Monday, March 28, 2016

Write short notes on AVI and DVI

Audio Video Interleave:
Audio Video Interleaved (also Audio Video Interleave). AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback. the AVI files support multiple streaming audio and video,

Format:

AVI is a derivative of the Resource Interchange File Format (RIFF), which divides a file's data into blocks, or "chunks." Each "chunk" is identified. An AVI file takes the form of a single chunk in a RIFF formatted file

Limitations:

Since its introduction in the early 90s, new computer video techniques have been introduced which the original AVI specification did not anticipate.
AVI does not provide a standardized way to encode information, There are several competing approaches to including a time code in AVI files, although it is widely used.

AVI was not intended to contain video using any compression technique. Approaches exist to support modern video compression techniques (such as MPEG-4)

AVI cannot contain some specific types of (VBR) data reliably AVI files at the resolutions and frame rates normally used to encode standard definition feature films is about 5 MB per hour of video.


Digital Video Interactive:

Digital Video Interactive (DVI) was the first multimedia desktop video standard for IBM-compatible personal computers. It enabled full-screen, full motion video, and graphics to be presented on a DOS-based desktop computer. The scope of Digital Video Interactive encompasses a file format.

Implementations:

The first implementation of DVI developed in the mid-80s relied on three 16-bit ISA cards installed inside the computer, one for audio processing, another for video.

Later DVI implementations only used one card, such as Intel's ActionMedia series Compression.

The DVI format specified two video compression schemes, Presentation Level Video or Production Level Video (PLV) and Real-Time Video (RTV) and two audio compression schemes, ADPCM and PCM8.[3][1].

The original video compression scheme, called Presentation Level Video (PLV), was asymmetric in that a Digital VAX-11/750 minicomputer was used to compress the video in non-real time to 30.
If You want to learn about the technology, computer science & engineering, web programming, freelancing, earning please click here :CSE SOLVE

No comments:

Post a Comment