[Bug 785967] videoenc/dec : delay input buffers allocation until first buffer is received

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785967

--- Comment #5 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 357154
  --> https://bugzilla.gnome.org/attachment.cgi?id=357154&action=edit
omxvideodec/enc: delay allocation after the allocation query

Allocating OMX components buffers in set_format() is too early.
Doing it when receiving the first buffers will allow the element to use
the information from the allocation query and/or the first incoming
buffer to pick to best allocation mode.

Tested on raspberry pi with dynamic resolution changes on decoder and
encoder input.

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