Maximum possible array, excluding swap file

I'd like to load large video files into memory (in the order of several GBs), preferably all frames in one go. I also want to avoid using the swap file, so before I load the file I want to make sure whether it will fit into RAM (otherwise I will load the data in two or more parts).

How can I determine the maximum possible array size, but without the swap file part? The memory command will only give me that with the swap file included.