AVI

More Knowledge about AVI

Audio Video Interleaved - A multimedia file format for storing sound and moving pictures in RIFF format developed by Microsoft. An AVI file can use different codecs and formats so there is no set format for an AVI file unlike for example standard VCD video which sets a standard for resolution, bitrates, and codecs used.

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 aspect ratio information, with the result that players cannot select the right one automatically (though it may be possible to do so manually).
There are several competing approaches to including a time code in AVI files, which affects usability of the format in film and television postproduction (although it is widely used). For WAV audio files, Broadcast Wave extensions were designed to standardize postproduction metadata, but an equivalent for AVI files has not emerged.
AVI is not intended to contain variable frame rate material. Workarounds for this limitation increase overhead dramatically.
AVI was not intended to contain video using any compression technique which requires access to future video frame data beyond the current frame. Approaches exist to support modern video compression techniques (such as MPEG-4) which rely on this function, although this is beyond the intent of the original specification and may cause problems with playback software which does not anticipate this use. AVI cannot contain some specific types of variable bitrate (VBR) data reliably (such as MP3 audio at sample rates below 32 kHz).
Overhead for AVI files at the resolutions and frame rates normally used to encode standard definition feature films is about 5 MB per hour of video, the significance of which varies with the application.

More recent container formats (such as Matroska, OGG and MP4) solve all these problems, although software is freely available to both create and correctly replay AVI files which use these more recent techniques.

How to Convert DVD to AVI?

Believing it or not, best movie resources are still from your DVD collections. Besides watching movies on TV with DVD player, sometimes you may also want to enjoy the films with iPod, iPad, PSP, or PC players; sometimes you may want to back up a special disc; sometimes you want to upload DVD disc content to YouTube but just find only FLV files are accepted...At this moment, you do need to rip DVD to video in common formats. On the other hand, DVD discs takes some space while converting DVD to videos to store the movies on PC will save your space. Needless to say, backing up DVD disc and making DVD copy are necessary to ensure never losing those important data.

The following guide will tell you exactly how to rip and convert DVD movies to video in desired format, like ripping DVD to AVI/MOV/WMV, step by step.

First, it is necessary to install the software: DVD Converter;
Secondly, you should have a DVD disc in your driver or DVD folder in your PC;
Last, make sure your PC has enough free space in a hard disk for saving temporary files.

Step 1: Add DVD Movie to DVD Converter

Launch DVD Converter. Click button “Open DVD” to open a DVD disc (DVD-5 or DVD-9) in your driver or a DVD folder (containing VOB files) in your PC.

Step 2: Specify DVD to Video/Audio Conversion

After DVD titles are all listed in the program, you may go to General Settings or Advanced Settings panel to specify your conversion. Click the drop down arrow under "Target profile" and select a profile from the list. It lists kinds of DVD to video/audio conversion pre-sets, which are specified different dimension, bit rate, codec, file size and so on.

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Step 3: Rip DVD

Click button "Rip DVD" on the top of the tool bar to start DVD to video/audio conversion.

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