Common options
List all supported formats
-formats
Use specific format
-f <Format-Name>
Set output size
-s [SIZE-Name]
Where SIZE-Name can be one of the following.
See man page for a full list
sqcif
128x96
qcif
176x144
cif 352x288
4cif
704x576
qqvga
160x120
qvga
320x240
vga 640x480
svga
800x600
xga 1024x768
uxga
1600x1200
qxga
2048x1536
sxga
1280x1024
See also
Convert