legendmani, et al,
Could be several things:
1 What is the original file format? it must be avi, mpeg, or wmv. Rm, rvm Mov, etc will not work.
2 What is the resolution? If it is inncorrect, it may display errors. Check it this way: when playing converted movie in amvplayer, right clik on it and go down to 'property', this will give resolution, etc. Make sure you converted using the proper res. for your player, IE 128x128, or 160x128, etc.
3 uninstall amvtools 4.00. Install ver. 3.68 from downloads. If you have a 1.8" screen, you will need to edit AmvTransform.ini file. Open it in notepad, insert this string in place of existing string:
VIDEOSIZE=128X96(8;10;12),128X128(8;10;12),160x120 (8;10;12) this adds fullscreen resolution for 1.8" player.
4 or it could be ahacked player. Read here :
http://www.mympxplayer.com/viewtopic.php?t=382
Post what worked for you....