Fail to encode file in web app

[freejool]

It's ok to encode a 2MB file, but when uploading a 30MB file -->

[sz3]

Unfortunately we need a block of contiguous memory, and sometimes the OS/browser doesn't want to do that (sometimes?) when the size is large enough.

Not sure what a good solution is (it'll become more important if/when I'm able to increase the transfer speed)

[freejool]

Figuring out how much is the usual max size and how to increase that restriction may be helpful.

[sz3]

#96, #132 also describe this same problem.

I do think we can do better with memory usage during encoding. I'm not sure how many of these errors it'll solve, but I'm looking into it. (basically: the encoder C api needs to accept the input file in multiple chunks -- we'll still store the compressed file in contiguous memory, but that might be enough to get things under control)