because we'll need fake chunks

for WMV/VC1

and fix write overflows

should be reusable

Timeline was only supposed for live usage

still carried from early impl

Previously, when Close() was called, SPU region were not properly cleared.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Both branches of the conditionals had the same results.

Previously, when SPU id was identical but its region changed, it wasn't correctly redrawn.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>