message: Av1 wrapper: only use speed 6 on cores > 2
  Cr-Commit-Position: refs/heads/master@{#31436}
diff: @@ -50,10 +50,10 @@ constexpr float kMinimumFrameRate = 1.0;
  // Only positive speeds, range for real-time coding currently is: 6 - 8.
  // Lower means slower/better quality, higher means fastest/lower quality.
  -int GetCpuSpeed(int width, int height) {
  +int GetCpuSpeed(int width, int height, int number_of_cores) {
  // For smaller resolutions, use lower speed setting (get some coding gain at
  // the cost of increased encoding complexity).
  - if (width * height <= 320 * 180)
  + if (number_of_cores > 2 && width * height <= 320 * 180)
  return 6;
  else if (width * height >= 1280 * 720)
  return 8;
  @@ -214,8 +214,9 @@ int LibaomAv1Encoder::InitEncode(const VideoCodec* codec_settings,
  inited_ = true;
  // Set control parameters
  - ret = aom_codec_control(&ctx_, AOME_SET_CPUUSED,
  - GetCpuSpeed(cfg_.g_w, cfg_.g_h));
  + ret = aom_codec_control(
  + &ctx_, AOME_SET_CPUUSED,
  + GetCpuSpeed(cfg_.g_w, cfg_.g_h, settings.number_of_cores));
  if (ret != AOM_CODEC_OK) {
  RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
  << " on control AV1E_SET_CPUUSED.";
  