Merge pull request #1089 from ruil2/rc_fix_1

    add some protection on rc module
Remove warning
Merge pull request #1090 from HaiboZhu/Debug_ExpandBsBuffer

Remove warning
LTR feedback check in decoder
Merge pull request #1093 from huili2/ec_return_error

LTR feedback check in decoder
bEnableSceneChangeDetect should be ture for screen content