In video editing you should consider the following before fixing the price
1. Number of hours needed for editing video based on client requirement - effects, color grading, graphics, animation, transitions
2. time required for audio editing, music, sound effects
3. length of raw footage vs length of the output video in mins
4. software used
5. acceptable number of revisions and delivery time
6. type of video - commercial, videos for social media, product promos
7. additional works if any - thumbnails, different output formats, captions / subtitles, stock clips
check freelance websites for pricing idea go with monthly charges based on video count or if its same kind of videos go for flat pricing per video