Thats odd, as 413 usually refers to a file that is too big. You could try a different format.

Yes, I think perhaps based on this thread, as I’m happy with core provided, 1:1 PAR might be fine for me:
http://libretro.com/forums/showthread.php?t=1987&p=18368&viewfull=1#post18368

I think a lot of it (for me) comes down to the suitability of the overlay provided, and the scanline application, including opacity etc..

Just about any alteration is so much better than the default look :)