bEnableSceneChangeDetect should be true for screen content
Merge pull request #1095 from ruil2/rc_fix_1

bEnableSceneChangeDetect should be true for screen content
use grey instead of green in EC without ref
Merge pull request #1094 from huili2/ec_grey_replace_green

use grey instead of green in EC without ref
Merge branch 'master' of github.com:cisco/openh264 into ReleaseV1.1