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vp9: Adjust key-frame pars in vpx_temporal_svc_encoder.

Adjust some parameters in sample encoder: vpx_temporal_svc_encoder.
Parameters adjusted to set lower QP for initial key frame,
and allow for larger target size on subsequent key frames.

Change-Id: I092ad968e5b51b9f495dadb6ee96e810663c910e

--- a/examples/vpx_temporal_svc_encoder.c

+++ b/examples/vpx_temporal_svc_encoder.c

@@ -637,7 +637,7 @@

   if (strncmp(encoder->name, "vp9", 3) == 0) cfg.rc_max_quantizer = 52;

   cfg.rc_undershoot_pct = 50;

   cfg.rc_overshoot_pct = 50;

-  cfg.rc_buf_initial_sz = 500;

+  cfg.rc_buf_initial_sz = 800;

   cfg.rc_buf_optimal_sz = 600;

   cfg.rc_buf_sz = 1000;

@@ -746,7 +746,7 @@

   // For generating smaller key frames, use a smaller max_intra_size_pct

   // value, like 100 or 200.

   {

-    const int max_intra_size_pct = 900;

+    const int max_intra_size_pct = 2000;

     vpx_codec_control(&codec, VP8E_SET_MAX_INTRA_BITRATE_PCT,

                       max_intra_size_pct);

   }