This has got to be my own fault...

... And it's making me feel pretty stupid, but I'll ask anyway.

No matter how I format the files and no matter what settings I select in my video converter software (I use Miro on my Macbook Pro... ) I cannot get any video files to work on my Droid 4. I start with avi files and convert them to mp4 files, but no amount of tweaking will get them to play in any of the popular video players on Google Play.

What am I doing wrong, or what do I need to know to do it right?

Many thanks,

UA