On 3 Oct 2013, at 21:26, Paul Weaver <paul.wea...@bbc.co.uk> wrote:

> How can I capture STDERR?

You're looking for IPC::Open3, I suspect. Certainly it's the closest analogue 
to the way you're doing it that I can think of.

http://perldoc.perl.org/IPC/Open3.html

I also note that ffmpeg is a strange beast and has a fairly undocumented remote 
control mechanism. At least I think that was ffmpeg. That only requires 
STDIN/STDOUT.

James

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