mov: Support default-base-is-moof.

default-base-is-moof shall be set to track fragments compatible with DASH
Media Segments. So, this is a fundamental support for ISOBMFF ver. DASH.
This is meaningful only when base-data-offset-present is absent and two or
more track fragments are present in a movie fragment.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit '20f95f21f9b9595608ba668a6eca78f2d508be67'

* commit '20f95f21f9b9595608ba668a6eca78f2d508be67':
  mov: Support default-base-is-moof.

Merged-by: Michael Niedermayer <michaelni@gmx.at>
x86/swr: convert resample_{common, linear}_double_sse2 to yasm

Signed-off-by: James Almer <jamrial@gmail.com>

312531 -> 311528 dezicycles

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>