Duration: 00:00:02.75, start: 0.000000, bitrate: 0 kb/s
     Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown),
 1280x720 [SAR 72:72 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
 Fontconfig error: Cannot load default config file
 [Parsed_drawtext_0 @ 000000000064de80] Cannot find a valid font for the
 family Sans
 [AVFilterGraph @ 00000000006cfec0] Error initializing filter 'drawtext'
 with args 'enable=between(n,0,0):fontsize=40 :fontcolor=black:text=Hello
 John!
 :x=100:y=100-th:shadowcolor=blue:shadowx=1:shadowy=1'
 Error initializing complex filters.
 No such file or directory

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6281#comment:2>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker