Shooting square (1:1)
Webcams and DSLRs shoot rectangular images (usually 16:9, 3:2 or 4:3). How can you be sure what you are filming will be on screen if you are shooting for Instagram or Vine?
Setting the mask / guidelines aspect ratio
Use the mask option in Eclipse and Eclipse SD (shown here set to on with the green dot) to blank out areas that will not be square (1:1).
Beneath the mask option is the guidelines toggle button. This shows you what you will see when the image is cropped to square, however it also shows you the full frame. Seeing everything can be handy when filming.
For Instagram (May 2015) the video size displayed is 640 x 640.
Therefore, in Eclipse, setup the following from the Menu > Export:
The exported file will be in MP4 format, perfect for emailing to iPhones or Android devices then uploading to Instagram.
The maximum length for Instgram videos is 15 seconds.