This removes call of av_register_all(), which is deprecated, and related code. Bug: webrtc:9352 Change-Id: Ib7de5931c900eaf1023ecf3046f560feaaeec8ef Reviewed-on: https://webrtc-review.googlesource.com/85347 Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23743}