Merge "MPEG4Writer: Fix unsigned integer overflow" into main am: 97138efc1d

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3236960

Change-Id: I5ab6c771aebe9b4f2ccb737564047ad805082277
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>