thx jordan, works perfectly =)

cheers, chris

MonkeeSage wrote:
> Hi Chris,
> 
> ffmpeg writes that on stderr rather than stdout, so a simple way to
> capture it is with output redirection (the 2>&1 part means redirect
> stderr to stdout):
> 
> op = ["ffmpeg result/output:".upcase, " "]
> ...
> op << %x{ffmpeg -v 2>&1}
> 
> For a more robust solution to capturing stderr look at popen3 in the
> standard library [1] or the popen4 extension from rubyforge [2].
> 
> Also note that it's somewhat complicated to try to read the output of
> programs like ffmpeg to get the encoding status for realtime display in
> your app. To do that you'll probably have to use threads and a polling
> loop or IO#select among other things. I don't know if that's why you
> want to read the output, but I just thought I'd let you know.
> 
> [1] http://www.ruby-doc.org/stdlib/libdoc/open3/rdoc/index.html
> [2] http://popen4.rubyforge.org/
> 
> Regards,
> Jordan
>