named pipes

#1
hi; I've got a setup where I need ffmpeg consumer to dump to a windows named pipe

this would normally work with an ffmpeg command line :

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ffmpeg.exe -re -i <inputvideofile.mp4> -vf format=yuv420p,scale=-2:288 -c:v libvpx -quality realtime -b:v 300k -c:a libvorbis -b:a 64k -ar 44100 -g 1 -keyint_min 1 -f webm \\\\?\\pipe\\myffpipe
but I can't get this to work under CasparCG

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ADD 1-1 STREAM \\\\?\\pipe\\myffpipe -vf format=yuv420p,scale=-2:288 -c:v libvpx -quality realtime -b:v 300k -c:a libvorbis -b:a 64k -ar 44100 -g 1 -keyint_min 1 -f webm
in the log I have some boost filesystem error:

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Dynamic exception type: class boost::filesystem::filesystem_error
std::exception::what: boost::filesystem::remove: The parameter is incorrect: "\\?\pipe\ccgpreview"
am I doing anything wrong ?

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