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Use ffmpeg & palette to create gifs, closes #1050

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First let ffmpeg generate a colorpalette so it uses the limited amount
of colors available properly and only then create the actual gif using
the generated palette. This replaces convert completely as it yields far
worse results for long gifs and is considerably slower.
This commit is contained in:
HMH 2017-10-16 23:53:00 +02:00
parent 7f9d83c088
commit 7f7b543e18
1 changed files with 4 additions and 24 deletions
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28
src/animation.jl
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@ -64,35 +64,15 @@ gif(anim::Animation, fn = giffn(); kw...) = buildanimation(anim.dir, fn; kw...)
mov(anim::Animation, fn = movfn(); kw...) = buildanimation(anim.dir, fn; kw...)
mp4(anim::Animation, fn = mp4fn(); kw...) = buildanimation(anim.dir, fn; kw...)
const _imagemagick_initialized = Ref(false)
function buildanimation(animdir::AbstractString, fn::AbstractString;
fps::Integer = 20, loop::Integer = 0)
fn = abspath(fn)
try
if !_imagemagick_initialized[]
file = joinpath(Pkg.dir("ImageMagick"), "deps","deps.jl")
if isfile(file) && !haskey(ENV, "MAGICK_CONFIGURE_PATH")
include(file)
end
_imagemagick_initialized[] = true
end
# prefix = get(ENV, "MAGICK_CONFIGURE_PATH", "")
# high quality
speed = round(Int, 100 / fps)
run(`convert -delay $speed -loop $loop $(joinpath(animdir, "*.png")) -alpha off $fn`)
catch err
warn("""Tried to create gif using convert (ImageMagick), but got error: $err
ImageMagick can be installed by executing `Pkg.add("ImageMagick")`.
You may also need to install the imagemagick c++ library through your operating system.
Will try ffmpeg, but it's lower quality...)""")
# low quality
run(`ffmpeg -v 0 -framerate $fps -loop $loop -i $(animdir)/%06d.png -y $fn`)
# run(`ffmpeg -v warning -i "fps=$fps,scale=320:-1:flags=lanczos"`)
end
# generate a colorpalette first so ffmpeg does not have to guess it
run(`ffmpeg -v 0 -i $(animdir)/%06d.png -vf palettegen -y palette.png`)
# then apply the palette to get better results
run(`ffmpeg -v 0 -framerate $fps -loop $loop -i $(animdir)/%06d.png -i palette.png -lavfi paletteuse -y $fn`)
info("Saved animation to ", fn)
AnimatedGif(fn)