Merge "MPEG4Writer: Fix unsigned integer overflow" into main am: 5cb3691cb2

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3137374

Change-Id: Ieed22ca094dcb8c57ecca4c20651724b6d6f9fde
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>