#11081: Mov to MP4 produces weird artifacts if mov has an alpha channel
(transparency)
-------------------------------------+-------------------------------------
Reporter: Nommalorel | Type: art
Status: new | Priority: normal
Component: | Version: 7.0
undetermined |
Keywords: art , | Blocked By:
animation , render , conversion , |
movtomp4 , transparent , artifact |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
When i try to convert my animation .mov file that i rendered from spine2d
that has a transparent background to an .mp4 file ffmpeg creates weird
artifacts on and around the character.
First frame that is converted by adobe media encoder:
https://i.ibb.co/mTyZ3W5/adb-md-enc-f1.png
First frame that is converted by ffmpeg (or any FOSS converter that uses
ffmpeg as a base) : https://i.ibb.co/hR4PmVz/ffmpeg-f1.png
How to reproduce:
{{{
Render a mov file from any animation or video editing program with a video
that has an object or a character at the middle but has a transparent
background. Then convert with the code stated below.
% ffmpeg -i {inname}.mov {outname}.mp4
ffmpeg version
ffmpeg version 7.0.1-full_build-www.gyan.dev Copyright (c) 2000-2024 the
FFmpeg developers
built with gcc 13.2.0 (Rev5, 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-bzlib --enable-lzma
--enable-libsnappy --enable-zlib --enable-librist --enable-libsrt
--enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray
--enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption
--enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libxevd
--enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve
--enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg
--enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r
--enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-
liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-
amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va
--enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec
--enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan
--enable-libplacebo --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-libcodec2 --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 59. 8.100 / 59. 8.100
libavcodec 61. 3.100 / 61. 3.100
libavformat 61. 1.100 / 61. 1.100
libavdevice 61. 1.100 / 61. 1.100
libavfilter 10. 1.100 / 10. 1.100
libswscale 8. 1.100 / 8. 1.100
libswresample 5. 1.100 / 5. 1.100
libpostproc 58. 1.100 / 58. 1.100
built on ...
Windows 10
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11081>
FFmpeg <https://ffmpeg.org>
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