lavinfo returns bad texts to lav2mpeg

Hi!

Second useful bug for today:
http://bugs.gentoo.org/show_bug.cgi?id=137530

This is about lavinfo returning for example this:
video_inter=***BOGUS/UNKNOWN*** interlacing

and lav2mpeg cannot cope with that, it then tries to execute that line and 
errors on not finding executable interlacing (because of whitespace in 
output).

I thought this issue was solved, but having a closer look this needs some work 
I think.

Matthias

-- 
Matthias Schwarzott (zzam)

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