I have posted this thread for really no good reason. I just wanted to tell you something funny that I found: the Replay Mod's secret! That's right! Here it is: The files that the Replay Mod creates are compressed A LOT. Open up a .mcpr file with 7-Zip, and look at the size of the actual recording. The recording is literally compressed from 2.1 GB to 10.8 MB: a size 200x smaller than the original.
I had no idea that a file could even be compressed this much!
