The ending AVI identifies audio-video interleave files.
These files can contain multiple video, audio, and text streams (for subtitles). Originally developed by Microsoft for short videos, today the Matrox-enhanced OpenDML version is widely used.
With the ending AVI no statement can be made as to whether a program can display the content or not, since AVI represents a container format. This means that in an AVI file video or audio data can be contained in different compression methods.
AVI format only defines how the data streams are arranged and labeled. However, not all compression methods and combinations are supported. Nevertheless, AVI is the most widely used format for videos on the PC.
For decoding the data streams the player needs additional codecs.
These can be integrated directly into the operating system and used in all corresponding applications or integrated only in the player.
Codecs are available for a variety of video and audio compression methods. Playback programs like VLC can play many formats even without the codec installed.
An AVI file may contain, for example, a Divx encoded video stream and ac3 encoded audio. But there are also other formats to uncompressed data or WMV possible. The included video can be in many resolutions up to HD material.
Most often resolving problems with opening AVI files is very simple. Just install an appropriate program that supports such files. All of the listed programs support AVI files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of AVI files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate AVI files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the QuickTime Player applications is not on the list, select "Browse" option in order to manually locate the directory where QuickTime Player has been installed.
Sometimes problems with opening AVI files may not lie with the application itself, but can arise due to other causes, such as: