I tried to edit about a 4.2GB-mp4-video, but Blender said "File A could not be loaded." The video length was almost 3 hours. On the other hand, when I tried to load the only first 1 minute of the beginning, Blender succeeded to load it and to display the sequences.
I think Blender may have the upper limit of movie capacity. Can anyone tell me how much capacity Blender accepts?