Video Toolbox provides a set of tools to do the simple things you want with movies on your Android phone or tablet: rotate, trim, flip, resize, and convert.Try before you buy with the trial/demo version; it's identical except output videos contain a watermark.
http://androidideas.org/videotoolbox/trial/google-play
Supports editing all media formats created by Android camera (camcorder) apps as well as some additional formats.
Input formats: MP4, 3GP, M4V, WebM, MKV, OGV, AVI, MOV
New input formats (beta): FLV, WMV, MPG, ASF
Output formats: MP4, WebM, MKV, AVI, MOV
Please disable task killers; they can interfere with a long rendering process.
Video Toolbox isn't a traditional linear video editor with a timeline, although it allows you to simply edit and convert your videos. It provides a toolkit containing most of the functions that you’d want in a mobile setting, with an interface that makes sense in on a small form factor.
About the tools
Rotator tool:
Turn a video clockwise or counterclockwise by 90, 180, or 270 degrees
Trimmer tool:
Cut a clip out of a film
Resizer tool:
Change the height and width of a video, proportionally if desired
Flipper tool:
Reflect a video horizontally or vertically
Share tool:
Helps you send videos to YouTube, Facebook, Gmail, etc.
Uses FFmpeg, which is licensed under the LGPL. See the "About" page inside the app for more details.
If you have any questions or suggestions please email me at ken@androidideas.org. If you use the comments section for this I can’t really respond or ask questions to clarify.