dvdstyler, "not valid mpeg-file"

[Marty <martyb@ix.netcom.com>]

I am generating MPEG-2 files in hardware using the WinTV PVR-150 MCE.
About one in 20 files is rejected by dvdstyler as "not valid mpeg-file."
Mythtv and totem have no problems playing the files.  The Mythtv video file 
settings are all default as installed.  Everything on my system is stock sarge 
and debian-multimedia, all up-to-date.

I have tried re-encoding with ffmpeg and mencoder, guessing at various 
parameters, without success.  I am not familiar enough with video in general to 
easily debug this problem.  If I bypass dvdstyler, mpgtx rejects the file.  If I 
then use the mpgtx -X option, forcing mpgtx to search for a valid mpeg header, 
then later on mplex fails.  Any help is appreciated.