In an effort to improve VideoIO.jl, we are trying to capture both STDOUT and STDERR output of a call to an external binary from the Julia REPL. I tried a few suggestions based on previous discussions (JuliaLang/julia#3823 <https://github.com/JuliaLang/julia/issues/3823>, Capture the output of Julia's console <https://groups.google.com/forum/#!topic/julia-users/3wGChHHYoxo>) on how to this but none of them worked from the Julia REPL in this case.
I can direct both STDOUT and STDERR output to a .txt file when calling the following from the bash terminal: $ julia -e 'open(`/usr/local/Cellar/ffmpeg/2.4.2/bin/ffmpeg -list_devices true -f avfoundation -i \" \"`)' 1> stdout.txt 2> stderr.txt However, when using the equivalent call from inside the julia REPL: f=open(`/usr/local/Cellar/ffmpeg/2.4.2/bin/ffmpeg -list_devices true -f avfoundation -i \" \"`, "r", STDERR)readall(f) ERROR: `readall` has no method matching readall(::(Pipe,Process)) I know there is a way to capture all the output but it requires exiting the Julia REPL. Does anyone know a relatively straightforward way to capture STDOUT and STDERR from Julia -- without exiting the Julia REPL?
