int64( 0x8000000000000000 ) -> reinterpret(Int64, 0x8000000000000000)

* required for v0.4 compatibility
Merge pull request #46 from kmsquire/AV_NOPTS_VALUE

int64( 0x8000000000000000 ) -> reinterpret(Int64, 0x8000000000000000)