Quite a large size difference compare to 720p :thinking:

^ 4500 bitrate for 720p vs 15000000 bitrate for 1080p.

The bitrate for the 720p is 1408.7 kbps, while the 1080p is 3715.5 kbps. For 720p, 4500 kb/s is the max bit rate for a single frame, aka the vbv-maxrate, and for 1080p , the vbv-maxrate is 15000 kb/s. It's 1465 seconds long, so if the bitrate for the 720p really was 4500, the video portion would be 804.75 MB, rather than its real size of 252 MB. The real size of the 1080p's video portion is 664.7 MB. The other reason the 1080p is bigger is because it also has the original EAC3 audio track, which adds another 39 MB to the size. From what I understand, the only part originally animated in 1080p was the ending, so you're not losing any detail by watching the 720p (except possibly for the end).

Thanks !