new gen_video_thumbnail because of transcode->mplayer switch
[booh] / bin /
drwxr-xr-x   ..
-rw-r--r-- 4894 album2booh
-rwxr-xr-x 196856 booh
-rwxr-xr-x 60156 booh-backend
-rw-r--r-- 60687 booh-classifier
-rw-r--r-- 1021 booh-fix-whitebalance
-rwxr-xr-x 1021 booh-gamma-correction
-rwxr-xr-x 4768 webalbum2booh