fixing OverallMbMap for slice_idx>255 and some log improvements
fix according to comments
add return value processing
add level 9 supporting
Merge pull request #1534 from syureyi/level9

add level 9 supporting
Merge pull request #1526 from ruil2/max_nal_size

add return value processing
Merge pull request #1536 from sijchen/improve_br_valid

[Encoder] adjust the param validation of max bit rate
using int64 rather than int32 for uiTimestamp to avoid missing of preciseness