Resize mode improvements
Resize mode improvements

Resize and aggressive modes now work on the vast majority of videos,
and no longer require special handling--although merging resized videos
requires the additional step of copying their contents to temporary ts
containers, this will only be performed on streams that actually contain
resized video segments. This is done by creating two different file lists,
one with a .concat extension for "normal" concat using the concat filter,
and one with a .proto extension using the concat protocol and requiring
temporary remuxing to ts.

wlerin/showroom