mythtv nuv to Dvix (unplayable on Dvix TV)

[Reimar.Doeffinger at gmx.de (Reimar Döffinger)]

On Wed, Apr 07, 2010 at 12:43:03AM -0700, Tom Sparks wrote:
> I have a group of myythtv's NUV video (mpg4) files and I want to save them as Dvix files
> 
> I am currently using
> 
> mencoder "input.nuv" -ovc copy -oac mp3lame -vtag DX50 -o "output.avi"

Huh? I only know the -ffourcc option, never heard of -vtag.