Merge "MPEG4Writer: Fix unsigned integer overflow" into main am: 97138efc1d am: 8d5d1952ef

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

Change-Id: Ia3d8a797e0af318ded581bcd7a1b260bdfb54bcd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>