Why would FFmpeg create these artifacts like remaining pixels on the edges of the animation where objects have already removed and how to remove these?
Why would it create this magenta/red colored borders and how to remove these?
Why does it choose magenta/red color for semi-transparent pixels?
This is the command:
ffmpeg -pattern_type sequence \
-i "project_1_%05d.png" \
-vf "fps=30,scale=-1:-1:flags=lanczos,palettegen" \
"pallete_1.png" \
&& \
ffmpeg -pattern_type sequence \
-i "project_1_%05d.png" -i "pallete_1.png" \
-filter_complex "fps=30,scale=-1:-1:flags=bicubic[x];[x][1:v]paletteuse" \
"animation_bicubic_1.gif"
FFmpeg version:
ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.3.1 (GCC) 20200523
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-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
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
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
The first PNG frame of a sequence I created:
The result(palette) from the first command:
The result(animation) from the second command which previews 2 issues:
As requested in the comment section by Tetsujin, appended more variants with different effects:
The first PNG frame of a version without the glow effect:
A version without the glow effect in a PNG sequence(only artifacts exist):
A version without the transparency in the PNG sequence(no issues):
Indeed, it seems the transparency processing adds artifacts and magenta/red borders to the result.
