Sometimes mplayer thinks flash .flv videos have way too many frames per seconds, like 1000, so it plays them at breakneck speed.

This script tries to correct for that:

  /usr/local/bin/identify-fps

#!/bin/sh mplayer 2>/dev/null -vo none -ao none -identify "$@" | awk -F= '/^ID_VIDEO_FPS/ { r=$2; if (r>39) print 10; else print r; }'

Usage:

mplayer -fps `identify-fps myvideo.flv` ...other-options... myvideo.flv

Tweaking: The script aboves says if FPS is greater than 39, use 10 instead. That seems to work OK for me. You can adjust the constants.