 right|thumb|a vision mixer. the term video editing can refer to: the process of manipulating video images. once the province of expensive machines called video editors, video editing software is now available for personal computers and workstations. video editing includes cutting segments (trimming), re-sequencing clips, and adding transitions and other special effects. * linear video editing, using video tape * non-linear editing system (nle), using computers with video editing software * offline editing * online editing * vision mixing, when working within live television and video production environments ==background== video editing is the process of editing segments of motion video production footage, special effects and sound recordings in the post-production process. motion picture film editing is a predecessor to video editing and, in several ways, video editing simulates motion picture film editing, in theory and the use of linear video editing and video editing software on non-linear editing systems (nle). using video, a director can communicate non-fictional and fictional events. the goals of editing is to manipulate these events to bring the communication closer to the original goal or target. it is a visual art. early video tape recorders (vtr) were so expensive, and the quality degradation caused by copying was so great, that 2 inch quadruplex videotape was edited by visualizing the recorded track with ferrofluid and cutting with a razor blade or guillotine cutter and splicing with video tape. the two pieces of tape to be joined were painted with a solution of extremely fine iron filings suspended in carbon tetrachloride, a toxic and carcinogenic compound. this "developed" the magnetic tracks, making them visible when viewed through a microscope so that they could be aligned in a splicer designed for this task. improvements in quality and economy, and the invention of the flying erase-head, allowed new video and audio material to be recorded over the material already recorded on an existing magnetic tape and was introduced into the linear editing technique. if a scene closer to the beginning of the video tape needed to be changed in length, all later scenes would need to be recorded onto the video tape again in sequence. in addition, sources could be played back simultaneously through a vision mixer (video switcher) to create more complex transitions between scenes. thumb|right|editor in linear vcr suite there was a transitional analog period using multiple source [[videocassette re
Film_and_video_technology