Friday, May 22, 2009

Digital audio & Video editor

A digital audio editor is a computer application for audio editing, i.e. manipulating digital audio. Digital audio editors are the main software component of a digital audio workstation.Editors designed for use with music typically allow the user to do the followingRecord audio from one or more inputs and store recordings in the computer's memory as digital audioEdit the start time, stop time, and duration of any sound on the audio timelineFade into or out of a clip (e.g. an S-fade out during applause after a performance), or between clips (e.g. crossfading between takes)Mix multiple sound sources/tracks, combine them at various volume levels and pan from channel to channel to one or more output tracks.

Apply simple or advanced effects or filters, including compression, expansion, flanging, reverb, audio noise reduction and equalization to change the audioPlayback sound (often after being mixed) that can be sent to one or more outputs, such as speakers, additional processors, or a recording mediumConversion between different audio file formats, or between different sound quality levelsTypically these tasks can be performed in a manner that is both non-linear and non-destructive.

Video editing is the process of re-arranging or modifying segments of video to form another piece of video. The goals of video editing are the same as in film editing — the removal of unwanted footage,or parts of video, the isolation of desired footage, and the arrangement of footage in time to synthesize a new piece of footage.Early video recorders were very expensive, and the quality degradation caused by copying was so great, 2 inch Quadruplex videotape was edited by visualizing the recorded track with ferrofluid, cutting with a razor blade or guillotine cutter and splicing with tape.

Improvements in quality and economy, and the invention of the flying erase head, allowed new video to be inserted cleanly into an existing tape. This technique was referred to as linear editing. If an early scene needed to be lengthened, all the later scenes would need to be added again. Multiple sources could be played back simultaneously through a vision mixer to be mixed or keyed.Modern non-linear editing systems are computer-based, though there was a transitional analog period using multiple source VCRs or LaserDisc players. Footage is played and captured on a hard drive. Content is ingested and recorded natively in the approriate codec which will be used by software such as Avid's Media Composer and Xpress Pro, Apple's Final Cut Pro, and Adobe's Premiere to manipulate the captured footage. High definition video is becoming more popular and can be readily edited using the same software along with related motion graphics programs. Clips are arranged on a timeline, music tracks and titles are added, effects can be created, and the finished program is "rendered" into a finished video. The video may then be distributed in a variety of ways including DVD, web streaming, Quicktime Movies, iPod, CD-ROM, or videotape.

No comments:

Post a Comment