AVI
According to Wiki, Audio Video Interleaved (also Audio Video Interleave), known by its initials AVI, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows software.
AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback. Like the DVD video format, AVI files support multiple streaming audio and video, although these features are seldom used. Most AVI files also use the file format extensions developed by the Matrox OpenDML group in February 1996. These files are supported by Microsoft, and are unofficially called “AVI 2.0”.
M4V
The M4V file format is a video container format developed by Apple and is very similar to the MP4 format, which may optionally be protected by DRM copy protection.
Apple uses M4V to encode video files, such as TV episodes, movies, and music videos, in its iTunes Store. The copyright of M4V files may be protected by using Apple’s FairPlay DRM copy protection. To play a protected M4V file, the computer needs to be authorized (using iTunes) with the account that was used to purchase the video.
Steps to Convert iTunes M4V to AVI
M4V Converter Plus is a professional iTunes M4V to AVI converter. With it, you can remove DRM protection from iTunes videos and convert M4V to AVI within few clicks. It can support 30X faster conversion speed with high output quality.
Step 1. Free download M4V Converter Plus on your computer.
Install and launch the program on your PC.
Step 2. Import iTunes M4V videos by clicking Add Movies button. Or you can drag and drop videos to the main interface of the software.
Step 3. Set AVI as output format.
Step 4. Start M4V to AVI conversion.
Main Functions of M4V Converter Plus.
- Convert DRM-ed M4V to any video format, like MP4, AVI, MOV, MPG, 3PG, WMV, FLV.
- Edit the added iTunes videos before converting, including Clip videos, Customize video or audio parameters.
- Directly convert iTunes videos to common devices like galaxy tab as you need.
- Extract audio from protected M4V videos to MP3, AC3, AAC, FLAC, WAV, etc.
- It works well on Windows 10/8/7, Mac OS X 10.8 and later.
iTunes DRM Removal tool & M4V Converter 