Add a feature which takes a video clip instead of a screenshot to anki field

[benchi2202]

So basically, a feature like that of subs2srs which takes a videoclip with length based on subtitle's timings and adds it to anki. I tried looking first if memento had a term marker which enables you to send a video clip to an anki note, but surpringly I found none. The closest was {screenshot} and {screenshot-video}, but they were just static images. I looked for alternatives, but all of them either didn't achieve what I was looking for (they were focused on sentence mining instead of just vocabulary) or they were just too much of a hassle to use them. I've managed to modify a mpv2anki lua script to fill in the gap and add it to memento which kinda worked, but I've figure out that it'd be better to just ask the developers of this awesome learning program to implement it.

[ripose-jp]

It's doable but there are a lot of things to think about since video encode is much more expensive than taking screenshots or audio encode. It's possible to speed up encode by just cutting the video and using the same codec as the source, but the trouble comes with rendering that in Anki. A lot of things are encoded with HEVC these days, which is a problem for Anki since Qt Web Engine may not be able to render that codec if it wasn't compiled with support for it. I'll investigate further, but tradeoffs will likely have to be made.