This flip default behavior for webrtc users that create packetizers without help of RtpSenderVideo class. Bug: webrtc:42226301 Change-Id: I42fe696039334672b7d0b0ed1f87a52c3f6bf5ca Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/374883 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43807}