Manually edit the height and width of a video.
VideoDimensions is a module for Gallery 3 which will allow users to manually edit the height and width of a video that they've uploaded to Gallery. This can be useful for Gallery's that do not have access to FFmpeg and thus cannot automatically determine a video's height and width.
This module may be downloaded from the Gallery forums here.
To install, extract the "videodimensions" folder from the zip file into your Gallery 3 modules folder. Afterwards log into your Gallery web site as an administrator and activate the module in the Admin -> Modules menu. You will then be able to edit the height and width of a video by selecting Edit from the Options menu.