VT: ARTPWriter: Enhanced ARTPWriter as a RTP output am: 65ff0dfad6 am: dabe7858c4

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/952477

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ie782bd6e87e735edb4600d277230e8b7b98800a1