I have a 50 MB file, imported it in Hitfilm express and all I did was removed existing audio and added new audio. Didn't touch the video. Exported it by creating a new preset with resolution set as that of source. The original video resolution is 360p, still changed the video quality from higher to lower and the file size was 360 MB!! Why so much increase at reduced settings?
I would also like to know how to edit and export the video in exactly the same settings as source file.