It is cleaner but break the ABI.

A lot of codecs do init it to 0 and fix it later.

It works while paused too.

This will likely fix CID 247, which seems like a false.
I don't see how PIDClean is called twice here, I think it's a limitation in the Coverity scan logic.

I accidently change the probe, not the actual mmap() usage.

That would be Darwin and some BSDs apparently

This means that when the machine gets low on memory, this mmap'ed 4GB movie file is the first to be thrown out of the memory again.

The code was never enabled.

It should fix a potential segfault when the vout is closed.

It helps when reconstructing the video pts as asf does not have them :(