To have one’s visual elements displayed such that the aspect of width appears in proper ratio to that of height is an essential element of the maintenance of sanity in a hurried and harried world.
— Henry David Thoreau
Ok, that’s a fib, Thoreau didn’t say that. But it’s true nonetheless.
The video below has pixel dimensions of 480 × 360, so the the ratio of pixel width to pixel height is 4:3. How does it look?
The next, below, is the very same source, but SWFPut has been set to display it at a 16:9 ratio.
I’d say Thoreau would be pleased, but who knows, maybe he wouldn’t have cared. Do You?
In the “SWFPut Video” metabox form there is a “Dimensions” section with an input field labelled “Display aspect” in which you can place the correct ratio for display. The default is 0 which disables the setting. The value given is horizontal on left, vertical on right, separated by ‘:’ or ‘x’ or ‘-‘ or ‘/’ or ‘ ‘ or it can be one positive real number (distinguished by the presence of a decimal dot, with apologies for lack of internationally adapted notation).
So for example, you may give something like 16:9, or 16/9, or 1.7777777777777777 etc..