tree 3d3950f6db7b59ce5f87e174587a6c9d52d8662d
parent 4f0dafa1126362362d2b7ff74d334c759bf02cfc
author Marco Paniconi <marpan@google.com> 1684722483 -0700
committer Marco Paniconi <marpan@google.com> 1684783574 +0000

rtc: Reduce thresholds for palette mode in nonrd

For screen content in nonrd_pickmode:
reduce the sse and source_variance thresholds to force
more palette mode testing.

This had good bdrate gains with small increase in
encode time. For speed 10 rtc_screen:
2% bdrate gain in ovr-psnr, ~0.7% IC avg. increase.
Several clips (buganizer, web_browsing) have ~4% bdrate gains.

Also observed reduction in some visual artifacts in
buganizer and web_browsing clips.

Change-Id: I183a5dae1f91c1229ae9217d24d0387c0a71157f