Syncing fixed video and audio to MSP metronome cues (syncing video with cues triggered by qlist)

First, the specific question: I want to sync a fixed video plus audio (jit.movie~) to metronome cues launched based on file position in milliseconds. I thought that time_secs would be my best bet to accomplish this, but I cannot figure out how to use seeknotify. I keep reading that avf requires seeknotify, but it doesn't seem to mention what to do in viddll (I'm a Windows user). What would be the best way to extract the extract the file position in ms? (in MSP terms, I'm trying to get the equivalent of the file position released by sfplay~)

Context: I wrote a patch to give visual blinking cues to a performer to sync with fixed media. I got it to work perfectly with audio alone using the File Position data from sfplay~ and a qlist. I convert the file position into seconds and remaining milliseconds and use the qlist to trigger the metronomes when the file position reaches the desired point. Now, I have finished (fixed) videos that go along with the fixed media audio. The loading time of the video makes it completely unpredictable for when the audio should be cued, or else I'd just keep the sfplay~ active with a soundless video. So, I'd like to pull out the File Position in milliseconds from the video (jit.movie~) in a similar way to what I was doing in sfplay~ (and I have been lost in the forum and tutorial for days figuring this out).

Thanks in advance!