Subtitle post-production process implies that all subtitles are recorded to the video media during what is normally referred to as post-production. Subtitle file and video filed are combined together as a single entity, such as DVD, Blu-ray.
The Cavena system supports also this method of operation. Either a standard subtitle transmission system is placed between a player and a recorder or the subtitles are added to the servers such as for the Omneon server where the S-Omneon adds subtitle data off-line.
Subtitle preparation can of course also be seen as post-production, but subtitle preparation is dealt with here.