mp4 resolution

[jw3126]

Is there a way to control the resolution of mp4 output? Here is what I tried:

julia> using Plots

julia> gr(windowsize=(100,100))
Plots.GRBackend()

julia> path = tempname() * ".mp4"
"/tmp/jl_haa4lh.mp4"

julia> anim = @animate for i in 1:100
           plot(randn(10))
       end
Animation("/tmp/jl_FqJLPd", ["000001.png", "000002.png", "000003.png", "000004.png", "000005.png", "000006.png", "000007.png", "000008.png", "000009.png", "000010.png"  …  "000091.png", "000092.png", "000093.png", "000094.png", "000095.png", "000096.png", "000097.png", "000098.png", "000099.png", "000100.png"])

julia> mp4(anim, path)
ERROR: failed process: Process(`/home/jan/.julia/packages/FFMPEG/9JQpZ/deps/usr/bin/ffmpeg -v 0 -framerate 20 -loop 0 -i /tmp/jl_FqJLPd/%06d.png -pix_fmt yuv420p -y /tmp/jl_haa4lh.mp4`, ProcessExited(1)) [1]

OTOH it works with gif:

julia> gif(anim, path * ".gif")
┌ Info: Saved animation to 
└   fn = "/tmp/jl_haa4lh.mp4.gif"
Plots.AnimatedGif("/tmp/jl_haa4lh.mp4.gif")

[grahamas]

I think this may be the same problem I'm running into. I investigated the error and got:

[libx264 @ 0x1a1f980] width not divisible by 2 (799x800)", "Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height", "Conversion failed!"]

However, I'm manually setting the plot size to be 800x800.

[ssfrr]

I just ran into this as well. This is hard to see what's going on because the call to ffmpeg throws a ProcessError but doesn't say what the problem is (it seems that ffmpeg is being run with -v 0 which disables error messages).

In my case I got it to work by setting dpi=101 which for my resolution (500x500) happened to give an even height and width. The return value seems to be of type AnimatedGif but it created the mp4 video.

[hdrake]

This bug is a result of the more fundamental bug discussed in #2303