L&T does in fact work with those cameras.
I outlined the details earlier in the thread, but I discovered the trick to making L&T work with my North American t4i was updating my E1 plugin and modifying the plist file like this:
Open your cameras.plist file, copy and paste the entire 5DMark III section, and replace the first string’s “5DMarkIII” with “X6i” and replace the second string that reads “Canon EOS 5D Mark III” with “Canon EOS Kiss X6i” and Log and Captuire will work.
I think people have verified the other poster’s method worked for them too, but for MY t4i using “t4i” didn’t work, I had to call it the “X6i” as stated.
If your T3i isn’t working with the other poster’s method, open up the metadata on a still photo file you took with it (in lightroom or something similar) and see what your camera is called to be certain, then modify the plist file to match and it will work.
(Using mpeg streamclip is a really clunky way to do it, and even clunkier if you’re conforming footage with cinema tools.)