tree 25b28c7aa8606782e714b4aaeb630948cb46c92f
parent 438ce17eed9b7ebd5b4cd21c5b81a29e420e242b
author Ray Essick <essick@google.com> 1520546059 -0800
committer Ray Essick <essick@google.com> 1520546460 -0800

heic content_encoding field is optional

comply with the ISO spec that allows for content type fields to
be omitted in the mp4 header if they would be otherwise empty.

Bug: 74375003
Test: before/after of PoC
Change-Id: I522bacf192fee86122f603d6e87506e1a004f3f6