Live action mixed with stop motion

Hey people,
Sorry if this is the wrong place to post this question but I wasn't sure where else to put it.

I'm wondering what the best compression settings are to export an image sequence to video from quicktime, to best have it match the h.264 video recorded from my 600d?

I'm filming a short film with a 600d and wanting to blend in stop motion sequences. In order to do this and to get it to match I'm trying to match as many settings as I can. The video is full HD h.264. The images for the stop motion start out as jpeg, then I use quicktime to make a video from an image sequence to then take to final cut, but I'm not sure what compression settings to use. I thought h.264 would be the best thing because when importing to final cut, it'll be dealing with the same kinds of videos, as the same kind of compression would be used for the stop motion sequences and the live action sequences (ignoring the fact that the stop motion starts off as jpeg).

h.264 seems to work ok but I'm getting more confused about keyframes, and information on the internet is even more confusing... how do i know what keyframe rate to choose? It's all very confusing. There is a compression setting on quicktime for animation too which of course sounds like a good choice, but really all these options are just really confusing for somebody new to this stuff!
My stop motion sequences will be a mix of 15fps and 24fps, do these differences affect what keyframe rate I enter? Am I even just going about this in a stupid way, and can I simply be dealing with final cut and ignoring quicktime?

Thanks a lot for any help

"best have it match the h.264 video recorded from my 600d?"

Yes. Don't use H.264 use ProRes. There is no point in compressing the video at this stage more than you have to.

Your stop motion sequences should match the frame rate of the camera. That's the important part. The camera most likely shoots 23.976. That's what you should use. Never use 15fps.

Ah thanks so much. is it worth choosing prores (hq) over prores do you think? The other good thing about prores is there are no keyframing options; less to be confused about!

"is it worth choosing prores (hq) over prores do you think?"

No.

awesome thankyou