Ok, so here is how I would do that. `video.add_image` is implemented in
`video.liq`. If you look at the implementation, you see that you could use a
playlist for the image instead of giving the image (and playlists have the
advantage of being reloadable). So I would do something like this
```
s = single("test.avi")
image = playlist("image.pls")
image = mux_audio(audio=blank(), image)
s = add([s,image])
```
which adds the contents of the playlist (`image`) on top of the source `s`.
Here, `image.pls` should contain something like
```
annotate:width=50,height=50,x=10,y=10:test.png
```
which basically means only the image `test.png` (suitably rescaled). Then you
can use the `reload` and `reload_mode` parameters of `playlist` in order to
force reloading regularly or each time the playlist is changed (or touched).
This is not perfect since it would reload depending on time or the playlist
(not the image itself) but I guess this is close to what you need?
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