SDF Files Downsampling

[Techowl]

How does one go about downsampling the video files from the GD-ROM?

I have the files on my system. I can convert 'em to mpg with sdf2mpg02, then what? I haven't found a util to convert them back to sdf. I tried the Dreamcast Movie maker, but only supports avi files. I tried to convert the mpg to and avi, but the sucker won't play properly after conversion.

On a side note, I would also need to know what apps one gets to downsample the videos.

Any input?

Thanks,

- Tim -