I have composed a video in premiere pro (PP) from many earlier footages also made and exported in PP. However, when I play back the larger composed file the result is stuttering. Also playback before export does stutter.
However, the single footages do not stutter. All of them are 29 fps and 4K.
Type: MPEG Movie File Size: 158,06 MB Image Size: 3840 x 2160 Frame Rate: 29,97 Total Duration: 00:00:17:04 Pixel Aspect Ratio: 1,0 Alpha: None
The composed film is also 29,97 and 4K. Inputs and output are all h264 (adaptive high bitrate). The PC is rather fast.