[Gonçalo Perdigao] “The problem is that i want to convert a composition 1920X1080 wide screen into a 720X576 square render.”
Add your item to the render queue. Choose an output module like “Lossless.”
Click on the name of the output module to open output module settings. Check the “Resize” checkbox and change the width to 720. If “Lock Aspect Ratio” is checked, this will also change the width to 405. (This might pose a problem for interlacing or not. Perhaps you want an even value here?)
Now check the “Crop” box and add some negative crops to the top and bottom to pad out the image. Use -86 on top and -85 on the bottom. Using a negative crop actually adds pad, and this will return the frame size to 720×576, letterboxing your original content.
If you’d rather take a center cut, then set the resize height to 576, reset the top and botton crop to 0, and set the left and right crops to 152 each.
Another option is to use Adobe Media Encoder to output your sequence. Open AME add an Ae composition from the File menu, or drag and drop the comp from Ae into AME. You can then use or create a PAL square pixel preset, with control over how the source sequence is scaled.
Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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