Just for reference, I posted this in the other thread:
Code:
#!/bin/sh
./ffmpeg -d -i $1 -an -pix_fmt gray -sws_flags neighbor -f rawvideo -s 800x600 -|./raw2gmv|./gmplay &
./ffmpeg -d -i $1 -vn -f s16le -acodec pcm_s16le -ar 44100 -|aplay -f cd
Note that it has an "&" on one line, so it runs them both in parallel. This is a common method to output both sound and video from ffmpeg.