Windows Live Movie Maker support forums are littered with problems with getting users media files in to the program the mesh wwith the application.
Windows Live Movie Maker is a free offering from Microsoft that offers novice and average users the ability to edit video and from there, be able to share/publish it to Facebook, YouTube, eMail, DVD and even custom resolutions. It's a basic editor with very simplified interface, and it's part of the Windows Live Essentials Suite of applications.
Honestly, the application should be able to handle all these formats, considering that they're all considered standard, but there are some exceptions. If Microsoft was smart about it, they'd devote some time to finding, recommending or writing an app that'd find the right codec and loading of the Windows Live Movie Maker users.
Windows Live Movie Maker supports many formats; but what's not provided to the public [regular users] is that Windows Live Movie Maker doesn't recognize those various formats unless the CODEC for that format is installed in the operating system; it's not built-in to Windows Live Movie Maker. And Windows Live Movie Maker doesn't make any attempts to identify or get those codecs for you.
Here are the Photo file types (format) with their extentions for Windows Live Movie Maker.
Joint Photographic Experts Group (JPEG) files
.jpg, .jpeg, .jfif, and .jpe
Tagged Image File Format (TIFF) files
.tif and .tiff
Graphics Interchange Format (GIF) files
Windows Bitmap files
.bmp, .dib, and .rle
.ico and .icon
Portable Network Graphics (PNG) files
HD Photo files
According to the support page for Windows Live Movie Maker 2011; it supports an array of video formats; and those are:
Windows Media Video (WMV) files
» Native to Windows Live Movie Maker 2011 «
Windows Media files
.asf and .wm
.m2ts and .m2t
Apple QuickTime files
.mov and .qt
Microsoft Recorded TV Show files
.dvr-ms and .wtv
MPEG‑4 movie files
.mp4, .mov,.m4v, .3gp, .3g2, and .k3g
MPEG‑2 movie files
.mpeg, .mpg, .mpe, .m1v, .mp2, .mpv2, .mod, and .vob
MPEG‑1 movie files
Motion JPEG files
.avi and .mov
Here are the supported Audio file types (format) with extensions for Windows Live Movie Maker.
Windows Media Audio (WMA) files
.asf, .wm, and .wma
Pulse-code Modulation (PCM) files
.aif, .aiff, and .wav
Advanced Audio Coding (AAC) files
If you're having any issues with audio/video media, one of the first things you need to do is find the right codec to use; and you need a program that can do that for you.
I wrote a post on how to find the codec that's being used and how to find the codec for you and Windows Live Movie Maker.
Windows Live Movie Maker isn't compatible with a lot of the formats it says it's until you load the CODECS in to the operating system. If you're having issues/problems with opening/editing your audio/video media, it could be your installed codecs [or the lack of] or maybe you need to update your CODECS; ultimately, it's all about the CODECS.
Audio and Video, both, require current CODECS to play the proper media [correctly].
As a suggestion, you can download the most ubiquitous CODECS yourself and installing them very easily...It's FREE, REPUTABLE and updated regularly.
Windows Live Movie Maker support:
If you'd like, you can leave feedback for the Windows Live Movie Maker 2011 team for suggestions/improvements:
I hope this helps...
Larry Henry Jr.