Merge "MP4: Use track header to get playback duration" into main am: d3dc8adf2c

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3124613

Change-Id: I20056a1ee0f22c55db7997f4e41b4e1740c00f88
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>