avformat/mov: add support for pssh box

* Enable PSSH box writing to mov & moof.
* Enable senc, saio & saiz writing to moof when writing fragments.

Signed-off-by: James Almer <jamrial@gmail.com>
pull/391/head
Malek Assaad 11 months ago committed by James Almer
parent 7b73ea501d
commit 6a108d4759
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