Signed-off-by: Rémi Duraffort <ivoire@videolan.org>

It breaks a bit atmo filter features (ie crop parameters aren't retreive correctly
anymore, at least until the core does set them for video filter2).
But it fixes potential segfaults due to the way the crop-update callback
is (un)registered.

It is a bad idea, but it does not really harm.

They are copies of vout->fmt_*.

atm. you should use --input-fast-seek to get better performance. Basicly
script pretends to get iPhone and asks it trailer-stuff and demuxing
it on appletrailers_iphone.lua-script.

Works for me for most trailers, some don't work, just fix it.

TB.