Memory.copy

gst.memory.Memory copy(ptrdiff_t offset, ptrdiff_t size)

Return a copy of size bytes from mem starting from offset. This copy is guaranteed to be writable. size can be set to -1 to return a copy from offset to the end of the memory region.

Parameters

`offset`	offset to copy from
`size`	size to copy, or -1 to copy to the end of the memory region

Returns

a new copy of mem if the copy succeeded, null otherwise.