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datarate_test/ChangingDropFrameThresh: set kf interval

restore the value for VP9 to 9999 to satisfy the current test
expectations; without this
VP9/DatarateTestVP9Large.ChangingDropFrameThresh/8 will overshoot.

Change-Id: I88dad574ae4ab10f923579824c7347ff468c7045

--- a/test/datarate_test.cc

+++ b/test/datarate_test.cc

@@ -519,6 +519,9 @@

   cfg_.rc_end_usage = VPX_CBR;

   cfg_.rc_target_bitrate = 200;

   cfg_.g_lag_in_frames = 0;

+  // TODO(marpan): Investigate datarate target failures with a smaller keyframe

+  // interval (128).

+  cfg_.kf_max_dist = 9999;

   ::libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,

                                        30, 1, 0, 140);

@@ -947,6 +950,7 @@

   svc_params_.scaling_factor_num[2] = 288;

   svc_params_.scaling_factor_den[2] = 288;

   cfg_.rc_dropframe_thresh = 10;

+  cfg_.kf_max_dist = 9999;

   ::libvpx_test::I420VideoSource video("niklas_1280_720_30.y4m", 1280, 720,

                                        30, 1, 0, 300);

   cfg_.rc_target_bitrate = 800;

@@ -984,6 +988,7 @@

   svc_params_.scaling_factor_num[1] = 288;

   svc_params_.scaling_factor_den[1] = 288;

   cfg_.rc_dropframe_thresh = 10;

+  cfg_.kf_max_dist = 9999;

   ::libvpx_test::I420VideoSource video("niklas_1280_720_30.y4m", 1280, 720,

                                        30, 1, 0, 300);

   cfg_.rc_target_bitrate = 800;

@@ -1023,6 +1028,7 @@

   svc_params_.scaling_factor_num[2] = 288;

   svc_params_.scaling_factor_den[2] = 288;

   cfg_.rc_dropframe_thresh = 10;

+  cfg_.kf_max_dist = 9999;

   ::libvpx_test::I420VideoSource video("niklas_1280_720_30.y4m", 1280, 720,

                                        30, 1, 0, 300);

   cfg_.rc_target_bitrate = 800;