Reading image from stream

[yakir12]

I'm having a hard time figuring out how to read an image from a stream:

using FFMPEG_jll, ImageIO
x = ffmpeg() do exe
    open(`$exe -loglevel 8 -ss 0 -i file.mov -vframes 1 -f image2pipe -`)
end
ImageIO.load(x)

I'm getting

ERROR: MethodError: no method matching lock

but not sure if it's because I'm using the wrong syntax?

[IanButterworth]

Can you share the full stack trace, and the versions of ImageIO and PNGFiles

[yakir12]

Yes, of course, sorry:

julia> ImageIO.load(x)
ERROR: MethodError: no method matching lock(::PNGFiles.var"#4#5"{Nothing,Bool,Base.Process,Ptr{Nothing},Ptr{Nothing}}, ::Base.Process)
Closest candidates are:
  lock(::Any, ::Base.GenericCondition) at condition.jl:78
  lock(::Any, ::Base.AbstractLock) at lock.jl:158
  lock(::Any, ::WeakKeyDict) at weakkeydict.jl:76
Stacktrace:
 [1] maybe_lock(::Function, ::Base.Process) at /home/yakir/.julia/packages/PNGFiles/Sgsmw/src/io.jl:33
 [2] load(::Base.Process; gamma::Nothing, expand_paletted::Bool) at /home/yakir/.julia/packages/PNGFiles/Sgsmw/src/io.jl:44
 [3] load(::Base.Process) at /home/yakir/.julia/packages/PNGFiles/Sgsmw/src/io.jl:38
 [4] #invokelatest#1 at ./essentials.jl:710 [inlined]
 [5] invokelatest(::Any, ::Any) at ./essentials.jl:709
 [6] load(::Base.Process; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /home/yakir/.julia/packages/ImageIO/DOpZl/src/ImageIO.jl:27
 [7] load(::Base.Process) at /home/yakir/.julia/packages/ImageIO/DOpZl/src/ImageIO.jl:23
 [8] top-level scope at REPL[8]:1
 [9] run_repl(::REPL.AbstractREPL, ::Any) at /build/julia/src/julia-1.5.0/usr/share/julia/stdlib/v1.5/REPL/src/REPL.jl:288

[IanButterworth]

@SimonDanisch sorry to bother you again with this, but JuliaIO/PNGFiles.jl#19 didn't quite fix it.
I haven't got my head around these stream setups yet, so don't see a fix without spending more time on it.

Perhaps we just need to not lock on those anonymous functions.. but I don't see how we could set up the method signatures to avoid that