1. MP4 stands for mpeg4 format file which is used to store digital sound and movie. MP4 also supports subtitles and Internet streaming. MP4  is a kind of media container like avi, ogm, mkv.

To convert mp4 to avi: please install the appropriate video decoder and audio decoder for the mp4 format such as FFDSHOW.

Install the avi video or audio encoder (DivX, XviD).

Launch Open Video Converter, click the Open Video button, select an mp4  file for mp4 to avi. 

If the conversion failed, please try to use for converting MP4/M4V to AVI.

2. IPod to avi:

The iPod is a popular multimedia player created and marketed by Apple Computer. The video on iPod is saved as mp4 format. Like most digital audio video players, an iPod can serve as an external data storage device when connected to PC. IPod can store photos, music, and videos. The software of the iPod is called iTune, which can play music, rip music from CD, and burn music to CD.

To convert iPod to avi means convert mp4 to avi. We recommend a priority using <> to change MP4/M4V to avi format. Please install mp4 splitter and mp4 decoder on your system until the converter can preview the file, such as the Combined Community Codec Pack (CCCP), or Apple Quicktime player, FFDSHOW, Haali Media Splitter, HDX4 decoder.

If the iPod files are encrypted, the converting iPod to avi will fail.