[MEncoder-users] Encoding for thinkgeek's mp4 watch

[Sam Varshavchik]

I received a gift of a watch whose small display can play videos. 
thinkgeek.com sells this watch in the US.

Its rather garbled manual claims that the watch can play mp4 or wmv videos. 
I've tried using various mencoder options to generate either mp4 or wmv 
videos, but had no luck -- the watch doesn't play them.

Does anyone have this watch, and can share working options for mencoder to 
generate suitable video? The only hint I have is that the there's a small 
video file that came with a watch, with a .smv extension, and "file" says 
this about it:

baxiesan.smv: RIFF (little-endian) data, WAVE audio, IMA ADPCM, stereo 11025 Hz

I've poured over mencoder's man page and tried various similarly-sounding 
options, but had no luck encoding a file that's identified in the same way, 
by "file". Thanks for any help.