Converting video i have a problem playing my video from my mp4 player when i conver it i cop it 2 my player then it shows no thumbnail? what can i do to watch a movie? and can you help me find a good converter to mp4 format or avi? tnx.............

Firstly, have a check at the file to see whether it is corrupted. Here I found some M4V to MP4 converters, you can use them to convert to other file formats too. What's more, I found a toolkit there, with which you can even remove then DRM restriction. Hope it helps.

https://www.leawo.org/entips/convert-itunes-drm-m4v-to-mp4.html?fixya=1410

You mean a mp4 to avi converter? Refer to this guide and you can know the steps and the tools.

http://www.leawo.com/video/mp4-dvdvideo-converter.html

I would like to share you a best converter i have used:
Video Download Studio
Click here to see the full reviews and have a free trial:
http://www.downloadvideos-convert.com/download-videos-music
It can convert almost any the video format to another with high output quality.
This full-featured video converter software also can help you:
1.convert between all mainstream video and audio formats,such as(mp4, mov, m4v, vob, XviD, avi, flv, 3gp, 3g2, mpg,wmv,etc;m4v, mp3, wav, ac3,etc)
2.extract audio tracks from video files to other audio formats
3.support all popular portable multimedia players
4.edit video-Merge, Trim, Crop and Snapshot
It is very easy to use,just follow the instructions on it you can convert your videos and make your movies and music taken easily on PSP, PS3, iPod, iPhone, Apple TV, Xbox or other digital devices.
Hope this can help you.