What is linear editing and what does non-linear editing mean

Linear editing (LinearEdiTIng)

Linear editing is the traditional video editing method. The linear editing system is composed of a video player, a video recorder, and an editing controller, or a complex system composed of multiple video recorders, video players, and special effects equipment. Select a suitable piece of material through the player, and then record it on the tape in the VCR, then find the next shot, and then record, and so on, until all the materials are edited and recorded in sequence. Usually to complete the editing of a video, it is necessary to repeatedly replace the video tape to find the required part. The entire production process is very cumbersome, and after repeated editing many times will also reduce the quality of the video.

Traditional linear editing must also sequentially search for the required video images during editing. The traditional linear editing method must be re-edited when inserting pictures that are not equal to the original picture time, or deleting certain segments in the program; and the video quality must be reduced every time it is edited.

Non-linear editing (Non-linearEdiTIng):

Non-linear editing is for linear editing, referred to as non-editing. The non-linear editing system is actually an extended computer system, which consists of a high-performance computer and a set of video and audio input / output cards (that is, non-linear editing cards), coupled with a large-capacity SCSI disk array to form a non-linear Edit the basic hardware of the system. The non-linear editing system directly accesses the material and edits it in the form of frames or files from the hard disk of the computer. It is a special equipment with a computer as a platform, which can realize the functions of a variety of traditional video production equipment. You can change the order of materials at will, shorten or lengthen a section at will, and add various effects. The digital storage method makes file editing, copying and other operations no longer wear out. Using a non-linear editing system, you can use your imagination to the fullest and no longer be bound by a linear editing system.

Non-linear editing has a wide range of applications. With the rapid development of computer technology, non-linear editing technology is constantly updated and improved. It has a great impact on the traditional film and television advertising production operations, from commercial presentations, teaching materials, multimedia readings, product demonstrations, corporate feature films, web animations to large-scale movies and TV series have non-linear editing applications.

Non-linear editing equipment varies greatly depending on the final output object and the application field. A simple non-linear editing system can be composed of an ordinary computer, a video capture card, and non-linear editing software. You can also use the faster SGI workstation, real-time non-editing card and professional-grade non-editing software. The prices of different non-editing systems vary greatly, ranging from several thousand yuan to millions of yuan. Which non-editing system to use depends on the final output object and application field.

Features of nonlinear editing

Non-linear video editing is the editing and processing of digital video files. It is similar to other data files processed by computers. It can be edited and processed repeatedly anytime, anywhere, and many times in the software editing environment of a microcomputer. The non-linear editing system is only the record of editing points and special effects in the actual editing process. Therefore, any editing, modification, copying, and adjustment of the front and rear sequence of the animation will not cause the deterioration of the picture quality, and overcome the weaknesses caused by traditional equipment. The non-linear editing system is miniaturized and has a high degree of functional integration. It can be easily networked with other non-linear editing systems or ordinary personal computers to form network resource sharing.

The professional-level non-linear editing system has high processing speed and low data compression, so the quality of video and audio is high. In addition, the high processing speed also makes professional-level stunt processing functions stronger. With the rapid development of computer hardware and software technology, the price of non-linear editing systems is also declining, and low-end products can already enter the family. These low-end products are actually as we introduced in this chapter, it is a multimedia computer plus a set of video analog-to-digital conversion card, plus a set of editing software such as Premiere can be achieved.

Non-linear editing is an emerging discipline. Since the 1990s, with the development of high-speed processors and digital technologies, the application range of computer graphics and image technology has gradually penetrated into various fields of broadcast and television. Compared with the equipment, it has obvious advantages.

One is real-time when collecting materials. The system uses a real-time video and audio capture and playback card to record the material, which enables the production of editing `stunts` subtitles in real time.

It is more convenient to produce the second post. Program creators can fully integrate image, text, sound, special effects, animation, etc. into the free creation environment, and complete the production in a digital way in one system.

The non-linear editing system is built on the basis of a computer, so it is easy to connect to the network and can share resources.

Non-linear editing is an editing method for video programs. Because it can achieve random access, modification and processing of any part of the original material, it has created a new world that the original tape editing system does not have. It has outstanding advantages, so it has been received by people. In recent years, non-linear editing systems have been greatly developed and widely used. In fact, non-linear editing has long been applied to movie film editing. The film material of the film can be glued together in any order during editing, and the order can be changed, shortened or lengthened. In fact, this is non-linear editing. The meaning of "non-linear" here means that the length and order of the materials can be arranged and edited arbitrarily according to the order and length of production. Because television programs are recorded on a large number of tapes, and tapes are electronically edited, there is no need to cut the tape. Electronic control and copying methods are used to reconnect the shot materials into new continuous images as required. This editing system can be composed of a video player, a video recorder and an editing controller, or it can be a complex system composed of multiple video recorders, video players and special equipment. During production, the material is usually compiled into a new continuous picture in sequence by combination editing, and then a certain length is replaced by insert editing, but it is impossible to remove and shorten a certain length in the middle. This type of editing is called linear editing.

Video non-linear editing equipment has been expanded with the introduction of recordable discs and hard drives. Because the optical disc and hard disk are retrieved by plane, the addressing is fast and accurate. The working head does not touch the disc during recording and playback, and there is no wear and tear, and the image quality of repeated recording and playback will not deteriorate. The huge promotion of non-linear editing also lies in video bit rate compression. The advancement of bit rate compression technology makes it possible to have very high-quality images at low bit rates, so that the capacity of the disc or hard disk is no longer the bottleneck restricting the use. And the rate compression can easily realize the time axis compression and expansion. For non-linear editing of materials stored on optical discs or disks, you only need to set the length of the materials in parallel and compile a program list to complete the editing of all programs.

Common terms for nonlinear editing: layers, channels, masks, keyframes, filters, keying, motion tracking, frames, fields, compression, virtual memory, SMPTE timecode.

Non-linear editing workflow: use IEEE1394 interface and cable to connect with PC for data collection and input, after editing, playback to the camera, burn to CD and output as web page animation, this digital process has greatly improved Work efficiency of nonlinear editing.

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