Discrepancies in video clips created from MP4 file based on Start second and duration in secs between ffmpeg command in windows and Ubuntu.

[Prem]

Summary of the bug: Discrepancies in video clips created from MP4 file based on Start second and duration in secs between ffmpeg command in windows and Ubuntu. The clip created on windows seems to be accurate but one created on ubuntu has extra secs. (Both uses fast seeking)

How to reproduce:

On windows

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ffmpeg.exe -y -ss 20.0 -i 14c64d99-8315-4b00-af18-0dd80a4b87d8.MP4 -t 20.0 -f MP4 -c:v copy -c:a copy testwin.MP4 => this produces 20 secs clip

On Linux

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ffmpeg -y -ss 20.0 -i 14c64d99-8315-4b00-af18-0dd80a4b87d8.MP4 -t 20.0 -f MP4 -c:v copy -c:a copy testlinux.MP4 => this produces 23 secs clip

ffmpeg windows version

---

ffmpeg version N-103591-geeab62ad2d Copyright (c) 2000-2021 the FFmpeg developers

built with gcc 7.3-win32 (GCC) 20180312
configuration: prefix=./production --cross-prefix=x86_64-w64-mingw32- --target-os=mingw64 --arch=x86_64 --enable-static --enable-libfreetype --enable-libx264 --enable-libopus
libavutil 57. 5.100 / 57. 5.100
libavcodec 59. 7.103 / 59. 7.103
libavformat 59. 5.100 / 59. 5.100
libavdevice 59. 0.101 / 59. 0.101
libavfilter 8. 9.100 / 8. 9.100
libswscale 6. 1.100 / 6. 1.100
libswresample 4. 0.100 / 4. 0.100

ffmpeg linux version

---

ffmpeg version 4.2.7-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
configuration: --prefix=/usr --extra-version=0ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100

[Prem]

sample input file

[Carl Eugen Hoyos]

Two different versions of FFmpeg are not guaranteed to produce identical output.