Allowing Video Resize During Conversion

This is a feature request that I had in my own use of the module. I wanted to take the user-uploaded video, and shrink it down using a maximum width and maximum height that I needed to be able to specify myself. This helps to keep the video file sizes down in my scenario. I thought I would attempt to contribute it to the module, if others think it would be a good addition to the existing features (fingers crossed).

Patch Features:

• Adds a "Video Maximum Dimensions" textbox to the admin form
• This allows any uploaded videos to be resized to the admin's specifications
• Adds a function "_flashvideo_video_resize"
• This measures the uploaded video's size using an ffmpeg command
• This will add a -s sizing parameter to the ffmpeg command during conversion
• The function uses mathematics to maintain proper aspect ratio of the video during the resize
• Makes a small addition to the $command so that $ffmpeg_data variable is filled in with the result of the command. (I would consider this a bug fix. The "Data:" message seemed to be continuously empty for me in the ffmpeg_data table.)

This patch is for the latest release of FlashVideo (6.x-1.4-rc2).