tree 7f78d1f8e4f05dc7ff754e1848c96689f3dcf8f6
parent a1f60445b2e7fa17fc23c3e6832226b4d21df067
author chiyotsai <chiyotsai@google.com> 1565044246 -0700
committer chiyotsai <chiyotsai@google.com> 1565197043 -0700

Change the minimum bsize to 8x8 for 4K+ videos

For 4K resolution and above, going down to BLOCK_8X8 does not offer
coding gain. Disabling it improves coding quality, speeds up the encoder,
and allows reduction of memory usage.

Performance on 4K:
 SPD | AVG_PSNR | OVR_PSNR |  SSIM  |  SPD_UP
 *0  |  -0.050% |  -0.049% |-0.041% |    N/A
  1  |  -0.041% |  -0.046% |-0.037% | +1.560%

*Speed 0 result is only an approximate as full run takes too long to
finish.

BUG=aomedia:2453

STATS_CHANGED

Change-Id: I1ede32f0bb42fd31bfd64119eeff180ca295ebd6