Okay, here's how to create ROTATED FULLSCREEN videos to fit the wierd size of the 8100.

1. Download the latest version of Virtual Dub.
2. Download the latest version of the K-Lite Mega Codec Pack.
3. Run Virtual Dub, and as long as it is an AVI file, you should be able to open it.
4. Add two filters: first, add a rotate filter, 90 degrees left or right.
5. Second filter: resize to the closest division of the actual size to the target size (240x260).

E.g,:

Original video: 640x480, rotated = 480x640. Reduced by 50% = 240x320.

6. In the resize filter properties, crop the image to 240x260, thereby discarding 30 pixels on both sides of the image.

* If you have a widescreen video, you will probably want to reduce it less to keep more of the image.

7. Under Audio, set it to Full Stream processing, and select Lame MP3. Pick a decent stero bitrate.

8. Under Video, set it to full processing mode, go to compression, and pick xvid. Set profile to mobile device, that's all you need.

9. Under file, Save As an AVI file.

Use a fullscreen media player like mediaPlayer or xplayer (mediaPlayer is MUCH better but is trialware) to get a proper fullscreen experience.