[FFmpeg-trac] #9443(undetermined:new): converting to avi adds an extra frame

FFmpeg trac at avcodec.org
Wed Sep 29 14:24:18 EEST 2021


#9443: converting to avi adds an extra frame
-------------------------------------+-------------------------------------
             Reporter:  Balint       |                     Type:  defect
  Laczko                             |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 Converting to .avi seems to always add an additional frame to the video.

 How to reproduce:
 Let's say I start with a file "startfile.avi" that consists 10 frames.

 1. Convert to mp4:
 {{{
 ffmpeg -y -i startfile.avi -q:v 3 result_round_1.mp4
 }}}
 "result_round_1.mp4" has 10 frames.

 2. Convert back to avi:
 {{{
 ffmpeg -y -i result_round_1.mp4 -c:v mjpeg -q:v 3 -c:a copy
 result_round_1.avi
 }}}
 "result_round_1.avi" has ''11'' frames.

 3. Repeat steps 1 and 2 with the result of a previous loop as an input N
 times.

 4. The final ''.avi'' file will have 10 + N+1 frames.

 FFmpeg version:
 {{{
 ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the
 FFmpeg developers
   built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
   configuration: --enable-gpl --enable-version3 --enable-static --disable-
 w32threads --disable-autodetect --enable-fontconfig --enable-iconv
 --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-
 libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh
 --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca
 --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e
 --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx
 --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi
 --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf
 --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec
 --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-
 libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-
 libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb
 --enable-libmp3lame --enable-libshine --enable-libtheora --enable-
 libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm
 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-
 libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-
 libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
   libavutil      56. 70.100 / 56. 70.100
   libavcodec     58.134.100 / 58.134.100
   libavformat    58. 76.100 / 58. 76.100
   libavdevice    58. 13.100 / 58. 13.100
   libavfilter     7.110.100 /  7.110.100
   libswscale      5.  9.100 /  5.  9.100
   libswresample   3.  9.100 /  3.  9.100
   libpostproc    55.  9.100 / 55.  9.100
 Hyper fast Audio and Video encoder
 }}}

 OS:
 Windows 10, Version 10.0.19042 Build 19042
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9443>
FFmpeg <https://ffmpeg.org>
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