Here is how I export video from Media 100 to my PC where I can do things like convert it to MPEG2.

First off, I have a high capacity external SCSI hard drive for Media 100 to put exported QuickTime files on. I use a full frame, high quality codec like MJPEG or just go with Uncompressed. With Mac OS 9.1 the 2gig filesize limit is broken! The short tutorial Alaskan Wildlife commercial comes to around 2.5 gigabytes when exported uncompressed.

Next, you'll need TransMac from Acute Systems Software on your PC. This supports reading HFS and HFS+ formatted removable media and SCSI hard drives, without mucking around with your system like those installable filesystem drivers. (And it won't foul up use of Macintosh emulators like Basilisk II.)

Connect your SCSI drive to your PC. I suggest picking up a plain old Adaptec single bus 2940 PCI controller on eBay. The single bus narrow or ultra models are fine, they have an HD50 external connector. The wide or ultra/wide dual bus versions have the HD68 external connector which will cost you more in cables and adaptors for the Centronics 50 connector your external drive is likely to have. There's no need to invest in a wide SCSI case when it's going to spend most of the time connected to your Mac's DB25 SCSI port.

Now run TransMac and select your SCSI drive on the Mac Drive: list.
Next, doubleclick the volume name your QuickTime files are in.
Click on a file you want to copy (Control-Click to select multiple files. Windows uses Control instead of Shift for this.) and click the Copy button. On the Mac to PC Copy dialog, under File Translation: select Resource File then click OK. If you didn't add the .mov extention while the drive was connected to the Mac, check the Add a filename extention box and TransMac will do it for you.

After the resource files are copied, use Windows Explorer to go to the folder where you put them and change the extentions from .mov to .qtr Now go back to TransMac and do the copy as before except this time select Data File under File Translation:.

QuickTime for Windows will now play the movies, but the .qtr and .mov files for each video must always be in the same folder.

There is a way around this, either before or after you use Transmac to copy the files to the PC. The .mov file has to be "flattened". On the Mac, if you have QuickTime 4.0 or later you can open the video then Save it as a self contained file. There are some flattener applications but they're old and may not work with Mac OS 9.1, or even 8.1. Here are the archive names, hunt them up if you want them. fast-player-110.hqx and flattmoov.sit.hqx There's another one, Unify 1.02, but I can't find it except for links to a directory on info-mac and its mirror sites that has been deleted from all of them. It was in /info-mac/gst/mov/ The mov directory is gone.

To flatten on the PC, after copying both the data and resource forks, there is the freeware QT-Flattener from Logicels & Services Duhem in both Win32 GUI and commandline versions.

OK, now that you have the videos on your PC, what to use to convert them to other formats. Most any program that can open QuickTime should work, but many commercial video applications have annoying "features" like insisting that no matter how much the video is compressed, only 38 minutes of it will fit on a Mini-DVD even if you're using "90 minute" (audio capacity) blanks. The 74 and 80 minute sizes are hard coded into the programs along with the "maximum" time.

The solution is to use a "less commercial" program that's much more flexible, like Tsunami MPEG Encoder. You'll also need the QTReader VFP plugin, which is freeware, to open .mov files with TMPGEnc. Simply unzip the QTReader.vfp file into the folder where the TMPGEnc.exe program file is.

Now Tsunami can open QuickTime files, either flattened or in .mov .qtr file pairs, and convert to any format it supports.

A whole bunch more information on video formats, conversions, editing etc. can be found at the DVDR Help site. (Formerly VCD Help, but still has all the VCD/CVD/SVCD info too.)

Update: I need to find if there are any export settings or possibly a third party plugin that will export video that doesn't have interlace problems like this.
It looks perfectly fine on the TV monitor, in motion or paused, but so far every way I've tried to do a digital export looks like this.