Flow Plugins Checks for Subtitles

[jacroe]

I'm really digging the new Flow system. At first I was like "Why would I care about this when my plugin stack does everything I need?" and then I saw the potential with logic checks and suddenly understood. Wonderful so far.

I noticed a the Check plugins and see their potential with video and audio. Could similar checks be added for subtitles? The two I can think of are "Does this file have subtitles?" and "Does it have subtitles of a particular type(s)?" In my particular case, I would want to detect if my video files have WebVTT subtitles and convert them to SRTs. I can have a ffmpeg set of steps that do that conversion for every file it processes, but it would be unnecessary if I could check for their existence first.