Questions about a Jitter video looper

Hi all!

I'm working on a beginner level media project using Jitter. Basically, I'm trying to build a simple video looper that takes video input, writes it to disk, reads it back into the patch, and then loops it. From there, I plan to build on it with various types of user interactions that modulate the loop and the video (I've built one in so far with the rslider controlling the looppoints). It's roughly working so far, but I'm having three issues that I can't wrap my head around and was wondering if anyone had any insight into:

1. For some reason the video playback seems to always happen at double speed--can't figure out why this is.

2. At the higher range of the looppoints-modulating rslider (maybe 80% above or so on the slider) the loop stops working and the video just freezes until I choose a lower set of points on the slider.

3. I'd like to have the user be able to change the write-location of the jit.record object using a file browser (similar to how the "replace" message works with a buffer~ object) but can't figure out how to do this, if it's possible.

Again, I'm super early on in my learning here so any help is much appreciated. Additionally, if anyone has notes on the patch in general those would be much appreciated too!

Thanks in advance,
Rick