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Show us what you have and maybe you'll save someone else some time too.
I am saving a video file of known length , in seconds.
There are potentially two buffers in play depending on how the drive is mounted. Going from very fuzzy memory.) First of all, you need to find out which function is taking more time.
I say might because I've never done AIO on Linux, only on Windows. Can't tell about the OS unless I know how the drive is mounted (O_SYNCW or something like that.
The purpose is to avoid inefficient use of system calls (actually reading or writing a single character to a disk file, "right now").