tree e33326cbd32dc2e8b82cd7a099af71674dda1238
parent 7d13753307c3242a13e7a8c1bf6650460d280765
author chiyotsai <chiyotsai@google.com> 1594069798 -0700
committer Chi Yo Tsai <chiyotsai@google.com> 1594089965 +0000

Remove unused high level speed features

This CL removes some speed feature flags related to temporal filtering
and overlay coding because their values are constant across all
settings.

These include:
  - disable_overlay_frames
    * overlay encoding is always used as it gives a quality boost with
      almost no speed overhead.
  - adaptive_overlay_encoding
    * adaptive_overlay is always enabled
  - second_alt_ref_filtering
    * second_alt_ref_filtering is always enabled as it gives a large
      quality improvement.

BUG=aomedia:2694

Change-Id: I52759123dfcd7b340c154cecf62e30a64b6081d2