The source is interlaced. The unpacked format will be interlaced as well with each line containing information from alternating fields. (Since: 1.2)
No flag
When the source has a smaller depth than the target format, set the least significant bits of the target to 0. This is likely slightly faster but less accurate. When this flag is not specified, the most significant bits of the source are duplicated in the least significant bits of the destination.
The different flags that can be used when packing and unpacking.