[FFmpeg-trac] #7972(undetermined:new): Gif output not preserving source duration for last frame

[FFmpeg]

#7972: Gif output not preserving source duration for last frame
-------------------------------------+-------------------------------------
             Reporter:  bjorn        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -i source_lightning.gif out.gif
 ffmpeg version
 ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
 built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared
 --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-
 avresample --cc=clang --host-
 cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include
 -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin'
 --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-
 libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-
 librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora
 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265
 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype
 --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-
 libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex
 --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-
 libaom --enable-libsoxr
 libavutil      56. 22.100 / 56. 22.100
 libavcodec     58. 35.100 / 58. 35.100
 libavformat    58. 20.100 / 58. 20.100
 libavdevice    58.  5.100 / 58.  5.100
 libavfilter     7. 40.101 /  7. 40.101
 libavresample   4.  0.  0 /  4.  0.  0
 libswscale      5.  3.100 /  5.  3.100
 libswresample   3.  3.100 /  3.  3.100
 libpostproc    55.  3.100 / 55.  3.100
 }}}

 out.gif will have the wrong timing for the last frame. you can see this
 visually or in a tool such as imagemagick:

 {{{
 $ identify -format "%T\n" source_lightning.gif
 1
 1
 1
 1
 1
 5
 1
 1
 450
 $ identify -format "%T\n" out.gif
 10
 10
 10
 10
 10
 5
 10
 10
 10
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7972>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker