Refine libmix video encode to fix screen record messy issue.

BZ: 188859

Change GFX buffer info usage logic.
Refine 64bits variable type.

Change-Id: I55e50e49c0323d6fb91fc48a48314a326d7ca3b5
Signed-off-by: bolunliu <bolun.liu@intel.com>
4 files changed