Merge pull request #2081 from oioitff/mpeg-fix

More improvement for mpeg pts.
Merge pull request #2082 from oioitff/mpeg-fix

Add ffmpeg logs for MediaEngine in debug mode
Armjit: Implement wsbh and wsbw (rev16 and rev). Fix encoding for rev16.
Stub wsbh/wsbw for x86.
Fix crash for invalid mpeg header.