[FFmpeg-user] disabling scene detection

[Alex Teslik]

Hello,

    I have an image sequence of line drawings where the drawings change 
abruptly. Ffmpeg is resetting the frame numbers that I am burning in using the 
drawtext option every time there is an abrupt change. Here is the command I am 
using, and the output:

ffmpeg.exe -y -r 10 -i final-%d.png -vf 
"drawtext=fontfile='C\:/WINDOWS/fonts/arialbd.ttf':text=%
{frame_num}:start_number=1:fontcolor=black:fontsize=15:x=10:y=10,fps=10" -
pix_fmt rgb24 -c:v qtrle -r 10 test.mov
ffmpeg version git-2020-02-18-ebee808 Copyright (c) 2000-2020 the FFmpeg 
developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --
enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-
libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-
libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-
libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-
libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --
enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis 
--enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid 
--enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-
d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --
enable-libopenmpt --enable-amf
  libavutil      56. 41.100 / 56. 41.100
  libavcodec     58. 70.100 / 58. 70.100
  libavformat    58. 38.101 / 58. 38.101
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 76.100 /  7. 76.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, image2, from 'final-%d.png':
  Duration: 00:00:04.96, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, gray(pc), 240x196 [SAR 7559:7559 DAR 60:49], 25 
fps, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> qtrle (native))
Press [q] to stop, [?] for help
Output #0, mov, to 'test.mov':
  Metadata:
    encoder         : Lavf58.38.101
    Stream #0:0: Video: qtrle (rle  / 0x20656C72), rgb24, 240x196 [SAR 1:1 DAR 
60:49], q=2-31, 200 kb/s, 10 fps, 10240 tbn, 10 tbc
    Metadata:
      encoder         : Lavc58.70.100 qtrle
frame=  124 fps=0.0 q=-0.0 Lsize=     635kB time=00:00:12.30 bitrate= 
422.9kbits/s dup=3 drop=0 speed=92.5x
video:634kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing 
overhead: 0.200005%


The images start at 1 and sequentially increment. But when the image changes 
dramatically, the frame numbering starts over at 1 again. So out of 124 images 
I get 4 sequences burned in:

1-82
1-5
1-25
1-9

How can I turn off the scene detection so that it stops resetting the frame 
counter?

Thanks.